Java out of memory Exception

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