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| how can i debug java node |
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| reachguna |
 Posted: Fri Oct 11, 2002 7:55 am Post subject: how can i debug java node |
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Newbie
Joined: 10 Oct 2002
Posts: 5
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Hi ,
How can i debug the java node deployed into the broker?
Anybody has thoughts how to do?
Thanks,
Chandra |
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| marko |
| Posted: Fri Oct 11, 2002 8:43 am Post subject: |
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Apprentice
Joined: 28 Feb 2002
Posts: 27
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| Tracing to a log file has worked well for me. |
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| reachguna |
| Posted: Fri Oct 11, 2002 9:13 am Post subject: |
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Newbie
Joined: 10 Oct 2002
Posts: 5
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Hi,
Thanks for your reply. Can you explain with more details.
Regds,
Chandra. |
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| marko |
| Posted: Fri Oct 11, 2002 11:25 am Post subject: |
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Apprentice
Joined: 28 Feb 2002
Posts: 27
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Basically append to a file on your local filesystem, then print trace statements to the file. You can then examine the file to see what happened in your plugin.
I have not tried it, but it may also be possible to configure WMQI so that you can attach a remote debugger to your code. But personally I prefer tracing, especially as a post-mortum mechanism to analyse a failure in a running system (like your production system).
Here is some code that may help.
| Code: |
if ( msg == null )
{
throw new NullPointerException( "Trace message is null.'" );
}
if ( traceFile == null )
{
traceFile = new FileOutputStream( "trace.log", true );
}
// reset the traceByteBuffer.
traceByteBuffer.reset();
// maximize buffering.
final boolean autoFlush = false;
PrintWriter msgWriter = new PrintWriter( traceByteBuffer, autoFlush );
msgWriter.println( "some header text..." );
msgWriter.println( msg );
msgWriter.println( "some footer text..." );
msgWriter.flush();
msgWriter.close();
//
// if tracing is performed in parallel to the same trace file,
// which can occur with multiple flow instances or exec groups,
// then we need to flush the trace entry atomically to avoid interleaving of
// seperate log entries.
traceByteBuffer.writeTo( traceFile );
traceFile.flush();
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| mmarq |
| Posted: Fri Oct 11, 2002 12:50 pm Post subject: how to debug a java node |
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Acolyte
Joined: 19 Sep 2002
Posts: 74
Location: Newton, MA
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Hi there,
In the new "Developing Solutions in Websphere MQ Integrator" redbook - it talks about the use of JDB which is a java debugger that comes w/Java.
You can reference the document for Java Debugging here:
www.ibm.com/developerWorks.
Chapt 7 - Section 7.5.2 of the redbook I mentioned above goes through an example of how to debug a node using jdb.
Good luck!
Melissa
_________________
M Marquis |
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| lillo |
| Posted: Sat Oct 12, 2002 4:35 am Post subject: |
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Master
Joined: 11 Sep 2001
Posts: 224
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Also chapter 7 will show you how to debug java nodes using WebSphere Application Developer.
Cheers,
_________________
Lillo
IBM Certified Specialist - WebSphere MQ |
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