Java: WebSocket server won't send data to client properly - websocket

Question

Handshakes are done correctly and the server can decode the data coming from the client, but the client closes the connection when I try to send data to it.
I've been using http://websocket.org/echo.html as the client w. latest versions of Firefox & Chrome.
Here's the data frame I'm trying to send:
129 10000001
4 100
116 1110100
101 1100101
115 1110011
116 1110100
-------
fin:true
opcode:1
len:4
masked:false
masks:[0, 0, 0, 0]
payload:test
?♦test
http://tools.ietf.org/html/rfc6455#section-5
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-------+-+-------------+-------------------------------+
|F|R|R|R| opcode|M| Payload len | Extended payload length |
|I|S|S|S| (4) |A| (7) | (16/64) |
|N|V|V|V| |S| | (if payload len==126/127) |
| |1|2|3| |K| | |
+-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
| Extended payload length continued, if payload len == 127 |
+ - - - - - - - - - - - - - - - +-------------------------------+
| |Masking-key, if MASK set to 1 |
+-------------------------------+-------------------------------+
| Masking-key (continued) | Payload Data |
+-------------------------------- - - - - - - - - - - - - - - - +
: Payload Data continued ... :
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
| Payload Data continued ... |
+---------------------------------------------------------------+
*/
And the server side method responsible for sending data to the client:
public void sendData(Socket socket, byte[] dataBytes){
System.out.println(java.util.Arrays.toString(dataBytes));
//[-127, 4, 116, 101, 115, 116]
for(byte b:dataBytes) System.out.println(Integer.toString((int)0xff&b,2));
/*
10000001
100
1110100
1100101
1110011
1110100
*/
try{
InputStream data = new ByteArrayInputStream(dataBytes);
OutputStream out = socket.getOutputStream();
//tested with ByteArrayOutputStream and written data == dataBytes
//out.write((byte)0x00); //tried with and without this
if ( data != null )
{
// tried also out.write(dataBytes) intstead of this
byte[] buff = new byte[2048];
while (true)
{
int read = data.read( buff, 0, 2048 );
if (read <= 0)
break;
out.write( buff, 0, read );
}
}
//out.write(-1);
//out.write((byte)0xFF);
out.flush();
//out.close();
if ( data != null )
data.close();
}catch(Exception e){
e.printStackTrace();
sockets.remove(socket);
}
}

Answer 1

Some questions:
Do you wait for the connection to open fully before sending from the server?
Can you capture the stream using wireshark and see what's actually on the wire?
In Chrome's Javascript console do you see any WebSocket related errors?
In your onclose handler for the Javascript websocket object, can you console.log the values of code and reason from the event?
Like this:
ws.onclose = function (e) {
console.log("closed - code " + e.code + ", reason " + reason);
}

Answer 2

Your issue was (probably) using the old protocol. Use the newer one...
#see
http://web-sockets.org
Has working source for a client and server (in Java).