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From "Sands Fish (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COCOON-2277) NPE in DynamicURLStreamHandlerFactory (Cocoon JNET)
Date Mon, 20 Sep 2010 18:37:33 GMT

    [ https://issues.apache.org/jira/browse/COCOON-2277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912629#action_12912629
] 

Sands Fish commented on COCOON-2277:
------------------------------------

I'm from the "other open source project", and I want to confirm that this bug is biting us
very hard.  I work on MIT's DSpace repository, and we are seeing regular occurrences of up
to 3 or 4 times per day on our production instance.  

I was able to reproduce the condition by stressing our server with a large amount of concurrent
requests on the same URL.  Particularly, on a URL that throws an exception during pipeline
processing, though this is correct behavior for our application.  

We received the exact same exception as listed above and this is happening on a regular basis
due to the amount of traffic from spiders + normal traffic.

Could someone please comment on the status of this fix and the anticipated resolution time?
 There are some hacks on the JIRA ticket for DSpace listed above.

> NPE in DynamicURLStreamHandlerFactory (Cocoon JNET)
> ---------------------------------------------------
>
>                 Key: COCOON-2277
>                 URL: https://issues.apache.org/jira/browse/COCOON-2277
>             Project: Cocoon
>          Issue Type: Bug
>          Components: * Cocoon Core, - Servlet service framework
>    Affects Versions: 2.2-dev (Current SVN)
>            Reporter: Gabriel Gruber
>            Priority: Critical
>
> From time to time after more heavy of our cocoon 2.2 based application (which is not
yet in production) I am getting this exception from cocoon jnet. after this exception occurs
we have to restart the web application as this exception keeps coming and noone can do anything
with the webapp....
> java.lang.NullPointerException
>                 java.util.LinkedList.remove(LinkedList.java:646)
>                 java.util.LinkedList.remove(LinkedList.java:360)
>                 org.apache.cocoon.jnet.DynamicURLStreamHandlerFactory.pop(DynamicURLStreamHandlerFactory.java:30)
>                 org.apache.cocoon.jnet.URLHandlerFactoryCollector.popUrlHandlerFactories(URLHandlerFactoryCollector.java:57)
>                 org.apache.cocoon.jnet.URLHandlerFactoryCollector.installURLHandlers(URLHandlerFactoryCollector.java:39)
>                 sun.reflect.GeneratedMethodAccessor516.invoke(Unknown Source)
>                 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>                 java.lang.reflect.Method.invoke(Method.java:585)
>                 org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:627)
>                 org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:616)
>                 org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:64)
>                 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>                 org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
>                 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>                 org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
>                 $Proxy34.service(Unknown Source)
>                 org.apache.cocoon.servletservice.ServletServiceContext$PathDispatcher.forward(ServletServiceContext.java:481)
>                 org.apache.cocoon.servletservice.ServletServiceContext$PathDispatcher.forward(ServletServiceContext.java:455)
>                 org.apache.cocoon.servletservice.spring.ServletFactoryBean$ServiceInterceptor.invoke(ServletFactoryBean.java:245)
>                 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>                 org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
>                 $Proxy94.service(Unknown Source)
>                 org.apache.cocoon.servletservice.DispatcherServlet.service(DispatcherServlet.java:106)
>                 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
>                 org.apache.cocoon.servlet.multipart.MultipartFilter.doFilter(MultipartFilter.java:131)
> *NOTE* that another open source project reported similar problems:
> http://jira.dspace.org/jira/browse/DS-253?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel


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