Facing badly with "java.lang.OutOfMemoryError: Java heap space" issue on JBoss Application server

Time Taken :109:
2012-02-03 05:17:45,695 INFO  [STDOUT] <Fri Feb 03 05:17:45 EST 2012> <Debug> <SPT> SessionBeanRemover.valueUnbound(), removed stateful ejb.
2012-02-03 05:17:47,412 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT> WarrantyExpirationTask.emailSalesProcessing(), ended.
2012-02-03 05:17:47,412 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT> WarrantyExpirationTask.removeFileServerFiles(), started.
2012-02-03 05:17:47,563 INFO  [STDOUT] <Feb 3, 2012 5:17:47 AM EST> <Error> <SOT> <000000> <WarrantyExpirationTask.removeFileServerFiles() java.lang.NullPointerException> 
2012-02-03 05:17:47,564 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT> WarrantyExpirationTask.runSOMInterface(), started.
2012-02-03 05:17:47,564 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT> WarrantyExpirationTask.AllowSOMProcess(), started.
2012-02-03 05:17:47,576 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT> WarrantyExpirationTask.AllowSOMProcess(), ended.
2012-02-03 05:17:47,577 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT> WarrantyExpirationTask. global sender in contract renewal process is null..reinitializing..
2012-02-03 05:17:47,577 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT>  Initializing the SOM Sender Interface.
2012-02-03 05:17:47,968 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT>  SOM Sender Interface Initialization completed sucessfully.
2012-02-03 05:17:47,968 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT> WarrantyExpirationTask. proceeding after init..
2012-02-03 05:17:47,968 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT> WarrantyExpirationTask. work to do..
2012-02-03 05:17:47,969 INFO  [STDOUT] <Fri Feb 03 05:17:47 EST 2012> <Debug> <SOT> WarrantyExpirationTask.SOMReqForCAWarrantyNotif(), started.
2012-02-03 05:18:00,183 ERROR [org.jboss.ejb.plugins.LogInterceptor] Unexpected Error in method: public abstract com.ncr.som.messaging.SOMRequest com.ncr.sot.ejb.SOTAdministration.getSOMWarRecordsForCANotif(java.lang.String) throws com.ncr.common.exception.NCRException
java.lang.OutOfMemoryError: Java heap space
2012-02-03 05:18:00,187 INFO  [STDOUT] Exception in thread "Timer-5" 
2012-02-03 05:18:00,188 INFO  [STDOUT] javax.ejb.EJBException: Unexpected Error
java.lang.OutOfMemoryError: Java heap space
2012-02-03 05:18:00,188 INFO  [STDOUT] 	at org.jboss.ejb.plugins.LogInterceptor.handleException(LogInterceptor.java:395)
2012-02-03 05:18:00,188 INFO  [STDOUT] 	at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:196)
2012-02-03 05:18:00,189 INFO  [STDOUT] 	at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
2012-02-03 05:18:00,189 INFO  [STDOUT] 	at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:624)
2012-02-03 05:18:00,189 INFO  [STDOUT] 	at org.jboss.ejb.Container.invoke(Container.java:873)
2012-02-03 05:18:00,189 INFO  [STDOUT] 	at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:415)
2012-02-03 05:18:00,189 INFO  [STDOUT] 	at org.jboss.ejb.plugins.local.StatelessSessionProxy.invoke(StatelessSessionProxy.java:88)
2012-02-03 05:18:00,190 INFO  [STDOUT] 	at $Proxy76.getSOMWarRecordsForCANotif(Unknown Source)
2012-02-03 05:18:00,190 INFO  [STDOUT] 	at com.ncr.sot.startup.WarrantyExpirationTask.SOMReqForCAWarrantyNotif(WarrantyExpirationTask.java:732)
2012-02-03 05:18:00,190 INFO  [STDOUT] 	at com.ncr.sot.startup.WarrantyExpirationTask.runSOMInterface(WarrantyExpirationTask.java:708)
2012-02-03 05:18:00,190 INFO  [STDOUT] 	at com.ncr.sot.startup.WarrantyExpirationTask.run(WarrantyExpirationTask.java:673)
2012-02-03 05:18:00,190 INFO  [STDOUT] 	at java.util.TimerThread.mainLoop(Timer.java:512)
2012-02-03 05:18:00,191 INFO  [STDOUT] 	at java.util.TimerThread.run(Timer.java:462)

I'm facing this java.lang.OutOfMemoryError: Java heap space. My application is deployed on Jboss AS on unix. Kindly suggest me how deal with it and also where I can increas its size on JBoss?

In the run.conf file in bin folder of JBoss, search for "JAVA_OPTS".
And modify the size as required. Eg - JAVA_OPTS="-Xms512m -Xmx1024m

Thanks and Regards,
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Komal Renu | krenu@infocepts.com | www.infocepts.com
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You can set the heap size in bin/run.conf.

You can find out what is taking up the heap space by setting -XX:+HeapDumpOnOutOfMemoryError, and then loading the resulting file into VirtaulVM.