Re: 400 Error WebObjects

Sun, 26 Jul 2009 15:38:32 -0700 


On Jul 26, 2009, at 1:36 PM, Shravan Kumar. M wrote:


Hello Group,
Often sometimes when am working on my app, the app hangs on, I mean browser does not get any response for a long time, finally browser displays "No instance page", but today I got "400 Error WebObjects" page [Note that, all these times, just restart of the app makes everything normal]. 

That my mean it is dead locked.  It may mean it is just busy.
I have got the thread dump when I saw my app not responding for a while, can any one advise what is happening here (please help me how to interpret the thread dump log):
That dump is from a completely idle application. There are no deadlocks and no activity. 


Chuck
Few things I have understood from the thread dump below, please validate: 
1) WorkerThread6 has locked <0x0919dd10>
2) Other WorkerThreads are "waiting to lock <0x0919dd10>"
= = = = = = = = = = = = = = = = = = = = ====================================================================== 

Full thread dump Java HotSpot(TM) Client VM (1.5.0_16-133 mixed mode):
"Java2D Disposer" daemon prio=10 tid=0x0104e500 nid=0x831600 in Object.wait() [0xb0f0f000..0xb0f0fd90] 
    at java.lang.Object.wait(Native Method)
    - waiting on <0x0966ddf0> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:120)
    - locked <0x0966ddf0> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:136)
    at sun.java2d.Disposer.run(Disposer.java:125)
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread15" prio=5 tid=0x010429b0 nid=0x8c1200 waiting for monitor entry [0xb178c000..0xb178cd90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread14" prio=5 tid=0x010421e0 nid=0x8c0400 waiting for monitor entry [0xb170b000..0xb170bd90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread13" prio=5 tid=0x01041980 nid=0x8bf600 waiting for monitor entry [0xb1626000..0xb1626d90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread12" prio=5 tid=0x010411e0 nid=0x8be800 waiting for monitor entry [0xb15a5000..0xb15a5d90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread11" prio=5 tid=0x01040a20 nid=0x8bda00 waiting for monitor entry [0xb1524000..0xb1524d90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread10" prio=5 tid=0x01040260 nid=0x8bcc00 waiting for monitor entry [0xb14a3000..0xb14a3d90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread9" prio=5 tid=0x0103fa40 nid=0x8bbe00 waiting for monitor entry [0xb1422000..0xb1422d90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread8" prio=5 tid=0x0103f5d0 nid=0x8bb000 waiting for monitor entry [0xb13a1000..0xb13a1d90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread7" prio=5 tid=0x0103eb10 nid=0x8ba200 waiting for monitor entry [0xb1320000..0xb1320d90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread6" prio=5 tid=0x0103e330 nid=0x8b9400 runnable [0xb129f000..0xb129fd90] 
    at java.net.PlainSocketImpl.socketAccept(Native Method)
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
    - locked <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread5" prio=5 tid=0x0103dba0 nid=0x8b8600 waiting for monitor entry [0xb121e000..0xb121ed90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread4" prio=5 tid=0x0103d410 nid=0x8b7800 waiting for monitor entry [0xb119d000..0xb119dd90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread3" prio=5 tid=0x0103cc50 nid=0x8b6a00 waiting for monitor entry [0xb111c000..0xb111cd90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread2" prio=5 tid=0x0103c420 nid=0x8b5c00 waiting for monitor entry [0xb109b000..0xb109bd90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread1" prio=5 tid=0x0103c240 nid=0x8b4e00 waiting for monitor entry [0xb101a000..0xb101ad90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"WorkerThread0" prio=5 tid=0x0103bc90 nid=0x8b3200 waiting for monitor entry [0xb0f99000..0xb0f99d90] 
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:382)
    - waiting to lock <0x0919dd10> (a java.net.SocksSocketImpl)
    at java.net.ServerSocket.implAccept(ServerSocket.java:450)
    at java.net.ServerSocket.accept(ServerSocket.java:421)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:238) 
    at java.lang.Thread.run(Thread.java:613)
"AWT-AppKit" daemon prio=5 tid=0x010322f0 nid=0xa01e2720 runnable [0x00000000..0xbfffd698]
"Thread-0" daemon prio=5 tid=0x010280e0 nid=0x86b200 waiting on condition [0xb0e8e000..0xb0e8ed90] 
    at java.lang.Thread.sleep(Native Method)
at com.webobjects.appserver.WOApplication $_LifebeatThread.run(WOApplication.java:1233)
"Session Timeout Thread" daemon prio=5 tid=0x0102fb70 nid=0x845800 waiting on condition [0xb0e0d000..0xb0e0dd90] 
    at java.lang.Thread.sleep(Native Method)
at com.webobjects.appserver.WOSessionStore $_SessionTimeoutManager.run(WOSessionStore.java:110) 
    at java.lang.Thread.run(Thread.java:613)
"Low Memory Detector" daemon prio=5 tid=0x01012030 nid=0x808800 runnable [0x00000000..0x00000000]
"CompilerThread0" daemon prio=9 tid=0x010112b0 nid=0x807a00 waiting on condition [0x00000000..0xb0c8a7d8]
"Signal Dispatcher" daemon prio=9 tid=0x01010ff0 nid=0x806c00 waiting on condition [0x00000000..0x00000000]
"JDWP Command Reader" daemon prio=5 tid=0x0100d420 nid=0x805e00 runnable [0x00000000..0x00000000]
"JDWP Event Helper Thread" daemon prio=5 tid=0x0100cf50 nid=0x814a00 runnable [0x00000000..0x00000000]
"JDWP Transport Listener: dt_socket" daemon prio=5 tid=0x0100c250 nid=0x813000 runnable [0x00000000..0xb0a86ae0]
"Finalizer" daemon prio=8 tid=0x01007980 nid=0x81a400 in Object.wait() [0xb0a05000..0xb0a05d90] 
    at java.lang.Object.wait(Native Method)
    - waiting on <0x09090550> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:120)
    - locked <0x09090550> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:136)
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=10 tid=0x010075a0 nid=0x818a00 in Object.wait() [0xb0984000..0xb0984d90] 
    at java.lang.Object.wait(Native Method)
    - waiting on <0x09090578> (a java.lang.ref.Reference$Lock)
    at java.lang.Object.wait(Object.java:474)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java: 116) 
    - locked <0x09090578> (a java.lang.ref.Reference$Lock)
"main" prio=5 tid=0x010016b0 nid=0xb0801000 in Object.wait() [0xb07ff000..0xb0800148] 
    at java.lang.Object.wait(Native Method)
    - waiting on <0x091a2198> (a com.webobjects.appserver._WORunLoop)
at com .webobjects .appserver._WORunLoop._acceptInputBeforeDate(_WORunLoop.java:217) at com.webobjects.appserver._WORunLoop.runBeforeDate(_WORunLoop.java:71) 
    - locked <0x091a2198> (a com.webobjects.appserver._WORunLoop)
at com.webobjects.appserver.WOApplication._runOnce(WOApplication.java: 775) at com.webobjects.appserver.WOApplication.run(WOApplication.java: 900) at com.webobjects.appserver.WOApplication.main(WOApplication.java:324) 
    at com.mtj.Application.main(Application.java:130)

"VM Thread" prio=9 tid=0x01006cf0 nid=0x817c00 runnable
"VM Periodic Task Thread" prio=9 tid=0x01012b90 nid=0x81e200 waiting on condition
"Exception Catcher Thread" prio=10 tid=0x010018d0 nid=0x80be00 runnable
= = = = = = = = = = = = = = = = = = = = ====================================================================== 

Thank You
Shravan Kumar. M
------------------------------


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Chuck Hill             Senior Consultant / VP Development

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