[MARMOTTA-277] Fix the Monitoring (Task) Service

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.0-incubating
• Fix Version/s: 3.1-incubating
• Component/s: Platform
• Assignee: Sergio Fernández
• Reporter: Jakob Frank
• Created: 25/Jul/13 14:31
• Updated: 03/Oct/13 13:38
• Resolved: 28/Jul/13 14:22

Description

In some installations, the current tasks list in the admin-ui is filled up with entries that are no longer valid (i.e. tasks that are already finished)

Now i found the following stacktrace in tomcat's localhost.log:
Jul 23, 2013 4:40:49 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [default] in context with path [] threw exception
org.jboss.resteasy.spi.UnhandledException: java.util.ConcurrentModificationException
at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:365)
at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:233)
at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:209)
at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:557)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524)
at org.jboss.resteasy.core.SynchronousDispatcher.invokePropagateNotFound(SynchronousDispatcher.java:169)
at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:212)
at org.jboss.resteasy.plugins.server.servlet.FilterDispatcher.doFilter(FilterDispatcher.java:59)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:186)
at org.apache.marmotta.platform.core.filters.ModuleResourceFilter.doFilter(ModuleResourceFilter.java:163)
at org.apache.marmotta.platform.core.filters.ModuleResourceFilter$Proxy$$$_WeldClientProxy.doFilter(ModuleResourceFilter$Proxy$$$_We
ldClientProxy.java)
at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:181)
at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:183)
at org.apache.marmotta.platform.core.filters.MarmottaServerNameFilter.doFilter(MarmottaServerNameFilter.java:104)
at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:181)
at org.apache.marmotta.platform.core.filters.TemplatingFilter.doFilter(TemplatingFilter.java:176)
at org.apache.marmotta.platform.core.filters.TemplatingFilter$Proxy$$$_WeldClientProxy.doFilter(TemplatingFilter$Proxy$$$_WeldClient
Proxy.java)
at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:181)
at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:183)
at org.apache.marmotta.platform.security.filters.MarmottaAccessControlFilter.doFilter(MarmottaAccessControlFilter.java:142)
at org.apache.marmotta.platform.security.filters.MarmottaAccessControlFilter$Proxy$_$$_WeldClientProxy.doFilter(MarmottaAccessControlF
ilter$Proxy$_$$_WeldClientProxy.java)
at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:181)
at org.apache.marmotta.platform.user.filters.MarmottaAuthenticationFilter.doFilter(MarmottaAuthenticationFilter.java:163)
at org.apache.marmotta.platform.user.filters.MarmottaAuthenticationFilter$Proxy$_$$_WeldClientProxy.doFilter(MarmottaAuthenticationFil
ter$Proxy$_$$_WeldClientProxy.java)
[...]
Caused by: java.util.ConcurrentModificationException
at java.util.WeakHashMap$HashIterator.nextEntry(WeakHashMap.java:784)
at java.util.WeakHashMap$ValueIterator.next(WeakHashMap.java:811)
at org.apache.marmotta.platform.core.services.task.TaskManagerServiceImpl.getTasks(TaskManagerServiceImpl.java:99)
at org.apache.marmotta.platform.core.services.task.TaskManagerServiceImpl.getTasksByGroup(TaskManagerServiceImpl.java:182)
at org.apache.marmotta.platform.core.services.task.TaskManagerServiceImpl$Proxy$$$_WeldClientProxy.getTasksByGroup(TaskManagerServiceImpl$Proxy$$$_WeldClientProxy.java)
at org.apache.marmotta.platform.core.webservices.task.TaskManagerWebService.list(TaskManagerWebService.java:69)
at org.apache.marmotta.platform.core.webservices.task.TaskManagerWebService$Proxy$$$_WeldClientProxy.list(TaskManagerWebService$Proxy$$$_WeldClientProxy.java)
at sun.reflect.GeneratedMethodAccessor73.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167)
at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:211)
at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542)
... 50 more