https://issues.apache.org/bugzilla/show_bug.cgi?id=45825
Summary: lack of synchronization in ThrowableInformation
Product: Log4j
Version: 1.2
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: major
Priority: P2
Component: Other
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
Log4j version 1.2.15.
Method getThrowableStrRep in org.apache.log4j.spi.ThrowableInformation should
be synchronized in some way. The variable rep can be read by one thread (for
example AsynsAppender) in line 72, while another is in line 91
(lines.toArray(rep)). This may cause rep to contain some nulls. It leads to
NullPointerException at java.io.Writer.write(Writer.java:140). Stacktrace:
java.lang.NullPointerException
at java.io.Writer.write(Writer.java:140)
at org.apache.log4j.helpers.QuietWriter.write(QuietWriter.java:48)
at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:309)
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.info(Category.java:683)
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