Java out of memory Exception

java tomcat xml-parsing quartz-scheduler jdom
Amit picture Amit · Nov 30, 2009 · Viewed 32.8k times · Source

I am running a Java Web Application in Tomcat. The application uses Quartz framework to schedule the cron job at regular intervals. This cron job involves parsing a 4+ MB xml file, which I am doing using JDOM API. The xml file contains around 3600 nodes to be parsed and consequently data to be updated in DB which I am doing it sequentially.
After parsing almost half of the file, my application throws a Out of Memory Exception. The stack trace of the same is :

Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOfRange(Arrays.java:3210)
        at java.lang.String.<init>(String.java:216)
        at java.lang.StringBuffer.toString(StringBuffer.java:585)
        at org.netbeans.lib.profiler.server.ProfilerRuntimeMemory.traceVMObjectAlloc(ProfilerRuntimeMemory.java:170)
        at java.lang.Throwable.getStackTraceElement(Native Method)
        at java.lang.Throwable.getOurStackTrace(Throwable.java:590)
        at java.lang.Throwable.getStackTrace(Throwable.java:582)
        at org.apache.juli.logging.DirectJDKLog.log(DirectJDKLog.java:155)
        at org.apache.juli.logging.DirectJDKLog.error(DirectJDKLog.java:135)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1603)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
        at java.lang.Thread.run(Thread.java:619)
Exception in thread "*** JFluid Monitor thread ***" java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOf(Arrays.java:2760)
        at java.util.Arrays.copyOf(Arrays.java:2734)
        at java.util.Vector.ensureCapacityHelper(Vector.java:226)
        at java.util.Vector.add(Vector.java:728)
        at org.netbeans.lib.profiler.server.Monitors$SurvGenAndThreadsMonitor.updateSurvGenData(Monitors.java:230)
        at org.netbeans.lib.profiler.server.Monitors$SurvGenAndThreadsMonitor.run(Monitors.java:169)
Nov 30, 2009 2:22:05 PM org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor processChildren
SEVERE: Exception invoking periodic operation:
java.lang.OutOfMemoryError: Java heap space
        at java.lang.StringCoding$StringEncoder.encode(StringCoding.java:232)
        at java.lang.StringCoding.encode(StringCoding.java:272)
        at java.lang.String.getBytes(String.java:946)
        at java.io.UnixFileSystem.getLastModifiedTime(Native Method)
        at java.io.File.lastModified(File.java:826)
        at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1175)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1269)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:296)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:118)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
        at java.lang.Thread.run(Thread.java:619)
ERROR [JobRunShell]: Job updateVendorData.quoteUpdate threw an unhandled Exception:
java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOfRange(Arrays.java:3210)
        at java.lang.String.<init>(String.java:216)
        at java.lang.StringBuffer.toString(StringBuffer.java:585)
        at org.apache.commons.dbcp.PoolingConnection$PStmtKey.hashCode(PoolingConnection.java:296)
        at java.util.HashMap.get(HashMap.java:300)
        at org.apache.commons.pool.impl.GenericKeyedObjectPool.decrementActiveCount(GenericKeyedObjectPool.java:1085)
        at org.apache.commons.pool.impl.GenericKeyedObjectPool.returnObject(GenericKeyedObjectPool.java:882)
        at org.apache.commons.dbcp.PoolablePreparedStatement.close(PoolablePreparedStatement.java:80)
        at org.apache.commons.dbcp.DelegatingStatement.close(DelegatingStatement.java:168)
        at com.netcore.smsapps.stock.db.CompanyDaoImpl.updateCompanyQuote(CompanyDaoImpl.java:173)
        at com.netcore.smsapps.stock.vendor.MyirisVendor.readScripQuotes(MyirisVendor.java:159)
        at com.netcore.smsapps.stock.update.StockUpdateData.execute(StockUpdateData.java:38)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:207)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)
DEBUG [ExceptionHelper]: Detected JDK support for nested exceptions.
ERROR [ErrorLogger]: Job (updateVendorData.quoteUpdate threw an exception.
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested exception: java.lang.OutOfMemoryError: Java heap space]
        at org.quartz.core.JobRunShell.run(JobRunShell.java:216)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)
Caused by: java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOfRange(Arrays.java:3210)
        at java.lang.String.<init>(String.java:216)
        at java.lang.StringBuffer.toString(StringBuffer.java:585)
        at org.apache.commons.dbcp.PoolingConnection$PStmtKey.hashCode(PoolingConnection.java:296)
        at java.util.HashMap.get(HashMap.java:300)
        at org.apache.commons.pool.impl.GenericKeyedObjectPool.decrementActiveCount(GenericKeyedObjectPool.java:1085)
        at org.apache.commons.pool.impl.GenericKeyedObjectPool.returnObject(GenericKeyedObjectPool.java:882)
        at org.apache.commons.dbcp.PoolablePreparedStatement.close(PoolablePreparedStatement.java:80)
        at org.apache.commons.dbcp.DelegatingStatement.close(DelegatingStatement.java:168)
        at com.netcore.smsapps.stock.db.CompanyDaoImpl.updateCompanyQuote(CompanyDaoImpl.java:173)
        at com.netcore.smsapps.stock.vendor.MyirisVendor.readScripQuotes(MyirisVendor.java:159)
        at com.netcore.smsapps.stock.update.StockUpdateData.execute(StockUpdateData.java:38)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:207)

This causes even my tomcat to crash. Can you please help me in diagnosing the problem. I even have enabled profiling in the Netbeans for the same but it seems that even that crashed. I have kept the default memory allocated to Tomcat. Is there any memory leak taking place. My DB is postgres and JDK is 1.6.0_15.

Thanks, Amit

Answer

user1374131 picture user1374131 · Jan 9, 2013

Try increasing the ram allocation for your JVM. It should help.

Fix for eclipse: You can configure this in eclipse preference as follows

  1. Windows -> Preferences ( on mac its: eclipse ->preferences)
  2. Java -> Installed JREs
  3. Select the JRE and click on Edit
  4. on the default VM arguments field type in -Xmx1024M. (or your memory preference,for 1 gb of ram its 1024)
  5. Click on finish or OK.

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