diff --git a/SingleServer/pom.xml b/SingleServer/pom.xml
index 8a956b8..c0936d8 100644
--- a/SingleServer/pom.xml
+++ b/SingleServer/pom.xml
@@ -20,7 +20,7 @@
 
     <groupId>asys</groupId>
     <artifactId>singleserver</artifactId>
-    <version>0.1</version>
+    <version>0.2</version>
     <packaging>bundle</packaging>
 
     <dependencies>
diff --git a/SingleServer/src/main/java/asys/singleserver/Commands.java b/SingleServer/src/main/java/asys/singleserver/Commands.java
index 9593c55..022205b 100644
--- a/SingleServer/src/main/java/asys/singleserver/Commands.java
+++ b/SingleServer/src/main/java/asys/singleserver/Commands.java
@@ -19,10 +19,15 @@ public class Commands {
         this.serverManager = serverManager;
     }
 
+    private void log(String format, Object... objects) {
+        System.out.printf(format+"\n", objects);
+    }
+
     @Command
     @Descriptor("Server start")
     public void start() {
         serverManager.getServer().start();
+        log("Server start");
     }
 
     @Command
@@ -30,13 +35,15 @@ public class Commands {
     public void stop() {
         serverManager.getServer().stop();
         serverManager.removeServer();
+        log("Server stop");
     }
 
     @Command
     @Descriptor("Server force stop")
-    public void forceStop() {
+    public void kill() {
         serverManager.getServer().forceStop();
         serverManager.removeServer();
+        log("Server kill");
     }
 
     @Command
@@ -45,13 +52,18 @@ public class Commands {
         MinecraftServer server = serverManager.getServer();
         server.stop();
         server.start();
+        log("Server restart");
     }
 
     @Command
     @Descriptor("Server is alive?")
-    public void isAlive() {
-        boolean alive = serverManager.getServer().isAlive();
-        System.out.println(String.format("Server is alive: %s", alive));
+    public void alive() {
+        boolean alive = false;
+
+        MinecraftServer server = serverManager.getServer();
+        if (server != null) alive = server.isAlive();
+
+        log("Server alive: %s", alive);
     }
 
     @Command
diff --git a/SingleServer/src/main/java/asys/singleserver/SingleServer.java b/SingleServer/src/main/java/asys/singleserver/SingleServer.java
index 4f29a5a..9fb5b90 100644
--- a/SingleServer/src/main/java/asys/singleserver/SingleServer.java
+++ b/SingleServer/src/main/java/asys/singleserver/SingleServer.java
@@ -15,9 +15,7 @@ import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Properties;
 
-public class SingleServer
-        implements ServerManager
-{
+public class SingleServer implements ServerManager {
     private MinecraftServer mcServer;
     private Properties configuration;
 
diff --git a/SingleServer/src/main/java/asys/singleserver/mcserver/MinecraftScreenServer.java b/SingleServer/src/main/java/asys/singleserver/mcserver/MinecraftScreenServer.java
index f190be8..c8e7d97 100644
--- a/SingleServer/src/main/java/asys/singleserver/mcserver/MinecraftScreenServer.java
+++ b/SingleServer/src/main/java/asys/singleserver/mcserver/MinecraftScreenServer.java
@@ -84,16 +84,19 @@ public class MinecraftScreenServer implements MinecraftServer {
     }
 
     public boolean isAlive() {
+        if (serverPID == null) return false;
+
         try {
-            Process process = Runtime.getRuntime().exec("ps -p " + this.serverPID);
+            Process process = Runtime.getRuntime().exec("ps -p " + serverPID);
             BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
             br.readLine();
             String line = br.readLine();
             br.close();
             return line != null;
         } catch (Exception e) {
-            e.printStackTrace(); }
-        return false;
+            e.printStackTrace();
+            return false;
+        }
     }
 }