diff --git a/src/lwjake2/client/CL.java b/src/lwjake2/client/CL.java
index 8f0afe6..3fabe5d 100644
--- a/src/lwjake2/client/CL.java
+++ b/src/lwjake2/client/CL.java
@@ -112,7 +112,7 @@ public final class CL {
                 int len;
 
                 if (!Globals.cls.demorecording) {
-                    Com.Printf("Not recording a demo.\n");
+                    logger.info("Not recording a demo.");
                     return;
                 }
 
@@ -122,7 +122,7 @@ public final class CL {
                 Globals.cls.demofile.close();
                 Globals.cls.demofile = null;
                 Globals.cls.demorecording = false;
-                Com.Printf("Stopped demo.\n");
+                logger.info("Stopped demo.");
             } catch (IOException e) {
             }
         }
@@ -146,17 +146,17 @@ public final class CL {
                 entity_state_t ent;
 
                 if (Cmd.Argc() != 2) {
-                    Com.Printf("record <demoname>\n");
+                    logger.info("record <demoname>");
                     return;
                 }
 
                 if (Globals.cls.demorecording) {
-                    Com.Printf("Already recording.\n");
+                    logger.info("Already recording.");
                     return;
                 }
 
                 if (Globals.cls.state != Defines.ca_active) {
-                    Com.Printf("You must be in a level to record.\n");
+                    logger.info("You must be in a level to record.");
                     return;
                 }
 
@@ -165,11 +165,11 @@ public final class CL {
                 //
                 name = FS.Gamedir() + "/demos/" + Cmd.Argv(1) + ".dm2";
 
-                Com.Printf("recording to " + name + ".\n");
+                logger.info("recording to {}", name);
                 FS.CreatePath(name);
                 Globals.cls.demofile = new RandomAccessFile(name, "rw");
                 if (Globals.cls.demofile == null) {
-                    Com.Printf("ERROR: couldn't open.\n");
+                    logger.error("ERROR: couldn't open.");
                     return;
                 }
                 Globals.cls.demorecording = true;
@@ -250,7 +250,7 @@ public final class CL {
         public void execute() {
             if (Globals.cls.state != Defines.ca_connected
                     && Globals.cls.state != Defines.ca_active) {
-                Com.Printf("Can't \"" + Cmd.Argv(0) + "\", not connected\n");
+                logger.warn("Can't \"{}\", not connected", Cmd.Argv(0));
                 return;
             }
 
@@ -298,7 +298,7 @@ public final class CL {
             String server;
 
             if (Cmd.Argc() != 2) {
-                Com.Printf("usage: connect <server>\n");
+                logger.info("usage: connect <server>");
                 return;
             }
 
@@ -332,7 +332,7 @@ public final class CL {
         public void execute() {
 
             if (Globals.rcon_client_password.string.length() == 0) {
-                Com.Printf("You must set 'rcon_password' before\nissuing an rcon command.\n");
+                logger.warn("You must set 'rcon_password' before\nissuing an rcon command.");
                 return;
             }
 
@@ -362,7 +362,7 @@ public final class CL {
                 to = Globals.cls.netchan.remote_address;
             else {
                 if (Globals.rcon_address.string.length() == 0) {
-                    Com.Printf("You must either be connected,\nor set the 'rcon_address' cvar\nto issue rcon commands\n");
+                    logger.warn("You must either be connected,\nor set the 'rcon_address' cvar\nto issue rcon commands");
                     return;
                 }
                 NET.StringToAdr(Globals.rcon_address.string, to);
@@ -397,7 +397,7 @@ public final class CL {
             SCR.BeginLoadingPlaque();
             Globals.cls.state = Defines.ca_connected; // not active anymore, but
                                                       // not disconnected
-            Com.Printf("\nChanging map...\n");
+            logger.info("Changing map...");
         }
     };
 
@@ -416,7 +416,7 @@ public final class CL {
 
             S.StopAllSounds();
             if (Globals.cls.state == Defines.ca_connected) {
-                Com.Printf("reconnecting...\n");
+                logger.info("reconnecting...");
                 Globals.cls.state = Defines.ca_connected;
                 MSG.WriteChar(Globals.cls.netchan.message,
                         Defines.clc_stringcmd);
@@ -432,7 +432,7 @@ public final class CL {
                     Globals.cls.connect_time = -99999; // fire immediately
 
                 Globals.cls.state = Defines.ca_connecting;
-                Com.Printf("reconnecting...\n");
+                logger.info("reconnecting...");
             }
         }
     };
@@ -453,7 +453,7 @@ public final class CL {
             NET.Config(true); // allow remote
 
             // send a broadcast packet
-            Com.Printf("pinging broadcast...\n");
+            logger.info("pinging broadcast...");
 
             noudp = Cvar.Get("noudp", "0", Defines.CVAR_NOSET);
             if (noudp.value == 0.0f) {
@@ -482,9 +482,9 @@ public final class CL {
                 if (adrstring == null || adrstring.length() == 0)
                     continue;
 
-                Com.Printf("pinging " + adrstring + "...\n");
+                logger.info("pinging {} ...", adrstring);
                 if (!NET.StringToAdr(adrstring, adr)) {
-                    Com.Printf("Bad address: " + adrstring + "\n");
+                    logger.warn("Bad address: {}", adrstring);
                     continue;
                 }
                 if (adr.port == 0)
@@ -508,9 +508,7 @@ public final class CL {
             for (i = 0; i < Defines.MAX_CLIENTS; i++) {
                 if (Globals.cl.configstrings[Defines.CS_PLAYERSKINS + i] == null)
                     continue;
-                Com.Printf("client " + i + ": "
-                        + Globals.cl.configstrings[Defines.CS_PLAYERSKINS + i]
-                        + "\n");
+                logger.info("client {}: {}", i, Globals.cl.configstrings[Defines.CS_PLAYERSKINS + i]);
                 SCR.UpdateScreen();
                 Sys.SendKeyEvents(); // pump message loop
                 CL_parse.ParseClientinfo(i);
@@ -523,7 +521,7 @@ public final class CL {
      */
     static xcommand_t Userinfo_f = new xcommand_t() {
         public void execute() {
-            Com.Printf("User info settings:\n");
+            logger.info("User info settings:");
             Info.Print(Cvar.Userinfo());
         }
     };
@@ -619,7 +617,7 @@ public final class CL {
         int port;
 
         if (!NET.StringToAdr(Globals.cls.servername, adr)) {
-            Com.Printf("Bad server address\n");
+            logger.warn("Bad server address");
             Globals.cls.connect_time = 0;
             return;
         }
@@ -662,7 +660,7 @@ public final class CL {
             return;
 
         if (!NET.StringToAdr(Globals.cls.servername, adr)) {
-            Com.Printf("Bad server address\n");
+            logger.warn("Bad server address");
             Globals.cls.state = Defines.ca_disconnected;
             return;
         }
@@ -672,7 +670,7 @@ public final class CL {
         // for retransmit requests
         Globals.cls.connect_time = Globals.cls.realtime;
 
-        Com.Printf("Connecting to " + Globals.cls.servername + "...\n");
+        logger.info("Connecting to {}...", Globals.cls.servername);
 
         Netchan.OutOfBandPrint(Defines.NS_CLIENT, adr, "getchallenge\n");
     }
@@ -715,10 +713,11 @@ public final class CL {
 
             time = (int) (Timer.Milliseconds() - Globals.cl.timedemo_start);
             if (time > 0)
-                Com.Printf("%i frames, %3.1f seconds: %3.1f fps\n",
-                        new Vargs(3).add(Globals.cl.timedemo_frames).add(
-                                time / 1000.0).add(
-                                Globals.cl.timedemo_frames * 1000.0 / time));
+                logger.info(String.format("%d frames, %3.1f seconds: %3.1f fps",
+                        Globals.cl.timedemo_frames,
+                        (time / 1000.0f),
+                        (Globals.cl.timedemo_frames * 1000.0f / time)
+                ));
         }
 
         Math3D.VectorClear(Globals.cl.refdef.blend);
@@ -761,7 +760,7 @@ public final class CL {
 
         s = MSG.ReadString(Globals.net_message);
 
-        Com.Printf(s + "\n");
+        logger.info(s);
         Menu.AddToServerList(Globals.net_from, s);
     }
 
@@ -782,13 +781,13 @@ public final class CL {
         Cmd.TokenizeString(s.toCharArray(), false);
 
         c = Cmd.Argv(0);
-        
-        Com.Println(Globals.net_from.toString() + ": " + c);
+
+        logger.info("{}: {}", Globals.net_from.toString(), c);
 
         // server connection
         if (c.equals("client_connect")) {
             if (Globals.cls.state == Defines.ca_connected) {
-                Com.Printf("Dup connect received.  Ignored.\n");
+                logger.info("Dup connect received.  Ignored.");
                 return;
             }
             Netchan.Setup(Defines.NS_CLIENT, Globals.cls.netchan,
@@ -808,7 +807,7 @@ public final class CL {
         // remote command from gui front end
         if (c.equals("cmd")) {
             if (!NET.IsLocalAddress(Globals.net_from)) {
-                Com.Printf("Command packet from remote host.  Ignored.\n");
+                logger.info("Command packet from remote host.  Ignored.");
                 return;
             }
             s = MSG.ReadString(Globals.net_message);
@@ -820,7 +819,7 @@ public final class CL {
         if (c.equals("print")) {
             s = MSG.ReadString(Globals.net_message);
             if (s.length() > 0)
-            	Com.Printf(s);
+                logger.info(s);
             return;
         }
 
@@ -844,7 +843,7 @@ public final class CL {
             return;
         }
 
-        Com.Printf("Unknown command.\n");
+        logger.warn("Unknown command.");
     }
 
 
@@ -872,8 +871,7 @@ public final class CL {
                 continue; // dump it if not connected
 
             if (Globals.net_message.cursize < 8) {
-                Com.Printf(NET.AdrToString(Globals.net_from)
-                        + ": Runt packet\n");
+                logger.info("{}: Runt packet", NET.AdrToString(Globals.net_from));
                 continue;
             }
 
@@ -898,7 +896,7 @@ public final class CL {
                 && Globals.cls.realtime - Globals.cls.netchan.last_received > Globals.cl_timeout.value * 1000) {
             if (++Globals.cl.timeoutcount > 5) // timeoutcount saves debugger
             {
-                Com.Printf("\nServer connection timed out.\n");
+                logger.info("Server connection timed out.");
                 Disconnect();
                 return;
             }
@@ -1417,7 +1415,7 @@ public final class CL {
         path = FS.Gamedir() + "/config.cfg";
         f = Lib.fopen(path, "rw");
         if (f == null) {
-            Com.Printf("Couldn't write config.cfg.\n");
+            logger.warn("Couldn't write config.cfg.");
             return;
         }
         try {
diff --git a/src/lwjake2/client/CL_parse.java b/src/lwjake2/client/CL_parse.java
index 1139346..3b87594 100644
--- a/src/lwjake2/client/CL_parse.java
+++ b/src/lwjake2/client/CL_parse.java
@@ -34,6 +34,8 @@ import lwjake2.render.model_t;
 import lwjake2.sound.S;
 import lwjake2.sys.Sys;
 import lwjake2.util.Lib;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.RandomAccessFile;
@@ -42,6 +44,7 @@ import java.io.RandomAccessFile;
  * CL_parse
  */
 public class CL_parse {
+    private static final Logger logger = LoggerFactory.getLogger(CL_parse.class);
 
     //// cl_parse.c -- parse a message received from the server
 
@@ -715,7 +718,15 @@ public class CL_parse {
                     S.StartLocalSound("misc/talk.wav");
                     Globals.con.ormask = 128;
                 }
-                Com.Printf(MSG.ReadString(Globals.net_message));
+                //TODO потом уброать
+                String msg = MSG.ReadString(Globals.net_message);
+                while (msg.startsWith("\n")) { msg = msg.substring(1); }
+                while (msg.endsWith("\n")) { msg = msg.substring(0, msg.lastIndexOf("\n")); }
+                while (msg.endsWith("\r")) { msg = msg.substring(0, msg.lastIndexOf("\r")); }
+                msg = msg.trim();
+                if (!msg.isEmpty()) {
+                    logger.info(msg);
+                }
                 Globals.con.ormask = 0;
                 break;
 
diff --git a/src/lwjake2/client/Console.java b/src/lwjake2/client/Console.java
index 9c3045e..41a561d 100644
--- a/src/lwjake2/client/Console.java
+++ b/src/lwjake2/client/Console.java
@@ -28,6 +28,8 @@ import lwjake2.qcommon.FS;
 import lwjake2.qcommon.xcommand_t;
 import lwjake2.util.Lib;
 import lwjake2.util.Vargs;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.RandomAccessFile;
@@ -37,7 +39,7 @@ import java.util.Arrays;
  * Console
  */
 public final class Console extends Globals {
-
+    private static final Logger logger = LoggerFactory.getLogger(Console.class);
     public static xcommand_t ToggleConsole_f = new xcommand_t() {
         public void execute() {
             SCR.EndLoadingPlaque(); // get rid of loading plaque
@@ -86,7 +88,8 @@ public final class Console extends Globals {
             String name;
 
             if (Cmd.Argc() != 2) {
-                Com.Printf("usage: condump <filename>\n");
+                logger.info("usage: condump <filename>");
+
                 return;
             }
 
@@ -94,11 +97,11 @@ public final class Console extends Globals {
             // Cmd_Argv(1));
             name = FS.Gamedir() + "/" + Cmd.Argv(1) + ".txt";
 
-            Com.Printf("Dumped console text to " + name + ".\n");
+            logger.info("Dumped console text to {}", name);
             FS.CreatePath(name);
             f = Lib.fopen(name, "rw");
             if (f == null) {
-                Com.Printf("ERROR: couldn't open.\n");
+                logger.error("ERROR: couldn't open.");
                 return;
             }
 
@@ -148,7 +151,7 @@ public final class Console extends Globals {
 
         CheckResize();
 
-        Com.Printf("Console initialized.\n");
+        logger.info("Console initialized.");
 
         //
         // register our commands
diff --git a/src/lwjake2/client/Key.java b/src/lwjake2/client/Key.java
index c387614..ecd9f95 100644
--- a/src/lwjake2/client/Key.java
+++ b/src/lwjake2/client/Key.java
@@ -26,6 +26,8 @@ import lwjake2.qcommon.Com;
 import lwjake2.qcommon.Cvar;
 import lwjake2.qcommon.xcommand_t;
 import lwjake2.util.Lib;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.RandomAccessFile;
@@ -35,6 +37,7 @@ import java.util.Vector;
  * Key
  */
 public class Key extends Globals {
+	private static final Logger logger = LoggerFactory.getLogger(Key.class);
 	//
 	// these are the key numbers that should be passed to Key_Event
 	//
@@ -576,7 +579,7 @@ public class Key extends Globals {
 			
 			Cbuf.AddText("\n");
 		
-			Com.Printf(new String(Globals.key_lines[Globals.edit_line], 0, Lib.strlen(Globals.key_lines[Globals.edit_line])) + "\n");
+			logger.info(new String(Globals.key_lines[Globals.edit_line], 0, Lib.strlen(Globals.key_lines[Globals.edit_line])));
 			Globals.edit_line = (Globals.edit_line + 1) & 31;
 			history_line = Globals.edit_line;
 		
@@ -665,11 +668,16 @@ public class Key extends Globals {
 	}
 
 	private static void printCompletions(String type, Vector<String> compl) {
-		Com.Printf(type);
+		StringBuilder sb = new StringBuilder(compl.size());
 		for (int i = 0; i < compl.size(); i++) {
-			Com.Printf((String)compl.get(i) + " ");
+			sb.append(compl.get(i)).append(' ');
 		}
-		Com.Printf("\n");
+		//TODO потом убрать
+		while (type.startsWith("\n")) { type = type.substring(1); }
+		while (type.endsWith("\n")) { type = type.substring(0, type.lastIndexOf("\n")); }
+		while (type.endsWith("\r")) { type = type.substring(0, type.lastIndexOf("\r")); }
+		type = type.trim();
+		logger.info("{} {}", type, sb.toString());
 	}
 	
 	static void CompleteCommand() {
diff --git a/src/lwjake2/client/SCR.java b/src/lwjake2/client/SCR.java
index ade0da0..a8b1972 100644
--- a/src/lwjake2/client/SCR.java
+++ b/src/lwjake2/client/SCR.java
@@ -33,6 +33,8 @@ import lwjake2.sound.S;
 import lwjake2.sys.Timer;
 import lwjake2.util.Lib;
 import lwjake2.util.Vargs;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.awt.Dimension;
 import java.nio.ByteBuffer;
@@ -43,6 +45,7 @@ import java.util.Arrays;
  * SCR
  */
 public final class SCR extends Globals {
+    private static final Logger logger = LoggerFactory.getLogger(SCR.class);
 
     //	cl_scrn.c -- master for refresh, status bar, console, chat, notify, etc
 
@@ -637,8 +640,7 @@ public final class SCR extends Globals {
 
         stop = Timer.Milliseconds();
         time = (stop - start) / 1000.0f;
-        Com.Printf("%f seconds (%f fps)\n", new Vargs(2).add(time).add(
-                128.0f / time));
+        logger.info(String.format("%f seconds (%f fps)", time, (128.0f / time)));
     }
 
     static void DirtyScreen() {
@@ -1758,8 +1760,7 @@ public final class SCR extends Globals {
             return;
 
         if (frame > cl.cinematicframe + 1) {
-            Com.Println("Dropped frame: " + frame + " > "
-                    + (cl.cinematicframe + 1));
+            logger.info("Dropped frame: {} > {}", frame, (cl.cinematicframe + 1));
             cl.cinematictime = cls.realtime - cl.cinematicframe * 1000 / 14;
         }
         
@@ -1826,7 +1827,7 @@ public final class SCR extends Globals {
             EndLoadingPlaque();
             cls.state = ca_active;
             if (size == 0 || cin.pic == null) {
-                Com.Println(name + " not found.");
+                logger.info("{} not found.", name);
                 cl.cinematictime = 0;
             }
             return;
diff --git a/src/lwjake2/client/V.java b/src/lwjake2/client/V.java
index af5c5ce..ea74f4a 100644
--- a/src/lwjake2/client/V.java
+++ b/src/lwjake2/client/V.java
@@ -27,6 +27,8 @@ import lwjake2.qcommon.xcommand_t;
 import lwjake2.sys.Timer;
 import lwjake2.util.Math3D;
 import lwjake2.util.Vargs;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.nio.FloatBuffer;
@@ -35,6 +37,7 @@ import java.nio.FloatBuffer;
  * V
  */
 public final class V extends Globals {
+    private static final Logger logger = LoggerFactory.getLogger(V.class);
 
     static cvar_t cl_testblend;
 
@@ -360,8 +363,7 @@ public final class V extends Globals {
 
         re.RenderFrame(cl.refdef);
         if (cl_stats.value != 0.0f)
-            Com.Printf("ent:%i  lt:%i  part:%i\n", new Vargs(3).add(
-                    r_numentities).add(r_numdlights).add(r_numparticles));
+            logger.info("ent:{}  lt:{}  part:{}", r_numentities, r_numdlights, r_numparticles);
         if (log_stats.value != 0.0f && (log_stats_file != null))
             try {
                 log_stats_file.write(r_numentities + "," + r_numdlights + ","
@@ -381,10 +383,12 @@ public final class V extends Globals {
      */
     static xcommand_t Viewpos_f = new xcommand_t() {
         public void execute() {
-            Com.Printf("(%i %i %i) : %i\n", new Vargs(4).add(
-                    (int) cl.refdef.vieworg[0]).add((int) cl.refdef.vieworg[1])
-                    .add((int) cl.refdef.vieworg[2]).add(
-                            (int) cl.refdef.viewangles[YAW]));
+            logger.info("({} {} {}) : {}",
+                    (int) cl.refdef.vieworg[0],
+                    (int) cl.refdef.vieworg[1],
+                    (int) cl.refdef.vieworg[2],
+                    (int) cl.refdef.viewangles[YAW]
+            );
         }
     };
 
diff --git a/src/lwjake2/client/VID.java b/src/lwjake2/client/VID.java
index 10da069..61ff5f8 100644
--- a/src/lwjake2/client/VID.java
+++ b/src/lwjake2/client/VID.java
@@ -29,6 +29,8 @@ import lwjake2.render.Renderer;
 import lwjake2.sound.S;
 import lwjake2.sys.IN;
 import lwjake2.util.Vargs;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.awt.Dimension;
 import java.awt.DisplayMode;
@@ -41,6 +43,7 @@ import java.awt.DisplayMode;
  * @author cwei
  */
 public class VID extends Globals {
+	private static final Logger logger = LoggerFactory.getLogger(VID.class);
 	//	   Main windowed and fullscreen graphics interface module. This module
 	//	   is used for both the software and OpenGL rendering versions of the
 	//	   Quake refresh engine.
@@ -75,7 +78,11 @@ public class VID extends Globals {
 	*/
 
 	public static void Printf(int print_level, String fmt) {
-		Printf(print_level, fmt, null);	
+		while (fmt.startsWith("\n")) { fmt = fmt.substring(1); }
+		while (fmt.endsWith("\n")) { fmt = fmt.substring(0, fmt.lastIndexOf("\n")); }
+		while (fmt.endsWith("\r")) { fmt = fmt.substring(0, fmt.lastIndexOf("\r")); }
+		fmt = fmt.trim();
+		logger.warn("{}", fmt);
 	}
 
 	public static void Printf(int print_level, String fmt, Vargs vargs) {
@@ -174,7 +181,8 @@ public class VID extends Globals {
 			FreeReflib();
 		}
 
-		Com.Printf( "------- Loading " + name + " -------\n");
+		logger.info("------- Loading {} -------", name);
+
 		
 		boolean found = false;
 		
@@ -187,11 +195,11 @@ public class VID extends Globals {
 		}
 
 		if (!found) {
-			Com.Printf( "LoadLibrary(\"" + name +"\") failed\n");
+			logger.warn("LoadLibrary(\"{}\") failed", name);
 			return false;
 		}
 
-		Com.Printf( "LoadLibrary(\"" + name +"\")\n" );
+		logger.info("LoadLibrary(\"{}\")", name);
 		Globals.re = Renderer.getDriver(name);
 		
 		if (Globals.re == null)
@@ -217,7 +225,7 @@ public class VID extends Globals {
 		/* Init KBD */
 		Globals.re.getKeyboardHandler().Init();
 
-		Com.Printf( "------------------------------------\n");
+		logger.info("------------------------------------");
 		reflib_active = true;
 		return true;
 	}
@@ -263,10 +271,10 @@ public class VID extends Globals {
 				}
 				if ( vid_ref.string.equals(Renderer.getDefaultName())) {
 				    renderer = vid_ref.string;
-					Com.Printf("Refresh failed\n");
+					logger.info("Refresh failed");
 					gl_mode = Cvar.Get( "gl_mode", "0", 0 );
 					if (gl_mode.value != 0.0f) {
-						Com.Printf("Trying mode 0\n");
+						logger.info("Trying mode 0");
 						Cvar.SetValue("gl_mode", 0);
 						if ( !LoadRefresh( vid_ref.string ) )
 							Com.Error(Defines.ERR_FATAL, "Couldn't fall back to " + renderer +" refresh!");
diff --git a/src/lwjake2/game/Cmd.java b/src/lwjake2/game/Cmd.java
index 07da4f8..259adc2 100644
--- a/src/lwjake2/game/Cmd.java
+++ b/src/lwjake2/game/Cmd.java
@@ -31,6 +31,8 @@ import lwjake2.qcommon.cmd_function_t;
 import lwjake2.qcommon.xcommand_t;
 import lwjake2.server.SV_GAME;
 import lwjake2.util.Lib;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.Arrays;
 import java.util.Comparator;
@@ -40,34 +42,35 @@ import java.util.Vector;
  * Cmd
  */
 public final class Cmd {
+    private static final Logger logger = LoggerFactory.getLogger(Cmd.class);
     static xcommand_t List_f = new xcommand_t() {
         public void execute() {
             cmd_function_t cmd = Cmd.cmd_functions;
             int i = 0;
 
             while (cmd != null) {
-                Com.Printf(cmd.name + '\n');
+                logger.info(cmd.name);
                 i++;
                 cmd = cmd.next;
             }
-            Com.Printf(i + " commands\n");
+            logger.info("{} commands", i);
         }
     };
 
     static xcommand_t Exec_f = new xcommand_t() {
         public void execute() {
             if (Cmd.Argc() != 2) {
-                Com.Printf("exec <filename> : execute a script file\n");
+                logger.info("exec <filename> : execute a script file");
                 return;
             }
 
             byte[] f = null;
             f = FS.LoadFile(Cmd.Argv(1));
             if (f == null) {
-                Com.Printf("couldn't exec " + Cmd.Argv(1) + "\n");
+                logger.info("couldn't exec {}", Cmd.Argv(1));
                 return;
             }
-            Com.Printf("execing " + Cmd.Argv(1) + "\n");
+            logger.info("execing {}", Cmd.Argv(1));
 
             Cbuf.InsertText(new String(f));
 
@@ -77,10 +80,11 @@ public final class Cmd {
 
     static xcommand_t Echo_f = new xcommand_t() {
         public void execute() {
+            StringBuilder sb = new StringBuilder(Cmd.Argc());
             for (int i = 1; i < Cmd.Argc(); i++) {
-                Com.Printf(Cmd.Argv(i) + " ");
+                sb.append(Cmd.Argv(i)).append(' ');
             }
-            Com.Printf("'\n");
+            logger.info(sb.toString());
         }
     };
 
@@ -88,16 +92,16 @@ public final class Cmd {
         public void execute() {
             cmdalias_t a = null;
             if (Cmd.Argc() == 1) {
-                Com.Printf("Current alias commands:\n");
+                logger.info("Current alias commands:");
                 for (a = Globals.cmd_alias; a != null; a = a.next) {
-                    Com.Printf(a.name + " : " + a.value);
+                    logger.info("{} : {}", a.name, a.value);
                 }
                 return;
             }
 
             String s = Cmd.Argv(1);
             if (s.length() > Defines.MAX_ALIAS_NAME) {
-                Com.Printf("Alias name is too long\n");
+                logger.warn("Alias name is too long");
                 return;
             }
 
@@ -191,8 +195,7 @@ public final class Cmd {
         scan = text;
 
         if (len >= Defines.MAX_STRING_CHARS) {
-            Com.Printf("Line exceeded " + Defines.MAX_STRING_CHARS
-                    + " chars, discarded.\n");
+            logger.info("Line exceeded {} chars, discarded.", Defines.MAX_STRING_CHARS);
             return null;
         }
 
@@ -222,8 +225,7 @@ public final class Cmd {
             len += j;
 
             if (len >= Defines.MAX_STRING_CHARS) {
-                Com.Printf("Expanded line exceeded " + Defines.MAX_STRING_CHARS
-                        + " chars, discarded.\n");
+                logger.warn("Expanded line exceeded {} chars, discarded.", Defines.MAX_STRING_CHARS);
                 return null;
             }
 
@@ -235,13 +237,13 @@ public final class Cmd {
             scan = expanded;
             i--;
             if (++count == 100) {
-                Com.Printf("Macro expansion loop, discarded.\n");
+                logger.info("Macro expansion loop, discarded.");
                 return null;
             }
         }
 
         if (inquote) {
-            Com.Printf("Line has unmatched quote, discarded.\n");
+            logger.info("Line has unmatched quote, discarded.");
             return null;
         }
 
@@ -309,17 +311,14 @@ public final class Cmd {
         //Com.DPrintf("Cmd_AddCommand: " + cmd_name + "\n");
         // fail if the command is a variable name
         if ((Cvar.VariableString(cmd_name)).length() > 0) {
-            Com.Printf("Cmd_AddCommand: " + cmd_name
-                    + " already defined as a var\n");
+            logger.warn("Cmd_AddCommand: {} already defined as a var", cmd_name);
             return;
         }
 
         // fail if the command already exists
         for (cmd = cmd_functions; cmd != null; cmd = cmd.next) {
             if (cmd_name.equals(cmd.name)) {
-                Com
-                        .Printf("Cmd_AddCommand: " + cmd_name
-                                + " already defined\n");
+                logger.warn("Cmd_AddCommand: {} already defined", cmd_name);
                 return;
             }
         }
@@ -343,7 +342,7 @@ public final class Cmd {
         while (true) {
 
             if (cmd == null) {
-                Com.Printf("Cmd_RemoveCommand: " + cmd_name + " not added\n");
+                logger.info("Cmd_RemoveCommand: {} not added", cmd_name);
                 return;
             }
             if (0 == Lib.strcmp(cmd_name, cmd.name)) {
@@ -421,7 +420,7 @@ public final class Cmd {
             if (cmd_argv[0].equalsIgnoreCase(a.name)) {
 
                 if (++Globals.alias_count == ALIAS_LOOP_COUNT) {
-                    Com.Printf("ALIAS_LOOP_COUNT\n");
+                    logger.info("ALIAS_LOOP_COUNT");
                     return;
                 }
                 Cbuf.InsertText(a.value);
@@ -1166,7 +1165,7 @@ public final class Cmd {
         cmd = Cmd.Argv(0);
         if (Globals.cls.state <= Defines.ca_connected || cmd.charAt(0) == '-'
                 || cmd.charAt(0) == '+') {
-            Com.Printf("Unknown command \"" + cmd + "\"\n");
+            logger.warn("Unknown command \"{}\"", cmd);
             return;
         }
 
diff --git a/src/lwjake2/game/GameBase.java b/src/lwjake2/game/GameBase.java
index 8afae27..14a596d 100644
--- a/src/lwjake2/game/GameBase.java
+++ b/src/lwjake2/game/GameBase.java
@@ -27,10 +27,13 @@ import lwjake2.server.SV;
 import lwjake2.server.SV_WORLD;
 import lwjake2.util.Lib;
 import lwjake2.util.Math3D;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.StringTokenizer;
 
 public class GameBase {
+    private static final Logger logger = LoggerFactory.getLogger(GameBase.class);
     public static cplane_t dummyplane = new cplane_t();
 
     public static game_locals_t game = new game_locals_t();
@@ -239,7 +242,7 @@ public class GameBase {
         edict_t choice[] = new edict_t[MAXCHOICES];
 
         if (targetname == null) {
-            gi.dprintf("G_PickTarget called with null targetname\n");
+            logger.info("G_PickTarget called with null targetname");
             return null;
         }
 
@@ -252,7 +255,7 @@ public class GameBase {
         }
 
         if (num_choices == 0) {
-            gi.dprintf("G_PickTarget: target " + targetname + " not found\n");
+            logger.info("G_PickTarget: target {} not found", targetname);
             return null;
         }
 
@@ -396,7 +399,7 @@ public class GameBase {
     };
 
     public static void ShutdownGame() {
-        gi.dprintf("==== ShutdownGame ====\n");
+        logger.info("==== ShutdownGame ====");
     }
 
     /**
diff --git a/src/lwjake2/game/GameItems.java b/src/lwjake2/game/GameItems.java
index 45727f4..09077d0 100644
--- a/src/lwjake2/game/GameItems.java
+++ b/src/lwjake2/game/GameItems.java
@@ -23,12 +23,14 @@ import lwjake2.Defines;
 import lwjake2.qcommon.Com;
 import lwjake2.util.Lib;
 import lwjake2.util.Math3D;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.StringTokenizer;
 
 
 public class GameItems {
-
+    private static final Logger logger = LoggerFactory.getLogger(GameItems.class);
     public static gitem_armor_t jacketarmor_info = new gitem_armor_t(25, 50,
     .30f, .00f, Defines.ARMOR_JACKET);
     public static gitem_armor_t combatarmor_info = new gitem_armor_t(50, 100,
@@ -815,7 +817,7 @@ public class GameItems {
             if (it.pickup_name.equalsIgnoreCase(pickup_name))
                 return it;
         }
-        Com.Println("Item not found:" + pickup_name);
+        logger.info("Item not found:{}", pickup_name);
         return null;
     }
 
diff --git a/src/lwjake2/game/GameSave.java b/src/lwjake2/game/GameSave.java
index 375507b..da46d40 100644
--- a/src/lwjake2/game/GameSave.java
+++ b/src/lwjake2/game/GameSave.java
@@ -23,8 +23,11 @@ import lwjake2.Globals;
 import lwjake2.qcommon.Com;
 import lwjake2.util.Lib;
 import lwjake2.util.QuakeFile;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class GameSave {
+    private static final Logger logger = LoggerFactory.getLogger(GameSave.class);
 
     public static void CreateEdicts() {
         GameBase.g_edicts = new edict_t[GameBase.game.maxentities];
@@ -114,7 +117,7 @@ public class GameSave {
      * a new game is started or a save game is loaded. 
      */
     public static void InitGame() {
-        GameBase.gi.dprintf("==== InitGame ====\n");
+        logger.info("==== InitGame ====");
 
         // preload all classes to register the adapters
         for ( int n=0; n < preloadclasslist.length; n++)
diff --git a/src/lwjake2/game/GameSpawn.java b/src/lwjake2/game/GameSpawn.java
index 11019dd..64e0ca9 100644
--- a/src/lwjake2/game/GameSpawn.java
+++ b/src/lwjake2/game/GameSpawn.java
@@ -42,9 +42,11 @@ import lwjake2.game.monsters.M_Supertank;
 import lwjake2.game.monsters.M_Tank;
 import lwjake2.qcommon.Com;
 import lwjake2.util.Lib;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class GameSpawn {
-
+    private static final Logger logger = LoggerFactory.getLogger(GameSpawn.class);
     static EntThinkAdapter SP_item_health = new EntThinkAdapter() {
         public String getID(){ return "SP_item_health"; }
         public boolean think(edict_t ent) {
@@ -352,7 +354,7 @@ public class GameSpawn {
     static void ED_ParseField(String key, String value, edict_t ent) {
 
         if (key.equals("nextmap"))
-            Com.Println("nextmap: " + value);
+            logger.info("nextmap: {}", value);
         if (!GameBase.st.set(key, value))
             if (!ent.setField(key, value))
                 GameBase.gi.dprintf("??? The key [" + key
diff --git a/src/lwjake2/game/player_state_t.java b/src/lwjake2/game/player_state_t.java
index 679d1cd..82fd2e2 100644
--- a/src/lwjake2/game/player_state_t.java
+++ b/src/lwjake2/game/player_state_t.java
@@ -176,25 +176,26 @@ public class player_state_t {
 	}
 
 	/** Prints the player state. */
-	public void dump() {
-		pmove.dump();
-
-		Lib.printv("viewangles", viewangles);
-		Lib.printv("viewoffset", viewoffset);
-		Lib.printv("kick_angles", kick_angles);
-		Lib.printv("gunangles", gunangles);
-		Lib.printv("gunoffset", gunoffset);
-
-		Com.Println("gunindex: " + gunindex);
-		Com.Println("gunframe: " + gunframe);
-
-		Lib.printv("blend", blend);
-
-		Com.Println("fov: " + fov);
-
-		Com.Println("rdflags: " + rdflags);
-
-		for (int n= 0; n < Defines.MAX_STATS; n++)
-			System.out.println("stats[" + n + "]: " + stats[n]);
-	}
+// метод не используется =(
+//	public void dump() {
+//		pmove.dump();
+//
+//		Lib.printv("viewangles", viewangles);
+//		Lib.printv("viewoffset", viewoffset);
+//		Lib.printv("kick_angles", kick_angles);
+//		Lib.printv("gunangles", gunangles);
+//		Lib.printv("gunoffset", gunoffset);
+//
+//		Com.Println("gunindex: " + gunindex);
+//		Com.Println("gunframe: " + gunframe);
+//
+//		Lib.printv("blend", blend);
+//
+//		Com.Println("fov: " + fov);
+//
+//		Com.Println("rdflags: " + rdflags);
+//
+//		for (int n= 0; n < Defines.MAX_STATS; n++)
+//			System.out.println("stats[" + n + "]: " + stats[n]);
+//	}
 }
diff --git a/src/lwjake2/game/pmove_state_t.java b/src/lwjake2/game/pmove_state_t.java
index 7c47866..62f4b64 100644
--- a/src/lwjake2/game/pmove_state_t.java
+++ b/src/lwjake2/game/pmove_state_t.java
@@ -20,11 +20,14 @@ package lwjake2.game;
 
 import lwjake2.qcommon.Com;
 import lwjake2.util.Math3D;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.RandomAccessFile;
 
 public class pmove_state_t {
+	private final Logger logger = LoggerFactory.getLogger(pmove_state_t.class);
 	//	this structure needs to be communicated bit-accurate
 	//	from the server to the client to guarantee that
 	//	prediction stays in sync, so no floats are used.
@@ -129,22 +132,22 @@ public class pmove_state_t {
 	}
 
 	public void dump() {
-		Com.Println("pm_type: " + pm_type);
+		logger.info("pm_type: {}", pm_type);
 
-		Com.Println("origin[0]: " + origin[0]);
-		Com.Println("origin[1]: " + origin[0]);
-		Com.Println("origin[2]: " + origin[0]);
+		logger.info("origin[0]: {}", origin[0]);
+		logger.info("origin[1]: {}", origin[1]);
+		logger.info("origin[2]: {}", origin[2]);
 
-		Com.Println("velocity[0]: " + velocity[0]);
-		Com.Println("velocity[1]: " + velocity[1]);
-		Com.Println("velocity[2]: " + velocity[2]);
+		logger.info("velocity[0]: {}", velocity[0]);
+		logger.info("velocity[1]: {}", velocity[1]);
+		logger.info("velocity[2]: {}", velocity[2]);
 
-		Com.Println("pmflags: " + pm_flags);
-		Com.Println("pmtime: " + pm_time);
-		Com.Println("gravity: " + gravity);
+		logger.info("pmflags: {}", pm_flags);
+		logger.info("pmtime: {}", pm_time);
+		logger.info("gravity: {}", gravity);
 
-		Com.Println("delta-angle[0]: " + delta_angles[0]);
-		Com.Println("delta-angle[1]: " + delta_angles[0]);
-		Com.Println("delta-angle[2]: " + delta_angles[0]);
+		logger.info("delta-angle[0]: {}", delta_angles[0]);
+		logger.info("delta-angle[1]: {}", delta_angles[1]);
+		logger.info("delta-angle[2]: {}", delta_angles[2]);
 	}
 }
\ No newline at end of file
diff --git a/src/lwjake2/qcommon/Cbuf.java b/src/lwjake2/qcommon/Cbuf.java
index cb94049..20bbb4f 100644
--- a/src/lwjake2/qcommon/Cbuf.java
+++ b/src/lwjake2/qcommon/Cbuf.java
@@ -22,12 +22,14 @@ import lwjake2.Defines;
 import lwjake2.Globals;
 import lwjake2.game.Cmd;
 import lwjake2.util.Lib;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Cbuf
  */
 public final class Cbuf {
-
+    private static final Logger logger = LoggerFactory.getLogger(Cbuf.class);
     private static final byte[] line = new byte[1024];
     private static final byte[] tmp = new byte[8192];
 
@@ -135,7 +137,7 @@ public final class Cbuf {
         int l = text.length();
 
         if (Globals.cmd_text.cursize + l >= Globals.cmd_text.maxsize) {
-            Com.Printf("Cbuf_AddText: overflow\n");
+            logger.warn("Cbuf_AddText: overflow");
             return;
         }
         SZ.Write(Globals.cmd_text, Lib.stringToBytes(text), l);
diff --git a/src/lwjake2/qcommon/Com.java b/src/lwjake2/qcommon/Com.java
index ee00dda..ddfa43c 100644
--- a/src/lwjake2/qcommon/Com.java
+++ b/src/lwjake2/qcommon/Com.java
@@ -342,18 +342,6 @@ public final class Com
 	public static void Printf(String fmt, Vargs vargs)
 	{
 		String msg= sprintf(_debugContext + fmt, vargs);
-		if (rd_target != 0)
-		{
-			if ((msg.length() + rd_buffer.length()) > (rd_buffersize - 1))
-			{
-				rd_flusher.rd_flush(rd_target, rd_buffer);
-				rd_buffer.setLength(0);
-			}
-			rd_buffer.append(msg);
-			return;
-		}
-
-		Console.Print(msg);
 
 		// also echo to debugging console
 		while (msg.startsWith("\n")) { msg = msg.substring(1); }
@@ -361,15 +349,10 @@ public final class Com
 		while (msg.endsWith("\r")) { msg = msg.substring(0, msg.lastIndexOf("\r")); }
 		msg = msg.trim();
 		if (!msg.isEmpty()) {
-			logger.info(msg);
+			logger.warn(msg);
 		}
 	}
 
-	public static void Println(String fmt)
-	{
-		Printf(_debugContext + fmt + "\n");
-	}
-
 	public static String sprintf(String fmt, Vargs vargs)
 	{
 		String msg= "";
diff --git a/src/lwjake2/qcommon/FS.java b/src/lwjake2/qcommon/FS.java
index 3a22086..3ba56b3 100644
--- a/src/lwjake2/qcommon/FS.java
+++ b/src/lwjake2/qcommon/FS.java
@@ -23,6 +23,8 @@ import lwjake2.Globals;
 import lwjake2.game.Cmd;
 import lwjake2.game.cvar_t;
 import lwjake2.sys.Sys;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -43,7 +45,7 @@ import java.util.List;
  * @author cwei
  */
 public final class FS extends Globals {
-
+    private static final Logger logger = LoggerFactory.getLogger(FS.class);
     /*
      * ==================================================
      * 
@@ -143,7 +145,7 @@ public final class FS extends Globals {
         if (index > 0) {
             File f = new File(path.substring(0, index));
             if (!f.mkdirs() && !f.isDirectory()) {
-                Com.Printf("can't create path \"" + path + '"' + "\n");
+                logger.warn("can't create path \"{}\"", path);
             }
         }
     }
@@ -581,8 +583,7 @@ public final class FS extends Globals {
         pack.numfiles = numpackfiles;
         pack.files = newfiles;
 
-        Com.Printf("Added packfile " + packfile + " (" + numpackfiles
-                + " files)\n");
+        logger.info("Added packfile {} ({} files)", packfile, numpackfiles);
 
         return pack;
     }
@@ -684,7 +685,7 @@ public final class FS extends Globals {
 
         if (dir.indexOf("..") != -1 || dir.indexOf("/") != -1
                 || dir.indexOf("\\") != -1 || dir.indexOf(":") != -1) {
-            Com.Printf("Gamedir should be a single filename, not a path\n");
+            logger.warn("Gamedir should be a single filename, not a path");
             return;
         }
 
@@ -737,7 +738,7 @@ public final class FS extends Globals {
         filelink_t entry = null;
 
         if (Cmd.Argc() != 3) {
-            Com.Printf("USAGE: link <from> <to>\n");
+            logger.info("USAGE: link <from> <to>");
             return;
         }
 
@@ -805,8 +806,8 @@ public final class FS extends Globals {
             if (tmp != null)
                 tmp.replaceAll("\\\\", "/");
 
-            Com.Printf("Directory of " + findname + '\n');
-            Com.Printf("----\n");
+            logger.info("Directory of {}", findname);
+            logger.info("----");
 
             dirnames = ListFiles(findname, 0, 0);
 
@@ -814,15 +815,13 @@ public final class FS extends Globals {
                 int index = 0;
                 for (int i = 0; i < dirnames.length; i++) {
                     if ((index = dirnames[i].lastIndexOf('/')) > 0) {
-                        Com.Printf(dirnames[i].substring(index + 1, dirnames[i]
-                                .length()) + '\n');
+                        logger.info(dirnames[i].substring(index + 1, dirnames[i].length()));
                     } else {
-                        Com.Printf(dirnames[i] + '\n');
+                        logger.info(dirnames[i]);
                     }
                 }
             }
 
-            Com.Printf("\n");
         }
     }
 
@@ -834,21 +833,20 @@ public final class FS extends Globals {
         searchpath_t s;
         filelink_t link;
 
-        Com.Printf("Current search path:\n");
+        logger.info("Current search path:");
         for (s = fs_searchpaths; s != null; s = s.next) {
             if (s == fs_base_searchpaths)
-                Com.Printf("----------\n");
+                logger.info("----------");
             if (s.pack != null)
-                Com.Printf(s.pack.filename + " (" + s.pack.numfiles
-                        + " files)\n");
+                logger.info("{} ({} files)", s.pack.filename, s.pack.numfiles);
             else
-                Com.Printf(s.filename + '\n');
+                logger.info(s.filename);
         }
 
-        Com.Printf("\nLinks:\n");
+        logger.info("Links:");
         for (Iterator<filelink_t> it = fs_links.iterator(); it.hasNext();) {
             link = it.next();
-            Com.Printf(link.from + " : " + link.to + '\n');
+            logger.info("{} : {}", link.from, link.to);
         }
     }
 
diff --git a/src/lwjake2/qcommon/Qcommon.java b/src/lwjake2/qcommon/Qcommon.java
index a6dd27a..edb3a1b 100644
--- a/src/lwjake2/qcommon/Qcommon.java
+++ b/src/lwjake2/qcommon/Qcommon.java
@@ -28,6 +28,8 @@ import lwjake2.sys.NET;
 import lwjake2.sys.Sys;
 import lwjake2.sys.Timer;
 import lwjake2.util.Vargs;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.FileWriter;
 import java.io.IOException;
@@ -37,7 +39,7 @@ import java.io.IOException;
  * namely initialization, shutdown and frame generation.
  */
 public final class Qcommon extends Globals {
-
+	private static final Logger logger = LoggerFactory.getLogger(Qcommon.class);
 	public static final String BUILDSTRING = "Java " + System.getProperty("java.version");;
 	public static final String CPUSTRING = System.getProperty("os.arch");
 
@@ -122,7 +124,7 @@ public final class Qcommon extends Globals {
 				SCR.EndLoadingPlaque();
 			}
 
-			Com.Printf("====== Quake2 Initialized ======\n\n");
+			logger.info("====== Quake2 Initialized ======");
 
 			// save config when configuration is completed
 			CL.WriteConfiguration();
@@ -184,9 +186,7 @@ public final class Qcommon extends Globals {
 			}
 
 			if (Globals.showtrace.value != 0.0f) {
-				Com.Printf("%4i traces  %4i points\n",
-					new Vargs(2).add(Globals.c_traces)
-								.add(Globals.c_pointcontents));
+				logger.info(String.format("%4d traces  %4d points", Globals.c_traces, Globals.c_pointcontents));
 
 				
 				Globals.c_traces= 0;
@@ -223,8 +223,7 @@ public final class Qcommon extends Globals {
 				sv -= gm;
 				cl -= rf;
 
-				Com.Printf("all:%3i sv:%3i gm:%3i cl:%3i rf:%3i\n",
-					new Vargs(5).add(all).add(sv).add(gm).add(cl).add(rf));
+				logger.info(String.format("all:%3d sv:%3d gm:%3d cl:%3d rf:%3d", all, sv, gm, cl, rf));
 			}
 
 		} catch (longjmpException e) {
diff --git a/src/lwjake2/render/lwjgl/LWJGLBase.java b/src/lwjake2/render/lwjgl/LWJGLBase.java
index a1eec7c..20190da 100644
--- a/src/lwjake2/render/lwjgl/LWJGLBase.java
+++ b/src/lwjake2/render/lwjgl/LWJGLBase.java
@@ -32,6 +32,8 @@ import org.lwjgl.LWJGLException;
 import org.lwjgl.opengl.Display;
 import org.lwjgl.opengl.DisplayMode;
 import org.lwjgl.opengl.GL11;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * LWJGLBase
@@ -39,6 +41,7 @@ import org.lwjgl.opengl.GL11;
  * @author dsanders/cwei
  */
 public abstract class LWJGLBase {
+	private final Logger logger = LoggerFactory.getLogger(LWJGLBase.class);
 	// IMPORTED FUNCTIONS
 	protected DisplayMode oldDisplayMode; 
 
@@ -207,10 +210,8 @@ public abstract class LWJGLBase {
 
 		Dimension newDim = new Dimension();
 
-		VID.Printf(Defines.PRINT_ALL, "Initializing OpenGL display\n");
+		logger.info("Initializing OpenGL display");
 
-		VID.Printf(Defines.PRINT_ALL, "...setting mode " + mode + ":");
-		
 		/*
 		 * fullscreen handling
 		 */
@@ -219,11 +220,11 @@ public abstract class LWJGLBase {
 		}
 
 		if (!VID.GetModeInfo(newDim, mode)) {
-			VID.Printf(Defines.PRINT_ALL, " invalid mode\n");
+			logger.warn("...setting mode {}: invalid mode", mode);
 			return rserr_invalid_mode;
 		}
 
-		VID.Printf(Defines.PRINT_ALL, " " + newDim.width + " " + newDim.height + '\n');
+		logger.info("...setting mode {}: {} {}", mode, newDim.width, newDim.height);
 
 		// destroy the existing window
 		GLimp_Shutdown();
@@ -254,7 +255,7 @@ public abstract class LWJGLBase {
 				return rserr_invalid_fullscreen; 
 			}	
 
-			VID.Printf(Defines.PRINT_ALL, "...setting fullscreen " + getModeString(displayMode) + '\n');
+			logger.info("...setting fullscreen {}", getModeString(displayMode));
 
 		} 
 		else 
diff --git a/src/lwjake2/render/lwjgl/Main.java b/src/lwjake2/render/lwjgl/Main.java
index 9f95b82..a1684a6 100644
--- a/src/lwjake2/render/lwjgl/Main.java
+++ b/src/lwjake2/render/lwjgl/Main.java
@@ -47,6 +47,8 @@ import org.lwjgl.BufferUtils;
 import org.lwjgl.opengl.ARBMultitexture;
 import org.lwjgl.opengl.GL11;
 import org.lwjgl.opengl.GL13;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Main
@@ -54,7 +56,7 @@ import org.lwjgl.opengl.GL13;
  * @author cwei
  */
 public abstract class Main extends Base {
-
+	private final Logger logger = LoggerFactory.getLogger(Main.class);
 	public static int[] d_8to24table = new int[256];
 
 	int c_visible_lightmaps;
@@ -1037,19 +1039,19 @@ public abstract class Main extends Base {
 			if (err == rserr_invalid_fullscreen) {
 				Cvar.SetValue("vid_fullscreen", 0);
 				vid_fullscreen.modified = false;
-				VID.Printf(Defines.PRINT_ALL, "ref_gl::R_SetMode() - fullscreen unavailable in this mode\n");
+				logger.warn("ref_gl::R_SetMode() - fullscreen unavailable in this mode");
 				if ((err = GLimp_SetMode(dim, (int) gl_mode.value, false)) == rserr_ok)
 					return true;
 			}
 			else if (err == rserr_invalid_mode) {
 				Cvar.SetValue("gl_mode", gl_state.prev_mode);
 				gl_mode.modified = false;
-				VID.Printf(Defines.PRINT_ALL, "ref_gl::R_SetMode() - invalid mode\n");
+				logger.warn("ref_gl::R_SetMode() - invalid mode");
 			}
 
 			// try setting it back to something safe
 			if ((err = GLimp_SetMode(dim, gl_state.prev_mode, false)) != rserr_ok) {
-				VID.Printf(Defines.PRINT_ALL, "ref_gl::R_SetMode() - could not revert to safe mode\n");
+				logger.warn("ref_gl::R_SetMode() - could not revert to safe mode");
 				return false;
 			}
 		}
@@ -1070,7 +1072,7 @@ public abstract class Main extends Base {
 			r_turbsin[j] = Warp.SIN[j] * 0.5f;
 		}
 
-		VID.Printf(Defines.PRINT_ALL, "ref_gl version: " + REF_VERSION + '\n');
+		logger.info("ref_gl version: {}", REF_VERSION);
 
 		Draw_GetPalette();
 
@@ -1081,7 +1083,7 @@ public abstract class Main extends Base {
 
 		// create the window and set up the context
 		if (!R_SetMode()) {
-			VID.Printf(Defines.PRINT_ALL, "ref_gl::R_Init() - could not R_SetMode()\n");
+			logger.info("ref_gl::R_Init() - could not R_SetMode()");
 			return false;
 		}
 		return true;
@@ -1097,13 +1099,13 @@ public abstract class Main extends Base {
 		** get our various GL strings
 		*/
 		gl_config.vendor_string = GL11.glGetString(GL11.GL_VENDOR);
-		VID.Printf(Defines.PRINT_ALL, "GL_VENDOR: " + gl_config.vendor_string + '\n');
+		logger.info("GL_VENDOR: {}", gl_config.vendor_string);
 		gl_config.renderer_string = GL11.glGetString(GL11.GL_RENDERER);
-		VID.Printf(Defines.PRINT_ALL, "GL_RENDERER: " + gl_config.renderer_string + '\n');
+		logger.info("GL_RENDERER: {}", gl_config.renderer_string);
 		gl_config.version_string = GL11.glGetString(GL11.GL_VERSION);
-		VID.Printf(Defines.PRINT_ALL, "GL_VERSION: " + gl_config.version_string + '\n');
+		logger.info("GL_VERSION: {}", gl_config.version_string);
 		gl_config.extensions_string = GL11.glGetString(GL11.GL_EXTENSIONS);
-		VID.Printf(Defines.PRINT_ALL, "GL_EXTENSIONS: " + gl_config.extensions_string + '\n');
+		logger.info("GL_EXTENSIONS: {}", gl_config.extensions_string);
 		
 		gl_config.parseOpenGLVersion();
 
@@ -1137,7 +1139,7 @@ public abstract class Main extends Base {
 		if (monolightmap.length() < 2 || monolightmap.charAt(1) != 'F') {
 			if (gl_config.renderer == GL_RENDERER_PERMEDIA2) {
 				Cvar.Set("gl_monolightmap", "A");
-				VID.Printf(Defines.PRINT_ALL, "...using gl_monolightmap 'a'\n");
+				logger.info("...using gl_monolightmap 'a'");
 			}
 			else if ((gl_config.renderer & GL_RENDERER_POWERVR) != 0) {
 				Cvar.Set("gl_monolightmap", "0");
@@ -1172,16 +1174,16 @@ public abstract class Main extends Base {
 		}
 
 		if (gl_config.allow_cds)
-			VID.Printf(Defines.PRINT_ALL, "...allowing CDS\n");
+			logger.info("...allowing CDS");
 		else
-			VID.Printf(Defines.PRINT_ALL, "...disabling CDS\n");
+			logger.info("...disabling CDS");
 
 		/*
 		** grab extensions
 		*/
 		if (gl_config.extensions_string.indexOf("GL_EXT_compiled_vertex_array") >= 0
 			|| gl_config.extensions_string.indexOf("GL_SGI_compiled_vertex_array") >= 0) {
-			VID.Printf(Defines.PRINT_ALL, "...enabling GL_EXT_compiled_vertex_array\n");
+			logger.info("...enabling GL_EXT_compiled_vertex_array");
 			//		 qglLockArraysEXT = ( void * ) qwglGetProcAddress( "glLockArraysEXT" );
 			if (gl_ext_compiled_vertex_array.value != 0.0f)
 				qglLockArraysEXT = true;
@@ -1191,16 +1193,16 @@ public abstract class Main extends Base {
 			//qglUnlockArraysEXT = true;
 		}
 		else {
-			VID.Printf(Defines.PRINT_ALL, "...GL_EXT_compiled_vertex_array not found\n");
+			logger.info("...GL_EXT_compiled_vertex_array not found");
 			qglLockArraysEXT = false;
 		}
 
 		if (gl_config.extensions_string.indexOf("WGL_EXT_swap_control") >= 0) {
 			qwglSwapIntervalEXT = true;
-			VID.Printf(Defines.PRINT_ALL, "...enabling WGL_EXT_swap_control\n");
+			logger.info("...enabling WGL_EXT_swap_control");
 		} else {
 			qwglSwapIntervalEXT = false;
-			VID.Printf(Defines.PRINT_ALL, "...WGL_EXT_swap_control not found\n");
+			logger.info("...WGL_EXT_swap_control not found");
 		}
 
 		if (gl_config.extensions_string.indexOf("GL_EXT_point_parameters") >= 0) {
@@ -1208,14 +1210,14 @@ public abstract class Main extends Base {
 				//			 qglPointParameterfEXT = ( void (APIENTRY *)( GLenum, GLfloat ) ) qwglGetProcAddress( "glPointParameterfEXT" );
 				qglPointParameterfEXT = true;
 				//			 qglPointParameterfvEXT = ( void (APIENTRY *)( GLenum, const GLfloat * ) ) qwglGetProcAddress( "glPointParameterfvEXT" );
-				VID.Printf(Defines.PRINT_ALL, "...using GL_EXT_point_parameters\n");
+				logger.info("...using GL_EXT_point_parameters");
 			}
 			else {
-				VID.Printf(Defines.PRINT_ALL, "...ignoring GL_EXT_point_parameters\n");
+				logger.info("...ignoring GL_EXT_point_parameters");
 			}
 		}
 		else {
-			VID.Printf(Defines.PRINT_ALL, "...GL_EXT_point_parameters not found\n");
+			logger.info("...GL_EXT_point_parameters not found");
 		}
 
 		// #ifdef __linux__
@@ -1242,26 +1244,26 @@ public abstract class Main extends Base {
 			&& gl_config.extensions_string.indexOf("GL_EXT_paletted_texture") >= 0
 			&& gl_config.extensions_string.indexOf("GL_EXT_shared_texture_palette") >= 0) {
 			if (gl_ext_palettedtexture.value != 0.0f) {
-				VID.Printf(Defines.PRINT_ALL, "...using GL_EXT_shared_texture_palette\n");
+				logger.info("...using GL_EXT_shared_texture_palette");
 				qglColorTableEXT = false; // true; TODO jogl bug
 			}
 			else {
-				VID.Printf(Defines.PRINT_ALL, "...ignoring GL_EXT_shared_texture_palette\n");
+				logger.info("...ignoring GL_EXT_shared_texture_palette");
 				qglColorTableEXT = false;
 			}
 		}
 		else {
-			VID.Printf(Defines.PRINT_ALL, "...GL_EXT_shared_texture_palette not found\n");
+			logger.info("...GL_EXT_shared_texture_palette not found");
 		}
 
 		if (gl_config.extensions_string.indexOf("GL_ARB_multitexture") >= 0) {
-			VID.Printf(Defines.PRINT_ALL, "...using GL_ARB_multitexture\n");
+			logger.info("...using GL_ARB_multitexture");
 			qglActiveTextureARB = true;
 			GL_TEXTURE0 = ARBMultitexture.GL_TEXTURE0_ARB;
 			GL_TEXTURE1 = ARBMultitexture.GL_TEXTURE1_ARB;
 		}
 		else {
-			VID.Printf(Defines.PRINT_ALL, "...GL_ARB_multitexture not found\n");
+			logger.info("...GL_ARB_multitexture not found");
 		}
 
 		if (!(qglActiveTextureARB))
diff --git a/src/lwjake2/server/SV_CCMDS.java b/src/lwjake2/server/SV_CCMDS.java
index ebd4712..5946450 100644
--- a/src/lwjake2/server/SV_CCMDS.java
+++ b/src/lwjake2/server/SV_CCMDS.java
@@ -41,6 +41,8 @@ import lwjake2.sys.Sys;
 import lwjake2.util.Lib;
 import lwjake2.util.QuakeFile;
 import lwjake2.util.Vargs;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.FileNotFoundException;
@@ -49,7 +51,7 @@ import java.io.RandomAccessFile;
 import java.util.Calendar;
 
 public class SV_CCMDS {
-
+	private static final Logger logger = LoggerFactory.getLogger(SV_CCMDS.class);
 	/*
 	===============================================================================
 	
@@ -768,45 +770,46 @@ public class SV_CCMDS {
 			Com.Printf("No server running.\n");
 			return;
 		}
-		Com.Printf("map              : " + SV_INIT.sv.name + "\n");
+		logger.info("map              : {}", SV_INIT.sv.name);
 
-		Com.Printf("num score ping name            lastmsg address               qport \n");
-		Com.Printf("--- ----- ---- --------------- ------- --------------------- ------\n");
+		logger.info("num score ping name            lastmsg address               qport ");
+		logger.info("--- ----- ---- --------------- ------- --------------------- ------");
 		for (i = 0; i < SV_MAIN.maxclients.value; i++) {
 			cl = SV_INIT.svs.clients[i];
 			if (0 == cl.state)
 				continue;
 
-			Com.Printf("%3i ", new Vargs().add(i));
-			Com.Printf("%5i ", new Vargs().add(cl.edict.client.ps.stats[Defines.STAT_FRAGS]));
+			StringBuilder sb = new StringBuilder();
+			sb.append(String.format("%3d ", i))
+			  .append(String.format("%5d ", cl.edict.client.ps.stats[Defines.STAT_FRAGS]));
 
 			if (cl.state == Defines.cs_connected)
-				Com.Printf("CNCT ");
+				sb.append("CNCT ");
 			else if (cl.state == Defines.cs_zombie)
-				Com.Printf("ZMBI ");
+				sb.append("ZMBI ");
 			else {
 				ping = cl.ping < 9999 ? cl.ping : 9999;
-				Com.Printf("%4i ", new Vargs().add(ping));
+				sb.append(String.format("%4d ", ping));
 			}
 
-			Com.Printf("%s", new Vargs().add(cl.name));
+			sb.append(cl.name);
 			l = 16 - cl.name.length();
 			for (j = 0; j < l; j++)
-				Com.Printf(" ");
+				sb.append(' ');
 
-			Com.Printf("%7i ", new Vargs().add(SV_INIT.svs.realtime - cl.lastmessage));
+			sb.append(String.format("%7d ", (SV_INIT.svs.realtime - cl.lastmessage)));
 
 			s = NET.AdrToString(cl.netchan.remote_address);
-			Com.Printf(s);
+			sb.append(s);
 			l = 22 - s.length();
 			for (j = 0; j < l; j++)
-				Com.Printf(" ");
+				sb.append(' ');
 
-			Com.Printf("%5i", new Vargs().add(cl.netchan.qport));
+			sb.append(String.format("%5d", cl.netchan.qport));
 
-			Com.Printf("\n");
+			logger.info(sb.toString());
 		}
-		Com.Printf("\n");
+		logger.info("");
 	}
 	/*
 	==================
diff --git a/src/lwjake2/server/SV_INIT.java b/src/lwjake2/server/SV_INIT.java
index d2f96b9..5e52bf3 100644
--- a/src/lwjake2/server/SV_INIT.java
+++ b/src/lwjake2/server/SV_INIT.java
@@ -38,11 +38,14 @@ import lwjake2.qcommon.SZ;
 import lwjake2.sys.NET;
 import lwjake2.util.Lib;
 import lwjake2.util.Math3D;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.RandomAccessFile;
 
 public class SV_INIT {
+    private static final Logger logger = LoggerFactory.getLogger(SV_INIT.class);
 
     /**
      * SV_FindIndex.
@@ -185,7 +188,7 @@ public class SV_INIT {
         if (attractloop)
             Cvar.Set("paused", "0");
 
-        Com.Printf("------- Server Initialization -------\n");
+        logger.info("------- Server Initialization -------");
 
         Com.DPrintf("SpawnServer: " + server + "\n");
         if (sv.demofile != null)
@@ -320,7 +323,7 @@ public class SV_INIT {
 
         if (Cvar.VariableValue("coop") != 0
                 && Cvar.VariableValue("deathmatch") != 0) {
-            Com.Printf("Deathmatch and Coop both set, disabling Coop\n");
+            logger.info("Deathmatch and Coop both set, disabling Coop");
             Cvar.FullSet("coop", "0", Defines.CVAR_SERVERINFO
                     | Defines.CVAR_LATCH);
         }
diff --git a/src/lwjake2/server/SV_MAIN.java b/src/lwjake2/server/SV_MAIN.java
index c712666..aec7344 100644
--- a/src/lwjake2/server/SV_MAIN.java
+++ b/src/lwjake2/server/SV_MAIN.java
@@ -36,10 +36,13 @@ import lwjake2.qcommon.netadr_t;
 import lwjake2.sys.NET;
 import lwjake2.sys.Timer;
 import lwjake2.util.Lib;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 
 public class SV_MAIN {
+    private static final Logger logger = LoggerFactory.getLogger(SV_MAIN.class);
 
 	/** Address of group servers. */ 
     public static netadr_t master_adr[] = new netadr_t[Defines.MAX_MASTERS];
diff --git a/src/lwjake2/sound/S.java b/src/lwjake2/sound/S.java
index deac602..bd38079 100644
--- a/src/lwjake2/sound/S.java
+++ b/src/lwjake2/sound/S.java
@@ -22,6 +22,8 @@ import lwjake2.Defines;
 import lwjake2.game.cvar_t;
 import lwjake2.qcommon.Com;
 import lwjake2.qcommon.Cvar;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.nio.ByteBuffer;
 import java.util.Vector;
@@ -30,7 +32,7 @@ import java.util.Vector;
  * S
  */
 public class S {
-	
+	private static final Logger logger = LoggerFactory.getLogger(S.class);
 	static Sound impl;
 	static cvar_t s_impl;
 	
@@ -93,11 +95,11 @@ public class S {
 	 */
 	public static void Init() {
 		
-		Com.Printf("\n------- sound initialization -------\n");
+		logger.info("------- sound initialization -------");
 
 		cvar_t cv = Cvar.Get("s_initsound", "1", 0);
 		if (cv.value == 0.0f) {
-			Com.Printf("not initializing.\n");
+			logger.info("not initializing.");
 			useDriver("dummy");
 			return;			
 		}
@@ -119,7 +121,7 @@ public class S {
 			useDriver("dummy");
 		}
 		
-		Com.Printf("\n------- use sound driver \"" + impl.getName() + "\" -------\n");
+		logger.info("------- use sound driver \"{}\" -------", impl.getName());
 		StopAllSounds();
 	}
 	
diff --git a/src/lwjake2/sound/WaveLoader.java b/src/lwjake2/sound/WaveLoader.java
index 00740a8..a05e86b 100644
--- a/src/lwjake2/sound/WaveLoader.java
+++ b/src/lwjake2/sound/WaveLoader.java
@@ -21,11 +21,14 @@ package lwjake2.sound;
 import lwjake2.Defines;
 import lwjake2.qcommon.Com;
 import lwjake2.qcommon.FS;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * SND_MEM
  */
 public class WaveLoader {
+	private static final Logger logger = LoggerFactory.getLogger(WaveLoader.class);
 
 	/** 
 	 * The ResampleSfx can squeeze and stretch samples to a default sample rate. 
@@ -227,7 +230,7 @@ public class WaveLoader {
 				return;
 			}
 			if (iff_chunk_len > 1024*1024) {
-				Com.Println(" Warning: FindNextChunk: length is past the 1 meg sanity limit");
+				logger.warn("Warning: FindNextChunk: length is past the 1 meg sanity limit");
 			}
 			data_p -= 8;
 			last_chunk = data_p + 8 + ((iff_chunk_len + 1) & ~1);
diff --git a/src/lwjake2/sound/lwjgl/LWJGLSoundImpl.java b/src/lwjake2/sound/lwjgl/LWJGLSoundImpl.java
index bf35c4f..a69ed8e 100644
--- a/src/lwjake2/sound/lwjgl/LWJGLSoundImpl.java
+++ b/src/lwjake2/sound/lwjgl/LWJGLSoundImpl.java
@@ -49,6 +49,8 @@ import org.lwjgl.openal.AL10;
 import org.lwjgl.openal.ALC10;
 import org.lwjgl.openal.EFX10;
 import org.lwjgl.openal.OpenALException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * LWJGLSoundImpl
@@ -56,6 +58,7 @@ import org.lwjgl.openal.OpenALException;
  * @author dsanders/cwei
  */
 public final class LWJGLSoundImpl implements Sound {
+	private final Logger logger = LoggerFactory.getLogger(LWJGLSoundImpl.class);
 	
 	static {
 		S.register(new LWJGLSoundImpl());
@@ -85,7 +88,7 @@ public final class LWJGLSoundImpl implements Sound {
 			checkError();
 			initOpenALExtensions();
 		} catch (OpenALException e) {
-			Com.Printf(e.getMessage() + '\n');
+			logger.error(e.getMessage());
 			return false;
 		} catch (Exception e) {
 			Com.DPrintf(e.getMessage() + '\n');
@@ -96,7 +99,7 @@ public final class LWJGLSoundImpl implements Sound {
 		s_volume = Cvar.Get("s_volume", "0.7", Defines.CVAR_ARCHIVE);
 		AL10.alGenBuffers(buffers);
 		int count = Channel.init(buffers);
-		Com.Printf("... using " + count + " channels\n");
+		logger.info("... using {} channels", count);
 		AL10.alDistanceModel(AL10.AL_INVERSE_DISTANCE_CLAMPED);
 		Cmd.AddCommand("play", new xcommand_t() {
 			public void execute() {
@@ -121,10 +124,10 @@ public final class LWJGLSoundImpl implements Sound {
 
 		num_sfx = 0;
 
-		Com.Printf("sound sampling rate: 44100Hz\n");
+		logger.info("sound sampling rate: 44100Hz");
 
 		StopAllSounds();
-		Com.Printf("------------------------------------\n");
+		logger.info("------------------------------------");
 		return true;
 	}
 	
@@ -141,7 +144,7 @@ public final class LWJGLSoundImpl implements Sound {
 		
 		String defaultSpecifier = ALC10.alcGetString(AL.getDevice(), ALC10.ALC_DEFAULT_DEVICE_SPECIFIER);
 
-		Com.Printf(os + " using " + ((deviceName == null) ? defaultSpecifier : deviceName) + '\n');
+		logger.info("{} using {}", os, ((deviceName == null) ? defaultSpecifier : deviceName));
 
 		// Check for an error.
 		if (ALC10.alcGetError(AL.getDevice()) != ALC10.ALC_NO_ERROR) 
@@ -153,7 +156,7 @@ public final class LWJGLSoundImpl implements Sound {
 	/** Initializes OpenAL EFX effects. */
 	private void initOpenALExtensions() 
 	{
-		Com.Printf("... using EFX effects:\n");
+		logger.info("... using EFX effects:");
 		underwaterFilter = new EFXFilterLowPass();
 		underwaterFilter.setGain(1.0f);
 		underwaterFilter.setGainHF(0.0f);
@@ -586,27 +589,26 @@ public final class LWJGLSoundImpl implements Sound {
 			if (sc != null) {
 				size = sc.length * sc.width * (sc.stereo + 1);
 				total += size;
-				if (sc.loopstart >= 0)
-					Com.Printf("L");
-				else
-					Com.Printf(" ");
-				Com.Printf("(%2db) %6i : %s\n", new Vargs(3).add(sc.width * 8).add(size).add(sfx.name));
+				logger.info(String.format("%s(%2db) %6d : %s",
+						(sc.loopstart >= 0 ? 'L' : ' '),
+						(sc.width * 8), size, sfx.name)
+				);
 			} else {
 				if (sfx.name.charAt(0) == '*')
-					Com.Printf("  placeholder : " + sfx.name + "\n");
+					logger.info("  placeholder : {}", sfx.name);
 				else
-					Com.Printf("  not loaded  : " + sfx.name + "\n");
+					logger.info("  not loaded : {}", sfx.name);
 			}
 		}
-		Com.Printf("Total resident: " + total + "\n");
+		logger.info("Total resident: {}", total);
 	}
 	
 	void SoundInfo_f() {
-
-		Com.Printf("%5d stereo\n", new Vargs(1).add(1));
-		Com.Printf("%5d samples\n", new Vargs(1).add(22050));
-		Com.Printf("%5d samplebits\n", new Vargs(1).add(16));
-		Com.Printf("%5d speed\n", new Vargs(1).add(44100));
+		//TODO параметры тут не нужны, сплошная статика
+		logger.info(String.format("%5d stereo", 1));
+		logger.info(String.format("%5d samples", 22050));
+		logger.info(String.format("%5d samplebits", 16));
+		logger.info(String.format("%5d speed", 44100));
 	}
 
 }
diff --git a/src/lwjake2/sys/NET.java b/src/lwjake2/sys/NET.java
index 6b02b34..ccde642 100644
--- a/src/lwjake2/sys/NET.java
+++ b/src/lwjake2/sys/NET.java
@@ -26,6 +26,8 @@ import lwjake2.qcommon.Cvar;
 import lwjake2.qcommon.netadr_t;
 import lwjake2.qcommon.sizebuf_t;
 import lwjake2.util.Lib;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.net.DatagramSocket;
@@ -36,7 +38,7 @@ import java.nio.ByteBuffer;
 import java.nio.channels.DatagramChannel;
 
 public final class NET {
-
+    private static final Logger logger = LoggerFactory.getLogger(NET.class);
     private final static int MAX_LOOPBACK = 4;
 
     /** Local loopback adress. */
@@ -136,7 +138,7 @@ public final class NET {
                 a.port = Lib.atoi(address[1]);
             return true;
         } catch (Exception e) {
-            Com.Println(e.getMessage());
+            logger.error(e.getMessage());
             return false;
         }
     }
@@ -227,7 +229,7 @@ public final class NET {
             int packetLength = receiveBuffer.position();
 
             if (packetLength > net_message.maxsize) {
-                Com.Println("Oversize packet from " + AdrToString(net_from));
+                logger.info("Oversize packet from {}", AdrToString(net_from));
                 return false;
             }
 
@@ -265,7 +267,7 @@ public final class NET {
             SocketAddress dstSocket = new InetSocketAddress(to.getInetAddress(), to.port);
             ip_channels[sock].send(ByteBuffer.wrap(data, 0, length), dstSocket);
         } catch (Exception e) {
-            Com.Println("NET_SendPacket ERROR: " + e + " to " + AdrToString(to));
+            logger.error(String.format("NET_SendPacket: %s to %s", e.getMessage(), AdrToString(to)), e);
         }
     }
 
@@ -345,7 +347,7 @@ public final class NET {
             // the socket have to be broadcastable
             newsocket.setBroadcast(true);
         } catch (Exception e) {
-            Com.Println("Error: " + e.toString());
+            logger.error(String.format("Error: %s", e.getMessage()), e);
             newsocket = null;
         }
         return newsocket;
diff --git a/src/lwjake2/sys/Timer.java b/src/lwjake2/sys/Timer.java
index b8825c8..0cd0789 100644
--- a/src/lwjake2/sys/Timer.java
+++ b/src/lwjake2/sys/Timer.java
@@ -20,8 +20,11 @@ package lwjake2.sys;
 
 import lwjake2.Globals;
 import lwjake2.qcommon.Com;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public abstract class Timer {
+	private static final Logger logger = LoggerFactory.getLogger(Timer.class);
 
 	abstract public long currentTimeMillis();
 	
@@ -33,7 +36,7 @@ public abstract class Timer {
 		} catch (Throwable e) {
 			t = new StandardTimer();
 		}
-		Com.Println("using " + t.getClass().getName());
+		logger.info("using {}", t.getClass().getName());
 	}
 	
 	public static int Milliseconds() {
diff --git a/src/lwjake2/util/Lib.java b/src/lwjake2/util/Lib.java
index e99d287..1bae800 100644
--- a/src/lwjake2/util/Lib.java
+++ b/src/lwjake2/util/Lib.java
@@ -21,6 +21,8 @@ package lwjake2.util;
 import lwjake2.Globals;
 import lwjake2.qcommon.Com;
 import lwjake2.qcommon.FS;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.IOException;
@@ -32,7 +34,7 @@ import java.nio.FloatBuffer;
 import java.nio.IntBuffer;
 
 public class Lib {
-
+	private static final Logger logger = LoggerFactory.getLogger(Lib.class);
 
 	/** Converts a vector to a string. */
 	public static String vtos(float[] v) {
@@ -197,7 +199,7 @@ public class Lib {
 	/** Prints a vector to the quake console. */
 	public static void printv(String in, float arr[]) {
 		for (int n = 0; n < arr.length; n++) {
-			Com.Println(in + "[" + n + "]: " + arr[n]);
+			logger.info("{}[{}]: {}", in, n, arr[n]);
 		}
 	}