Hello,
I am receiving an intermittent NullPointerException when I call the
request.setAttribute(java.lang.String name, java.lang.Object o) method from my
servlet. The error is not consistently reproducible and only happens
infrequently. We are running tomcat 5.0.25 on a Linux server. The error is
occurring on a page that has about 100 users accessing it, auto-refreshing
every 30-60 seconds. The object I am setting as an attribute is of type List
(ArrayList) and it is not null when I set it.
A printStackTrace shows that the error is occurring at line 1472 of
CoyoteRequest.java on context.getapplicationEventListenders:
Object listeners[] = context.getApplicationEventListeners();
I assume that, when the exception is thrown, context is null, but I'm not sure
what would cause this. In every instance this error does not occur again when
the user refreshes his/her request.
Is this a known bug in Tomcat 5.0.25? Otherwise, could it be some sort of
memory problem? What would cause context to infrequently and seemingly
randomly be null?
A full stack trace is below. The name of my servlet is OrderBook. I greatly
appreciate any help.
2005-01-18 09:14:51 StandardWrapperValve[OrderBook]: Servlet.service() for
servlet OrderBook threw exception
java.lang.NullPointerException
at
org.apache.coyote.tomcat5.CoyoteRequest.setAttribute(CoyoteRequest.java:1472)
at
org.apache.coyote.tomcat5.CoyoteRequestFacade.setAttribute(CoyoteRequestFacade.java:349)
at
com.ubs.koba.web.OrderBookController.doProcess(OrderBookController.java:36)
at com.ubs.koba.web.BaseServlet.init(BaseServlet.java:92)
at com.ubs.koba.web.BaseServlet.doGet(BaseServlet.java:139)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:793)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:702)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:571)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:644)
at java.lang.Thread.run(Thread.java:534)
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