Re: Blocking in WeakIdentityMap

Hi all

This problem--blocking threads waiting on WeakIdentityMap--appears to
have been a side-effect of profiling; my apologies. The problem only
shows up when the profiler is enabled. The trace for the blocking
thread (that owns the monitor) is below. I was running the profiler in
"full application mode", which for most of the app was not a problem,
but looks like in this case it caused the profiler to instrument
WeakIdentityMap (possibly as a hotspot?) and that led to timing
problems. I set the profiler to ignore the class and the block has
disappeared.

Sorry for the trouble; Vinod, Greg, thanks for the replies
Patrick


"http-8080-Processor8" daemon prio=10 tid=0x081c8000 nid=0x7257
runnable [0xacdc5000..0xacdc81b0]
   java.lang.Thread.State: RUNNABLE
        at java.net.SocketOutputStream.socketWrite0(Native Method)
        at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
        at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
        at java.io.ObjectOutputStream$BlockDataOutputStream.write(ObjectOutputStream.java:1814)
        at java.io.ObjectOutputStream.write(ObjectOutputStream.java:681)
        at com.sun.tools.profiler.server.EventBufferManager.eventBufferDumpHook(EventBufferManager.java:114)
        - locked <0xae2a9898> (a com.sun.tools.profiler.server.ProfilerServer)
        at com.sun.tools.profiler.server.ProfilerInterface$1.handleEventBufferDump(ProfilerInterface.java:121)
        - locked <0xae2a9930> (a java.lang.Object)
        at com.sun.tools.profiler.server.ProfilerRuntimeCPU.copyLocalBuffer(ProfilerRuntimeCPU.java:253)
        - locked <0xae160000> (a [B)
        at com.sun.tools.profiler.server.ProfilerRuntimeCPUSampledInstr.writeCompactEvent(ProfilerRuntimeCPUSampledInstr.java:72)
        at com.sun.tools.profiler.server.ProfilerRuntimeCPUSampledInstr.methodEntry(ProfilerRuntimeCPUSampledInstr.java:154)
        at com.sun.jini.collection.WeakIdentityMap$Key.create(WeakIdentityMap.java:95)
        at com.sun.jini.collection.WeakIdentityMap.get(WeakIdentityMap.java:55)
        at com.sun.jini.start.AggregatePolicyProvider.getCurrentSubPolicy(AggregatePolicyProvider.java:385)
        - locked <0xae6ac370> (a com.sun.jini.collection.WeakIdentityMap)
        at com.sun.jini.start.AggregatePolicyProvider.implies(AggregatePolicyProvider.java:201)
        at java.security.ProtectionDomain.implies(ProtectionDomain.java:213)
        at java.security.AccessControlContext.checkPermission(AccessControlContext.java:301)
        at java.security.AccessController.checkPermission(AccessController.java:546)
        at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
        at javax.security.auth.Subject.getSubject(Subject.java:268)
.
.
.

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