java - tomcat中的UncaughtExceptionHandler

Question

我在执行我的网络应用程序时在 tomcat 源代码中遇到 OutOfMemoryError。

java.lang.OutOfMemoryError: Java 堆空间

java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)
at java.lang.AbstractStringBuilder.append(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at com.source.server.wc.common.SupportAction.execute(SupportAction.java:252)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.source.server.wc.common.AuthenticationFilter.doFilter(AuthenticationFilter.java:300)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.source.server.wc.common.EncodingFilter.doFilter(EncodingFilter.java:70)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)    

我已经添加了 Thread.currentThread().setDefaultUncaughtExceptionHandler(new OOMEHandler()); 在我的主线程中，现在我在从 webclient 执行任务时遇到 OOMError，但 OOMError 未被 UncaughtExceptionHandler 捕获。

我怎样才能捕获它？

Answer 1

UncaughtExceptionHandler也会 catch OutOfMemoryError .您似乎正在正确设置它。所以要么其他进程在之后调用它(您可以通过设置函数的断点来检查)，或者 TomCat 有自己的一个设置在您的 Thread 上。 ，您可以通过调用 Thread.currentThread().getUncaughtExceptionHandler() 来检查.这将返回 null如果没有设置。

另请注意 setDefaultExceptionHandler()是静态的，所以你不应该在对象上调用它，而是在类上调用它，所以:

Thread.setDefaultUncaughtExceptionHandler(new OOMEHandler());

代替

Thread.currentThread().setDefaultUncaughtExceptionHandler(new OOMEHandler());