WebLogic Server: Getting "Invalid class loader hierarchy" Exceptions During Deployment (Doc ID 1327380.1)

Last updated on NOVEMBER 05, 2016

Applies to:

Oracle Weblogic Server - Version 9.2 and later
Information in this document applies to any platform.
***Checked for relevance on 21-Nov-2012***

Symptoms

In WebLogic Server, getting below "Invalid class loader hierarchy" exception with "more than one version of class" error message was reported. Below is exception trace in logs at the time of the issue. In this example, "org.apache.commons.logging.LogConfigurationException" is the class which is throwing the "Invalid class loader hierarchy" exception, but this exception can be caused by any class.

<Error> <Deployer> <testing.oracle.com> <testing_server> <[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)'> <> <> <> <1306973889417> <BEA-149265> <Failure occurred in the execution of deployment request with ID '1306973881366' for task '34'. Error is: 'org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.'
org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:385)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
at org.hibernate.ejb.Ejb3Configuration.<clinit>(Ejb3Configuration.java:103)

Cause

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