Again: help with Java program

I have the latest stable VM (1.4.2_05) already as I thought that was the problem. Nothing is solved :(

Quote:

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Originally posted here by el-half
I have commented out the code that may cause trouble.
[...]
But it's strange, while there is no exception anymore when I remove actionPerformed's content the exception thrown has nothing to do with IO...

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How about a catch block that reads:

Code:

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try {
  blahblah...;
} catch (Exception e) {
  System.out.println("Exception Thrown: "+ e.getClass().getName() +");
  System.out.println("Message: "+ e.getMessage());
}

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Should help you understand which exception is being thrown.

Thanks, I now found out a NullPointer exception is thrown, so something is wrong with the IO stuff after all. I think.
/me is unable to fix it.

NullPointerException is probably being thrown by that DataConnect class. I'd help, but DataConnect isn't a part of the Java API. I'd assume reading the third party docs for it might help you a bit.

DataConnect is a class I wrote:

Code:

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class DataConnect {    //class for transfer of image
       
        Socket socket = null;
        BufferedInputStream buffer = null;
        DataInputStream data_reader = null;
        String address = "192.168.1.3";
        int PORTNUM;
       
        public DataConnect(int port) {
            PORTNUM = port;
    }
   
    void establishConnection() {
           
            try {
                    socket = new Socket(address, PORTNUM);
                    buffer = new BufferedInputStream(socket.getInputStream());
                    data_reader = new DataInputStream(buffer);
        } catch (IOException e) {
                System.err.println("Exception: " + e.getMessage());
                System.exit(1);
        }
    }
}

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The exception should give you line numbers, so you should be able to figure out what line in which file is generating the exception. You might also try something like:

Code:

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try {
  i=0;
  while ((image[i++] = dataconn.data_reader.readByte()) != -1) {
        // Read data in while it's not EOS
  }
} catch (Exception e) {
  System.out.println("Exception Thrown: "+ e.getClass().getName() +");
  System.err.println("Exception: " + e.getMessage());
}

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