tomcat中集群环境中的内存泄漏

Question

我在我的应用程序中得到了OutOfMemory异常。我拿了垃圾堆，在垫子上进行了分析。在分析我的应用程序内存使用情况时，我发现了以下疑点。我不明白这些嫌疑犯背后的主要原因。

请帮助我理解这个泄漏嫌疑人和有什么相关的解决方案。

嫌疑犯1

线程org.apache.tomcat.util.threads.TaskThread @ 0x2bdf5ff8 "ajp-bio-9002"-exec-5保持局部变量的总大小为113,973,288 (50.72%)字节。

内存累积在"org.apache.catalina.loader.StandardClassLoader @0x293b4488加载的"org.apache.tomcat.util.threads.TaskThread“的一个实例中。

线程堆栈

"ajp-bio-9002"-exec-5 at java.util.Arrays.copyOf([CI)[C (Arrays.java:2882) at java.lang.AbstractStringBuilder.append(C)Ljava/lang/AbstractStringBuilder；(AbstractStringBuilder.java:100) at java.lang.AbstractStringBuilder.append(C)Ljava/lang/AbstractStringBuilder；(AbstractStringBuilder.java:572) at java.lang.StringBuffer.append(C)Ljava/lang/StringBuffer；(StringBuffer.java:320) at org.apache.myfaces.renderkit.html.util.ReducedHTMLParser.consumeString(C)Ljava/lang/String；)( org.apache.myfaces.renderkit.html.util.ReducedHTMLParser.consumeAttrValue()Ljava/lang/String；(ReducedHTMLParser.java:327) at org.apache.myfaces.renderkit.html.util.ReducedHTMLParser.parse()V (ReducedHTMLParser.java:579) at org.apache.myfaces.renderkit.html.util.ReducedHTMLParser.parse(Ljava/lang/CharSequence;Lorg/apache/myfaces/renderkit/html/util/CallbackListener；) (ReducedHTMLParser.java:303))V ( org.apache.myfaces.renderkit.html.util.DefaultAddResource.parseResponse(Ljavax/servlet/http/HttpServletRequest;Ljava/lang/String;Ljavax/servlet/http/HttpServletResponse;)V (DefaultAddResource.java:699) at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servlet/FilterChain;)V (ExtensionsFilter.java:157) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse；))V ( org.apache.catalina.core.ApplicationFilterChain.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V (ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(Lorg/apache/catalina/connector/Request;Lorg/apache/catalina/connector/Response;)V (StandardWrapperValve.java:240) at org.apache.catalina.core.StandardContextValve.invoke(Lorg/apache/catalina/connector/Request;Lorg/apache/catalina/connector/Response；))V ( org.apache.catalina.authenticator.AuthenticatorBase.invoke(Lorg/apache/catalina/connector/Request;Lorg/apache/catalina/connector/Response;)V (AuthenticatorBase.java:462) at org.apache.catalina.core.StandardHostValve.invoke(Lorg/apache/catalina/connector/Request;Lorg/apache/catalina/connector/Response;)V (StandardHostValve.java:164) at org.apache.catalina.valves.ErrorReportValve.invoke(Lorg/apache/catalina/connector/Request;Lorg/apache/catalina/connector/Response；))V ( org.apache.catalina.valves.AccessLogValve.invoke(Lorg/apache/catalina/connector/Request;Lorg/apache/catalina/connector/Response;)V (AccessLogValve.java:562) at org.apache.catalina.core.StandardEngineValve.invoke(Lorg/apache/catalina/connector/Request;Lorg/apache/catalina/connector/Response;)V (StandardEngineValve.java:118) at org.apache.catalina.ha.session.JvmRouteBinderValve.invoke(Lorg/apache/catalina/connector/Request;Lorg/apache/catalina/connector/Response；))V ( org.apache.catalina.ha.tcp.ReplicationValve.invoke(Lorg/apache/catalina/connector/Request;Lorg/apache/catalina/connector/Response;)V (ReplicationValve.java:333) at org.apache.catalina.connector.CoyoteAdapter.service(Lorg/apache/coyote/Request;Lorg/apache/coyote/Response;)V (CoyoteAdapter.java:395) at org.apache.coyote.ajp.AjpProcessor.process(Lorg/apache/tomcat/util/net/SocketWrapper;)Lorg/apache/tomcat/util/net/AbstractEndpoint$Handler$SocketState；)( org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(Lorg/apache/tomcat/util/net/SocketWrapper;Lorg/apache/tomcat/util/net/SocketStatus;)Lorg/apache/tomcat/util/net/AbstractEndpoint$Handler$SocketState；(AjpProcessor.java:301) )在org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(Lorg/apache/tomcat/util/net/SocketWrapper;)Lorg/apache/tomcat/util/net/AbstractEndpoint$Handler$SocketState；(AjpProtocol.java:183)( org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run()V (JIoEndpoint.java:302) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Ljava/lang/Runnable;)V (ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run()V (ThreadPoolExecutor.java:908) at java.lang.Thread.run()V (Thread.java:662) )

嫌疑犯2

"java.lang.StringBuffer“加载的一个实例占59 216 088字节(26.35%)。实例由org.apache.myfaces.renderkit.html.util.ReducedHTMLParser @ 0x276990e8引用，由"org.apache.catalina.loader.WebappClassLoader @ 0x29592038“加载。内存在"char[]“由"”加载的一个实例中累积。

Answer 1

您可以转到内存分析器(MAT)的"dominator_tree“选项卡，并展开TaskThread。这将显示该任务线程中所有对象的保留堆。这可能帮助您到达导致问题的应用程序中的部分(代码)。

Answer 2

看来org.apache.myfaces.renderkit.html.util.ReducedHTMLParser是罪魁祸首。ReducedHTMLParser的javadoc解释了它的工作原理。它在内存中缓冲整个HTML响应，然后进行处理。看起来，它试图--而且失败--处理一个非常大的反应。