simple server

src/main/java/mc/core/Main.java

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+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2018-03-25
+ */
+package mc.core;
+
+import lombok.extern.slf4j.Slf4j;
+import mc.core.netty.NettyServer;
+
+@Slf4j
+public class Main {
+    public static void main(String[] args) {
+        log.info("Start server");
+        Server server = new NettyServer();
+        try {
+            server.start("127.0.0.1", 25565);
+        } catch (StartServerException e) {
+            log.error("Starting server error", e);
+            server.stop();
+        }
+    }
+}

src/main/java/mc/core/Server.java

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+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2018-03-25
+ */
+package mc.core;
+
+public interface Server {
+    void start(String host, int port) throws StartServerException;
+    void stop();
+    boolean isRunning();
+}

src/main/java/mc/core/StartServerException.java

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+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2018-03-25
+ */
+package mc.core;
+
+public class StartServerException extends Exception {
+    public StartServerException(Throwable cause) {
+        super(cause);
+    }
+}

src/main/java/mc/core/netty/NettyServer.java

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+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2018-03-25
+ */
+package mc.core.netty;
+
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.ChannelInitializer;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.nio.NioEventLoopGroup;
+import io.netty.channel.socket.SocketChannel;
+import io.netty.channel.socket.nio.NioServerSocketChannel;
+import io.netty.handler.logging.LoggingHandler;
+import mc.core.Server;
+import mc.core.StartServerException;
+
+public class NettyServer implements Server {
+    private EventLoopGroup bossGroup, workerGroup;
+
+    private ChannelInitializer buildChannelInitializer() {
+        return new ChannelInitializer<SocketChannel>() {
+            @Override
+            protected void initChannel(SocketChannel socketChannel) {
+                socketChannel.pipeline().addLast(
+                        new LoggingHandler()
+                );
+            }
+        };
+    }
+
+    private ServerBootstrap buildServerBootstrap() {
+        ServerBootstrap bootstrap = new ServerBootstrap();
+
+        bootstrap.group(bossGroup, workerGroup)
+                .channel(NioServerSocketChannel.class)
+                .childHandler(buildChannelInitializer());
+
+        return bootstrap;
+    }
+
+    @Override
+    public void start(String host, int port) throws StartServerException {
+        bossGroup = new NioEventLoopGroup(1);
+        workerGroup = new NioEventLoopGroup();
+
+        ServerBootstrap serverBootstrap = buildServerBootstrap();
+
+        try {
+            serverBootstrap.bind(host, port).sync().channel().closeFuture().sync();
+        } catch (InterruptedException e) {
+            throw new StartServerException(e);
+        }
+    }
+
+    @Override
+    public void stop() {
+        workerGroup.shutdownGracefully();
+        bossGroup.shutdownGracefully();
+    }
+
+    @Override
+    public boolean isRunning() {
+        return bossGroup != null
+                && workerGroup != null
+                && !(bossGroup.isShutdown() && workerGroup.isShutdown());
+    }
+}

src/main/resources/log4j2.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration>
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%-5level] \{%20.20c\:%-4L} %msg%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="trace">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>