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From "Matteo Candaten (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DIRMINA-832) NullPointerException logged by ExceptionMonitor while invoking a NioSocketConnector.connect() that fails
Date Wed, 27 Apr 2011 10:48:03 GMT
NullPointerException logged by ExceptionMonitor while invoking a NioSocketConnector.connect()
that fails

                 Key: DIRMINA-832
                 URL: https://issues.apache.org/jira/browse/DIRMINA-832
             Project: MINA
          Issue Type: Bug
          Components: Core
    Affects Versions: 2.0.3
            Reporter: Matteo Candaten

A NullPointerException is logged by the ExceptionMonitor while invoking NioSocketConnector.connect(SocketAddress
This occurs in a failure scenario where the connect fails (the connectFuture eventually returns
a "java.net.ConnectException: Connection refused" exception). 
This is the stack trace:

WARN  27Apr 19:01:33.761 [thread-0] DefaultExceptionMonitor Unexpected exception.
	at org.apache.mina.transport.socket.nio.NioSocketConnector.close(NioSocketConnector.java:218)
	at org.apache.mina.transport.socket.nio.NioSocketConnector.close(NioSocketConnector.java:48)
	at org.apache.mina.core.polling.AbstractPollingIoConnector.connect0(AbstractPollingIoConnector.java:335)
	at org.apache.mina.core.service.AbstractIoConnector.connect(AbstractIoConnector.java:262)
	at org.apache.mina.core.service.AbstractIoConnector.connect(AbstractIoConnector.java:172)

the AbstractPollingIoConnector invokes the close(handle) method following the connection failure,
and the implementation of that method in NioSocketConnector throws a NullPointerException
on line 218:

210    @Override
211    protected void close(SocketChannel handle) throws Exception {
212        SelectionKey key = handle.keyFor(selector);
214        if (key != null) {
215            key.cancel();
216        }
218        IoSession session = (IoSession)key.attach(null);
219        IoFilterChain filterChain = session.getFilterChain(); 
220        filterChain.fireSessionClosed();
222        handle.close();
223    }

I think lines 218-220 were added in version 2.0.3. I suspect the fix is to move them inside
the if (key != null) { } block above. 

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