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POWebLogic 10.3 with JDK 1.6_16 - hanging threads in Java Reflection
 

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  1. POWebLogic 10.3 with JDK 1.6_16 - hanging threads in Java Reflection
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    <p>We are having recurring Weblogic threads hanging for 600+ seconds, or sometimes only for 30 seconds (which is just as bad) in seemingly trivial Java Reflection operations.</p> <p>Thread dumps and WebLogic's own built-in alert on stuck thread all showing same native code, but no idea what could be causing it to hang for such long intervals (stuck thread below).</p> <p>I noticed that message comes up, which is weird as JDK itself is jdk160_16.</p> <p>This is on Solaris with Native I/O enabled, but maybe some other setting is wrong?</p> <p>Various threads have different earlier code, but the stuck section is always the same:</p> <pre><code>"[STUCK] ExecuteThread: '2' for queue: 'weblogic.kernel.Default (self-tuning)'" daemon prio=3 tid=0x01c2f000 nid=0x74 runnable [0x5bcfc000] java.lang.Thread.State: RUNNABLE at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389) at java.lang.Class.getConstructor0(Class.java:2699) at java.lang.Class.newInstance0(Class.java:326) at java.lang.Class.newInstance(Class.java:308) at sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:381) at java.security.AccessController.doPrivileged(Native Method) at sun.reflect.MethodAccessorGenerator.generate(MethodAccessorGenerator.java:377) at sun.reflect.MethodAccessorGenerator.generateMethod(MethodAccessorGenerator.java:59) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:28) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) </code></pre>
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    1. COUpdated with more complete top-line showing ExecuteThread title as well, not sure if that's any help in determining what's wrong.
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    2. COI can just say that lately this problem disappeared all on it's own. So it remains a mystery for now, but thanks everyone for trying.
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    3. COI have the same problem with jrockit on a 12c weblogic on linux.
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      1. USmnp
 

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