重置WebSocket

Question

I'm writing program that communicates through web sockets and sends serialized objects. I have problem in situation, when connection between server and client is lost. I get this exception:

java.net.SocketException: Connection reset by peer: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
at java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1877)
at java.io.ObjectOutputStream$BlockDataOutputStream.setBlockDataMode(ObjectOutputStream.java:1786)
at java.io.ObjectOutputStream.writeNonProxyDesc(ObjectOutputStream.java:1286)
at java.io.ObjectOutputStream.writeClassDesc(ObjectOutputStream.java:1231)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1427)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at java.io.ObjectOutputStream.writeFatalException(ObjectOutputStream.java:1577)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:351)
at common.WebSocketServer.sendResponse(WebSocketServer.java:103)
at common.WebSocketServer.listen(WebSocketServer.java:86)
at common.WebSocketServer.main(WebSocketServer.java:50)

When I use method socket.isConnected() to check, if server should abandon this client, it returns true (why?), even after closing socket and opening again it is still opened. What should I do?

Answer 1

There are several possible causes but the most common are that you had written to a connection that had already been closed by the peer, or that the peer closed the connection while it still had pending data to read. Both being application protocol errors.

Socket.isConnected() tells you about the state of the socket. Not of the connection.