Patches item #1447670, was opened at 2006-03-11 01:35
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Gili Tzabari (cowwoc)
Assigned to: Nobody/Anonymous (nobody)
Summary: Thread-safety bug in SharedResources.java
Initial Comment:
I can't create a patch file because CVS is down but
this is an easy patch so you can do it by hand.
SharedResources.javs line 448 reads:
resourceState.touch(key);
please replace this with:
synchronized (resourceState)
{
resourceState.touch(key);
}
Otherwise, you end up with:
java.lang.IllegalStateException: Task already scheduled
or cancelled
at java.util.Timer.sched(Timer.java:358)
at java.util.Timer.schedule(Timer.java:170)
at
wicket.SharedResources$ResourceState.makeCacheTask(SharedResources.java:94)
at
wicket.SharedResources$ResourceState.touch(SharedResources.java:143)
at
wicket.SharedResources.onResourceRequested(SharedResources.java:448)
at
wicket.request.target.resource.SharedResourceRequestTarget.respond(SharedResourceRequestTarget.java:104)
at
wicket.request.compound.DefaultResponseStrategy.respond(DefaultResponseStrategy.java:49)
at
wicket.request.compound.AbstractCompoundRequestCycleProcessor.respond(AbstractCompoundRequestCycleProcessor.java:66)
at
wicket.RequestCycle.doProcessEventsAndRespond(RequestCycle.java:824)
at
wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:856)
at wicket.RequestCycle.step(RequestCycle.java:931)
at
wicket.RequestCycle.steps(RequestCycle.java:1005)
at
wicket.RequestCycle.request(RequestCycle.java:451)
at
wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:212)
because two threads hit the same resource at the same
time, and ResourceState is not thread-safe.
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