tomcat中的UncaughtExceptionHandler

Question

我在执行我的 Web 应用程序时在 tomcat 源中出现内存不足错误。

java.lang.OutOfMemoryError： Java heap space

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)    

我添加了Thread.currentThread()。setDefaultUncaughtExceptionHandler(new oo mehandler())；在我的主线程中，当从webclient执行任务时，我得到了OOMError，但是OOMError没有被UncaughtExceptionHandler捕获。

我怎么才能抓住它？

Answer 1

UncaughtExceptionHandler 也将捕获 OutOfMemoryError。你似乎把它设置得恰到好处。因此，要么其他进程在之后调用它（您可以通过设置函数的断点进行检查），要么 TomCat 在您的线程上设置了自己的一个，您可以通过调用 Thread.currentThread（）.getUncaughtExceptionHandler（） 来检查。如果未设置，这将返回 null。

另请注意，setDefaultExceptionHandler（） 是静态的，因此您不应该在对象上调用它，而应该在类上调用它，因此：

Thread.setDefaultUncaughtExceptionHandler(new OOMEHandler());

而不是

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