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POUncaughtExceptionHandler in tomcat
 

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    <p>I'm getting OutOfMemoryError in tomcat source while executing my web application.</p> <p><strong>java.lang.OutOfMemoryError: Java heap space</strong></p> <pre><code>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) </code></pre> <p>I have added <strong>Thread.currentThread().setDefaultUncaughtExceptionHandler(new OOMEHandler());</strong> in my main Thread, Now I'm getting OOMError while executing task from webclient, but OOMError not catched by the UncaughtExceptionHandler.</p> <p>How can i catch it?</p>
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    1. COAre you sure that the same thread for which you invoked `setDefaultUncaughtExceptionHandler` is also the thread that experienced the `OutOfMemoryError`? Remember that Tomcat uses thread pools; depending on how your request/response cycle is designed, it's possible that theses end up being two different threads.
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    2. COAlso java.lang.OutOfMemoryError is a Error which is subtype of Throwable. I think only Exception types will trigger UncaughtExceptionHandler. Try throwing a RunTimeException to see if this is true.
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    3. CO@Isaac I've added the exception trace, and not sure about whether OutOfMemoryError experienced in the same thread or not. if the thread invoked by tomcat then how can i catch OutOfMemoryError ?
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