Exception in thread "VmPipeIdleStatusChecker" when using Serial Connector

[Fernando C. de Castro]

Hi people,

   Sorry if this was addressed before. This is my first take on the new Serial 
Transport, and I decided to adapt the good old NetCat Example as a first 
attempt. These were my steps:

1) downloaded mina-core-2.0.0-M1-20070822.130904-57.jar from the trunk;

2) started a new project using that Mina 2.0 snapshot with the NetCat Example 
files taken from the website;

3) Made the necessary adjustments on the code (as the API changed a bit from 
1.x) and put the example to work. Worked fine as expected;

4) Downloaded the rxtx pack and installed the DLL (I'm coding on WindowsXP).

5) Changed Main.java to use a SerialConnector instead of a SocketConnector, 
following instructions on the Serial Tutorial.

6) Run the program. 

   And this is what I get:



Native lib Version = RXTX-2.1-7pre20
Java lib Version   = RXTX-2.1-7
WARNING:  RXTX Version mismatch
        Jar version = RXTX-2.1-7
        native lib Version = RXTX-2.1-7pre20
Experimental:  JNI_OnLoad called.

Exception in thread "VmPipeIdleStatusChecker" java.lang.NullPointerException
        at 
org.apache.mina.common.IdleStatusChecker.notifyIdleSession(IdleStatusChecker.java:86)
        at 
org.apache.mina.common.IdleStatusChecker.access$200(IdleStatusChecker.java:33)
        at 
org.apache.mina.common.IdleStatusChecker$Worker.run(IdleStatusChecker.java:77)


   Apparently there is a version mismatch with RXTX, but I haven't been able to 
identify why. Any hints on how to sort that out will surely help. Plus, there 
is the Exception above. I ignored it at first because the program was "cat'ing" 
whatever text was sent to the serial port, as expected, with either Socket or 
Serial.

   But then I noticed: sessionIdle() was never called when I used a 
SerialConnector (and the exception is thrown). When I use the SocketConnector, 
no Exception is thrown and sessionIdle() is called appropriately.

   My Main.java is as follows:


public class Main {
    public static void main(String[] args) throws Exception {

        
        System.out.println(RXTXVersion.getVersion());
        
        IoConnector connector = new SerialConnector();
        connector.setHandler( new NetCatProtocolHandler() );
        connector.setConnectTimeout(10);
        
        SerialAddress portAddress=new SerialAddress( "COM3", 9600, 8, 
SerialAddress.StopBits.BITS_1, SerialAddress.Parity.NONE, 
SerialAddress.FlowControl.NONE );

    
        ConnectFuture future = connector.connect( portAddress );
        future.await();
        IoSession session = future.getSession();
        

    }
}

   The NetCatProtocolHandler() used is as follows:



public class NetCatProtocolHandler extends IoHandlerAdapter {
    public void sessionOpened(IoSession session) {
        // Set reader idle time to 10 seconds.
        // sessionIdle(...) method will be invoked when no data is read
        // for 10 seconds.
        session.getConfig().setIdleTime(IdleStatus.READER_IDLE, 10);
    }

    public void sessionClosed(IoSession session) {
        // Print out total number of bytes read from the remote peer.
        System.err.println("Total " + session.getReadBytes() + " byte(s)");
    }

    public void sessionIdle(IoSession session, IdleStatus status) {
        // Close the connection if reader is idle.
        if (status == IdleStatus.READER_IDLE)
            session.close();
    }

    public void messageReceived(IoSession session, Object message) {
        ByteBuffer buf = (ByteBuffer) message;
        // Print out read buffer content.
        while (buf.hasRemaining()) {
            System.out.print((char) buf.get());
        }
        System.out.flush();
    }

   
}


   Any ideas on what could be throwing the exception and probably hindering 
sessionIdle() from being called when using the SerialConnector?


   Thanks in advance.


Fernando