我在 Tomcat 中运行 Java Web 应用程序。该应用程序使用 Quartz 框架定期安排 cron 作业。此 cron 作业涉及解析一个 4+ MB 的 xml 文件,我正在使用 JDOM API 进行此操作。xml 文件包含大约 3600 个要解析的节点,因此要在 DB 中更新数据,我正在按顺序进行。
在解析了几乎一半的文件后,我的应用程序抛出了内存不足异常。相同的堆栈跟踪是:
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)
这甚至导致我的 tomcat 崩溃。你能帮我诊断问题吗?我什至在 Netbeans 中启用了相同的分析,但似乎即使这样也崩溃了。我保留了分配给 Tomcat 的默认内存。是否发生任何内存泄漏。我的数据库是 postgres,JDK 是 1.6.0_15。
谢谢,阿米特