Hi,

I have a situation where the same line of code in some cases produces a stack trace and in other cases does not.  I have not been able to reproduce this in a unit test.  Has anyone ever seen this?

I’m using this pattern:  <pattern>%date{yyyy-MM-dd HH:mm:ss.SSS} %-6camlevel [%thread] %class.%method:%line - %message %mdc%n</pattern>

Here’s the offending line of code - 581:

logger.warn(

              MessageFormatter.format("Rejecting {} due to error: ", object)

                  .getMessage(), exc);

“object” is an Object and “exc” is an Exception

Example w/o stack trace:

2012-06-06 04:10:25.616 WARN   [DiameterEnfManager8] msc.rc.diameter.DiameterEnfManager.handleObject:581 - Rejecting CREATE SessionId=seagull_gx;atcaa;b;c;d Subscriber=[IMSI:xxxxxxxx, IP:yyyyyyyyyy] due to error:

java.lang.NullPointerException: null

Example w/ stack trace:

2012-06-06 04:14:18.727 WARN   [DiameterEnfManager2] msc.rc.diameter.DiameterEnfManager.handleObject:581 - Rejecting REAUTHACK SessionId=seagull_gxx;atca Subscriber=[IP:aaaaa, IMSI:zzzzzzzzzzzzzzzzz] due to error:

java.util.ConcurrentModificationException: null

        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:819) ~[na:1.7.0_02]

        at java.util.ArrayList$Itr.next(ArrayList.java:791) ~[na:1.7.0_02]

        at msc.rc.model.ObjectFactory.getSessionAltKeys(ObjectFactory.java:4024) ~[msc.jar:na]

        at msc.rc.diameter.model.DiameterObjectFactory.saveSession(DiameterObjectFactory.java:752) ~[msc.jar:na]

        at msc.rc.diameter.DiameterManager.saveSession(DiameterManager.java:595) ~[msc.jar:na]

        at msc.rc.diameter.DiameterManager.handleAck(DiameterManager.java:732) ~[msc.jar:na]

        at msc.rc.diameter.DiameterEnfManager.handleAck(DiameterEnfManager.java:3854) ~[msc.jar:na]

        at msc.rc.diameter.DiameterEnfManager.handleObject(DiameterEnfManager.java:527) ~[msc.jar:na]

        at msc.rc.framework.HandlerThreadTracker.handleObject(HandlerThreadTracker.java:51) [msc.jar:na]

        at msc.rc.framework.QueueHandlerThread.run(QueueHandlerThread.java:103) [msc.jar:na]

        at abc.util.thread.ManagedThread$ExceptionHandler.run(ManagedThread.java:230) [camiant-platform.jar:na]

        at java.lang.Thread.run(Thread.java:722) [na:1.7.0_02]

Thanks,

Dave