DO NOT REPLY [Bug 33278] New: - NPE thrown durring daily log file rollover

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http://issues.apache.org/bugzilla/show_bug.cgi?id=33278

           Summary: NPE thrown durring daily log file rollover
           Product: Log4j
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: minor
          Priority: P4
         Component: Appender
        AssignedTo: log4j-dev@logging.apache.org
        ReportedBy: ken.corbin@hp.com


This a very sporadic event.  This is the first time I've seen in an 
application that has had 9 instances running for a bit over a year.  My guess 
is that you WriteAppender.subappend() should be synchronized, as setWriter 
already is.

27 Jan 2005 00:00:11,407 [ERROR] cvsosfab1-2:Error processing message { 
LOT_ID="LFE451914" DATE_ENTERED_OPER="20050126" TIME_ENTERED_OPER="230156" 
TRANSACTION_DATE="20050127" TRANSACTION_TIME="10" DATE="20050127" TIME="10" 
PRIORITY="0" OWNER="ENGR" LAST_OWNER="ENGR" PRODUCT="GFNEZ03B34A" 
LAST_PRODUCT="GFNEZ03B34A" ROUTE="VA140PH1" LAST_ROUTE="VA140PH1" 
OPERATION="1220" LAST_OPERATION="1220" RETICLE="NA" TRANSACTION="MVIN" 
FACILITY="WCW" LAST_FACILITY="WCW" USER="GREGJF" DELETED_FLAG="N" } --- 
com.hp.messaging.MessageProcessor 
java.lang.NullPointerException	at org.apache.log4j.WriterAppender.subAppend
(WriterAppender.java:292)	
at org.apache.log4j.DailyRollingFileAppender.subAppend 
DailyRollingFileAppender.java:349)	
at org.apache.log4j.WriterAppender.append(WriterAppender.java:150)	
at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221)
at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders
(AppenderAttachableImpl.java:57)	
at org.apache.log4j.Category.callAppenders(Category.java:187)	
at org.apache.log4j.Category.forcedLog(Category.java:372)	
at org.apache.log4j.Category.info(Category.java:674)	
at com.hp.cv.hplogger.Logger.info(Logger.java:242)	
at com.hp.countserver.server.LotCountMgr$WorkstreamListener.onLotChangeEvent
(LotCountMgr.java:235)	
at com.hp.dbquerysupt.BaseDBQueryImpl$LotChangeEventListenerList.notifyListener
(BaseDBQueryImpl.java:170)	
at com.hp.cv.util.ListenerList.fireEvent(ListenerList.java:107)	
at com.hp.dbquerysupt.BaseDBQueryImpl.fireLotChangeEvent
(BaseDBQueryImpl.java:210)	
at com.hp.dbquerysupt.DBQueryImpl$LotChangeSubscriber.messageReceived
(DBQueryImpl.java:776)	
at com.hp.messaging.MessageProcessor.run(MessageProcessor.java:35)	
at com.hp.threadpool.PooledThread.run(PooledThread.java:50)

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