2010/8/10 Christopher Schultz <ch...@christopherschultz.net> > > It could be that Tomcat is attempting to resolve the SYSTEM URL for > certain XML files it uses to configure itself. Could you re-enable the > DROP and take a thread dump during the long wait? That will help > nail-down the problem. Perhaps Tomcat can be modified so that it does > not perform this look-up. > > Oh, it's my misunderstanding - I made thread dump earlier, but thought it only being produced for non-blocked by I/O threads, so it's not complete and useless.
Now, I reviewed old dump and made new one. That's it - "main" thread hangs in some socket operation. Full thread dump Java HotSpot(TM) 64-Bit Server VM (14.2-b01 mixed mode): "Attach Listener" daemon prio=10 tid=0x00007f60aeec7000 nid=0x6275 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "GC Daemon" daemon prio=10 tid=0x00007f60aecc3800 nid=0x6254 in Object.wait() [0x0000000040c31000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00007f60b4e701d0> (a sun.misc.GC$LatencyLock) at sun.misc.GC$Daemon.run(GC.java:100) - locked <0x00007f60b4e701d0> (a sun.misc.GC$LatencyLock) "Low Memory Detector" daemon prio=10 tid=0x00000000401a9800 nid=0x6252 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "CompilerThread1" daemon prio=10 tid=0x00007f60a8001000 nid=0x6251 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "CompilerThread0" daemon prio=10 tid=0x00000000401a5000 nid=0x6250 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Signal Dispatcher" daemon prio=10 tid=0x00000000401a3000 nid=0x624f runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Finalizer" daemon prio=10 tid=0x0000000040184800 nid=0x624e in Object.wait() [0x0000000041e07000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00007f60b4e70ac0> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118) - locked <0x00007f60b4e70ac0> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159) "Reference Handler" daemon prio=10 tid=0x000000004017d800 nid=0x624d in Object.wait() [0x0000000041d06000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00007f60b4e701b0> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:485) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116) - locked <0x00007f60b4e701b0> (a java.lang.ref.Reference$Lock) "main" prio=10 tid=0x0000000040113000 nid=0x6243 runnable [0x0000000041fc0000] java.lang.Thread.State: RUNNABLE at java.net.PlainSocketImpl.initProto(Native Method) at java.net.PlainSocketImpl.<clinit>(PlainSocketImpl.java:84) at java.net.ServerSocket.setImpl(ServerSocket.java:236) at java.net.ServerSocket.<init>(ServerSocket.java:178) at java.net.ServerSocket.<init>(ServerSocket.java:141) at org.apache.tomcat.util.net.DefaultServerSocketFactory.createSocket(DefaultServerSocketFactory.java:50) at org.apache.tomcat.util.net.JIoEndpoint.init(JIoEndpoint.java:538) at org.apache.coyote.http11.Http11Protocol.init(Http11Protocol.java:176) at org.apache.catalina.connector.Connector.initialize(Connector.java:1014) at org.apache.catalina.core.StandardService.initialize(StandardService.java:680) - locked <0x00007f60b4ec2650> (a [Lorg.apache.catalina.connector.Connector;) at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:795) at org.apache.catalina.startup.Catalina.load(Catalina.java:524) at org.apache.catalina.startup.Catalina.load(Catalina.java:548) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:261) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413) "VM Thread" prio=10 tid=0x0000000040176800 nid=0x624c runnable "GC task thread#0 (ParallelGC)" prio=10 tid=0x000000004011d000 nid=0x6244 runnable "GC task thread#1 (ParallelGC)" prio=10 tid=0x000000004011f000 nid=0x6245 runnable "GC task thread#2 (ParallelGC)" prio=10 tid=0x0000000040120800 nid=0x6246 runnable "GC task thread#3 (ParallelGC)" prio=10 tid=0x0000000040122800 nid=0x6247 runnable "GC task thread#4 (ParallelGC)" prio=10 tid=0x0000000040124800 nid=0x6248 runnable "GC task thread#5 (ParallelGC)" prio=10 tid=0x0000000040126000 nid=0x6249 runnable "GC task thread#6 (ParallelGC)" prio=10 tid=0x0000000040128000 nid=0x624a runnable "GC task thread#7 (ParallelGC)" prio=10 tid=0x000000004012a000 nid=0x624b runnable "VM Periodic Task Thread" prio=10 tid=0x00000000401ac000 nid=0x6253 waiting on condition JNI global references: 956
