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A Java event based WebSocket and HTTP server
There is a newer version: 0.4.15
package org.webbitserver.netty;

import org.jboss.netty.buffer.ChannelBuffer;
import org.webbitserver.WebSocketHandler;
import org.webbitserver.helpers.UTF8Output;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executor;

public class DecodingHybiFrame {

    private final int opcode;
    private final UTF8Output utf8Output;

    private List fragments = new ArrayList();
    private int length;

    public DecodingHybiFrame(int opcode, UTF8Output utf8Output, ChannelBuffer fragment) {
        this.opcode = opcode;
        this.utf8Output = utf8Output;
        append(fragment);
    }

    public void append(ChannelBuffer fragment) {
        fragments.add(fragment);
        length += fragment.readableBytes();
        if (opcode == Opcodes.OPCODE_TEXT) {
            utf8Output.write(fragment.array());
        }
    }

    private byte[] messageBytes() {
        byte[] result = new byte[length];
        int offset = 0;
        for (ChannelBuffer fragment : fragments) {
            byte[] array = fragment.array();
            System.arraycopy(array, 0, result, offset, array.length);
            offset += array.length;
        }
        return result;
    }

    public void dispatchMessage(final WebSocketHandler handler, final NettyWebSocketConnection connection, Executor executor, Thread.UncaughtExceptionHandler exceptionHandler) {
        switch (opcode) {
            case Opcodes.OPCODE_TEXT: {
                final String messageValue = utf8Output.getStringAndRecycle();
                executor.execute(new CatchingRunnable(exceptionHandler) {
                    @Override
                    protected void go() throws Throwable {
                        handler.onMessage(connection, messageValue);
                    }
                });
                return;
            }
            case Opcodes.OPCODE_BINARY: {
                final byte[] bytes = messageBytes();
                executor.execute(new CatchingRunnable(exceptionHandler) {
                    @Override
                    public void go() throws Throwable {
                        handler.onMessage(connection, bytes);
                    }
                });
                return;
            }
            case Opcodes.OPCODE_PONG: {
                final String pongValue = utf8Output.getStringAndRecycle();
                executor.execute(new CatchingRunnable(exceptionHandler) {
                    @Override
                    protected void go() throws Throwable {
                        handler.onPong(connection, pongValue);
                    }
                });
                return;
            }
            default:
                throw new IllegalStateException("Unexpected opcode:" + opcode);
        }
    }


    private abstract class CatchingRunnable implements Runnable {
        private final Thread.UncaughtExceptionHandler exceptionHandler;

        public CatchingRunnable(Thread.UncaughtExceptionHandler exceptionHandler) {
            this.exceptionHandler = exceptionHandler;
        }

        @Override
        public void run() {
            try {
                go();
            } catch (Throwable t) {
                exceptionHandler.uncaughtException(Thread.currentThread(), t);
            }
        }

        protected abstract void go() throws Throwable;
    }
}