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From Juha Laiho <Juha.La...@iki.fi>
Subject Re: bizarre NPE exception
Date Fri, 13 Nov 2009 21:48:34 GMT
Looks like the error has more to do with your Log4j configuration than 
the code doing the logging. Looks like some date pattern conversion
is encountering an unexpected null.
-- 
..Juha

Pat Farrell wrote:
> I've got a WorkingSetCache daemon implementation that works great. But
> every so often, when the server is not doing anything, I get what looks
> like a spurious NPE stackdump from Log4J.
> 
> It makes no sense, I can't figure out what the problem is.
> 
> In my class, I have code:
> 
>     } catch (RuntimeException e) {
>         if (pboLogger != null && e != null)
> 				pboLogger.error("factory error", e);
>     }
> 
> which triggers the error. Seems pretty clear to me that my null tests
> are making sure that my code is not the problem.
> 
> Anybody got a clue what I'm doing wrong?
> I'll put the whole stacktrace below
> 
> pat
> 
> log4j:ERROR Error occured while converting date.
> java.lang.NullPointerException
>         at java.lang.System.arraycopy(Native Method)
>         at
> java.lang.AbstractStringBuilder.getChars(AbstractStringBuilder.java:328)
>         at java.lang.StringBuffer.getChars(StringBuffer.java:201)
>         at
> org.apache.log4j.helpers.AbsoluteTimeDateFormat.format(AbsoluteTimeDateFormat.java:119)
>         at java.text.DateFormat.format(DateFormat.java:316)
>         at
> org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(PatternParser.java:444)
>         at
> org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:65)
>         at org.apache.log4j.PatternLayout.format(PatternLayout.java:502)
>         at
> org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:302)
>         at org.apache.log4j.WriterAppender.append(WriterAppender.java:160)
>         at
> org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
>         at
> org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)
>         at org.apache.log4j.Category.callAppenders(Category.java:206)
>         at org.apache.log4j.Category.forcedLog(Category.java:391)
>         at org.apache.log4j.Category.error(Category.java:322)
>         at
> com.pfarrell.busobj.PersistentBusinessObject.factoryFromQueryString(PersistentBusinessObject.java:163)
>         at
> com.pfarrell.utils.collections.DatabaseCache.processAll(DatabaseCache.java:124)
>         at
> com.pfarrell.utils.collections.WorkingSetCache.run(WorkingSetCache.java:145)
>         at java.lang.Thread.run(Thread.java:619)


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