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POJava threading issue on VPS
 

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  1. POJava threading issue on VPS
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    <p>I have a VPS with Centos running with the following details:</p> <pre><code>[root@XXXXXXX~]# uname -a Linux xxxxxxxx2.6.32-042stab055.10 #1 SMP Thu May 10 15:38:32 MSD 2012 i686 i686 i386 GNU/Linux </code></pre> <p>I am trying to run the ecommerce system shopizer from the tomcat installed on it. I had tried to build it on the VPS but did not succeed so I built it else where and copied the war files on the VPS's tomcat.</p> <p>The issue I am facing now and during the build too was that the build was hanging when i ran the built ant scripts. now when i am launching the tomcat server whose details are as follows :</p> <pre><code>Server version: Apache Tomcat/6.0.35 Server built: Nov 28 2011 11:20:06 Server number: 6.0.35.0 OS Name: Linux OS Version: 2.6.32-042stab055.10 Architecture: i386 JVM Version: 1.6.0_24-b24 JVM Vendor: Sun Microsystems Inc. </code></pre> <p>the server hangs up at start and when I take thread dump (both in this case and the build case) I get the following :</p> <pre><code>"GC Daemon" daemon prio=10 tid=0xa09fd000 nid=0x36ef in Object.wait() [0xa08f7000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on &lt;0xa6c35a88&gt; (a sun.misc.GC$LatencyLock) at sun.misc.GC$Daemon.run(GC.java:117) - locked &lt;0xa6c35a88&gt; (a sun.misc.GC$LatencyLock) "Low Memory Detector" daemon prio=10 tid=0xb7686000 nid=0x36ed runnable [0x00000000] java.lang.Thread.State: RUNNABLE "C1 CompilerThread0" daemon prio=10 tid=0xb7684000 nid=0x36ec runnable [0x00000000] java.lang.Thread.State: RUNNABLE "Signal Dispatcher" daemon prio=10 tid=0xb7682800 nid=0x36eb waiting on condition [0x00000000] java.lang.Thread.State: RUNNABLE "Finalizer" daemon prio=10 tid=0xb7673000 nid=0x36ea in Object.wait() [0xa0ffe000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on &lt;0xa6ad0b58&gt; (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:133) - locked &lt;0xa6ad0b58&gt; (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:149) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:177) "Reference Handler" daemon prio=10 tid=0xb7671800 nid=0x36e9 in Object.wait() [0xa1198000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on &lt;0xa6ad0a58&gt; (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133) - locked &lt;0xa6ad0a58&gt; (a java.lang.ref.Reference$Lock) "main" prio=10 tid=0xb7605c00 nid=0x36e7 runnable [0xb775d000] java.lang.Thread.State: RUNNABLE at java.lang.Byte$ByteCache.&lt;clinit&gt;(Byte.java:79) at java.lang.Byte.valueOf(Byte.java:102) - waiting on &lt;0xa6ad0a58&gt; (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133) - locked &lt;0xa6ad0a58&gt; (a java.lang.ref.Reference$Lock) "main" prio=10 tid=0xb7605c00 nid=0x36e7 runnable [0xb775d000] java.lang.Thread.State: RUNNABLE at java.lang.Byte$ByteCache.&lt;clinit&gt;(Byte.java:79) at java.lang.Byte.valueOf(Byte.java:102) at com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter.&lt;init&gt;(DefaultTypeConverter.java:59) at com.opensymphony.xwork2.conversion.impl.XWorkConverter.&lt;init&gt;(XWorkConverter.java:186) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:532) at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:419) at com.opensymphony.xwork2.inject.ContainerBuilder$5.create(ContainerBuilder.java:207) at com.opensymphony.xwork2.inject.Scope$2$1.create(Scope.java:51) - locked &lt;0xa18cf408&gt; (a com.opensymphony.xwork2.inject.ContainerImpl) at com.opensymphony.xwork2.inject.ContainerImpl$ParameterInjector.inject(ContainerImpl.java:462) at com.opensymphony.xwork2.inject.ContainerImpl.getParameters(ContainerImpl.java:477) at com.opensymphony.xwork2.inject.ContainerImpl.access$000(ContainerImpl.java:34) at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:293) at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:431) at com.opensymphony.xwork2.inject.ContainerBuilder$5.create(ContainerBuilder.java:207) at com.opensymphony.xwork2.inject.Scope$2$1.create(Scope.java:51) - locked &lt;0xa18cf408&gt; (a com.opensymphony.xwork2.inject.ContainerImpl) at com.opensymphony.xwork2.inject.ContainerImpl$ParameterInjector.inject(ContainerImpl.java:462) at com.opensymphony.xwork2.inject.ContainerImpl.getParameters(ContainerImpl.java:477) at com.opensymphony.xwork2.inject.ContainerImpl.access$000(ContainerImpl.java:34) at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:293) at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:431) at com.opensymphony.xwork2.inject.ContainerBuilder$5.create(ContainerBuilder.java:207) at com.opensymphony.xwork2.inject.Scope$2$1.create(Scope.java:51) - locked &lt;0xa18cf408&gt; (a com.opensymphony.xwork2.inject.ContainerImpl) at com.opensymphony.xwork2.inject.ContainerImpl$ParameterInjector.inject(ContainerImpl.java:462) at com.opensymphony.xwork2.inject.ContainerImpl.getParameters(ContainerImpl.java:477) at com.opensymphony.xwork2.inject.ContainerImpl.access$000(ContainerImpl.java:34) at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:293) at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:431) at com.opensymphony.xwork2.inject.ContainerBuilder$5.create(ContainerBuilder.java:207) at com.opensymphony.xwork2.inject.Scope$2$1.create(Scope.java:51) - locked &lt;0xa18cf408&gt; (a com.opensymphony.xwork2.inject.ContainerImpl) at com.opensymphony.xwork2.inject.ContainerBuilder$3.create(ContainerBuilder.java:93) at com.opensymphony.xwork2.inject.ContainerBuilder$7.call(ContainerBuilder.java:487) at com.opensymphony.xwork2.inject.ContainerBuilder$7.call(ContainerBuilder.java:484) at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:574) at com.opensymphony.xwork2.inject.ContainerBuilder.create(ContainerBuilder.java:484) at com.opensymphony.xwork2.config.impl.DefaultConfiguration.createBootstrapContainer(DefaultConfiguration.java:252) at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:193) - locked &lt;0xa37c05b0&gt; (a com.opensymphony.xwork2.config.impl.DefaultConfiguration) .... .... .. "VM Thread" prio=10 tid=0xb766d800 nid=0x36e8 runnable "VM Periodic Task Thread" prio=10 tid=0xb7688400 nid=0x36ee waiting on condition JNI global references: 911 Heap def new generation total 39424K, used 5740K [0xa1580000, 0xa4040000, 0xa6ad0000) eden space 35072K, 12% used [0xa1580000, 0xa19a8e88, 0xa37c0000) from space 4352K, 34% used [0xa37c0000, 0xa3932570, 0xa3c00000) to space 4352K, 0% used [0xa3c00000, 0xa3c00000, 0xa4040000) tenured generation total 87424K, used 1432K [0xa6ad0000, 0xac030000, 0xb1580000) the space 87424K, 1% used [0xa6ad0000, 0xa6c36038, 0xa6c36200, 0xac030000) compacting perm gen total 12288K, used 11825K [0xb1580000, 0xb2180000, 0xb5580000) the space 12288K, 96% used [0xb1580000, 0xb210c588, 0xb210c600, 0xb2180000) No shared spaces configured. </code></pre> <p>What can I do to resolve the issue or is it a bug/issue with java running on VPS??</p> <p>B) the jvm sometimes crashes on the same VPS with the following error :</p> <pre><code>[root@xxxxxx ~]# java Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. [root@xxxxxx ~]# free total used free shared buffers cached Mem: 1155072 561320 593752 0 0 317124 -/+ buffers/cache: 244196 910876 Swap: 0 0 0 </code></pre> <p>Very strange to me, can anyone explain me this behaviour.</p>
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