[logback-user] stack trace does not print - sometimes

[Marshall Pierce]

The JVM can omit stack traces if the exception is thrown frequently. See http://stackoverflow.com/questions/4659151/recurring-exception-without-a-stack-trace-how-to-reset and the penultimate bullet point in http://java.sun.com/j2se/1.5.0/relnotes.html#hotspot for more info.

-Marshall

On 2012 Jun 6, at 12:19 PM, David Tkaczyk wrote:

> 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
>  
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