BTM Bug 22003306 - OSB Observer blocking/lock contention at java.lang.ClassLoader.loadClass

(Doc ID 2098510.1)

Last updated on SEPTEMBER 20, 2016

Applies to:

APM - Application Performance Management - Version 12.1.0.4.0 to 12.1.0.7.0 [Release 12.1]
Information in this document applies to any platform.

Symptoms

OSB server has multiple BLOCKED threads from the BTM observer that was trying to load the same class, thus causing lock contention.

"[ACTIVE] ExecuteThread: '243' for queue: 'weblogic.kernel.Default
(self-tuning)'" daemon prio=3 tid=0x000000011d578800 nid=0x183 waiting for monitor entry [0xfffffffd7f7fb000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.ClassLoader.loadClass(ClassLoader.java:405)
- waiting to lock <0xfffffffdf300bd90> (a
weblogic.utils.classloaders.GenericClassLoader)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:179)
at com.amberpoint.xerces24.org.apache.xerces.util.ObjectFactory.findProviderClass(ObjectFactory.java:403)
at com.amberpoint.xerces24.org.apache.xerces.util.ObjectFactory.newInstance(ObjectFactory.java:354)
at com.amberpoint.xerces24.org.apache.xerces.impl.dv.DTDDVFactory.getInstance(DTDDVFactory.java:99)
at com.amberpoint.xerces24.org.apache.xerces.impl.dv.DTDDVFactory.getInstance(DTDDVFactory.java:84)
at com.amberpoint.xerces24.org.apache.xerces.parsers.DTDConfiguration.createDatatypeValidatorFactory(DTDConfiguration.java:868)
atcom.amberpoint.xerces24.org.apache.xerces.parsers.DTDConfiguration.<init>(DTDConfiguration.java:415)
...

at com.amberpoint.nanoagent.esb.osb11g.messages.MessageContentHelper$GetOperationSaxHandler.parse(MessageContentHelper.java:238)
at com.amberpoint.nanoagent.esb.osb11g.messages.MessageContentHelper$GetOperationSaxHandler.getOperationName(MessageContentHelper.java:229)
at com.amberpoint.nanoagent.esb.osb11g.messages.MessageContentHelper.getOperationFromContent(MessageContentHelper.java:168)
...

Cause

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