Undeploying a Grails App from Glassfish gets a Class invariant violation

I have a Grails application that runs in Glassfish but when I undeploy it gets a

Class invariant violation

A quick look at the stacktrace and search on the web reports that this is a problem with Log4j

I am using the latest log4j at the time log4j-1.2.16.jar

Any suggestions how to overcome this error.

[Mon, 22-Aug-2011 @ 09:23:32.494] [admin-thread-pool-4848(64)] ERROR javax.enterprise.system.std.com.sun.enterprise.server.logging - java.lang.IllegalStateException: Class invariant violation at org.apache.log4j.LogManager.getLoggerRepository(LogManager.java:199) at org.apache.log4j.LogManager.getLogger(LogManager.java:228) at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:73) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:243) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:255)

[Edit 1]

I have just found this on the spring source forum which is interesting:

The following are recommended to avoid this problem:

1. Set the org.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES system property to false.
2. Apply the patch from bug 40212 or upgrade to a version that has t开发者_JAVA百科hat patch applied.
3. Upgrade to log4j 1.2.16 or later to better defend against class loader attack or provide a better diagnostic message when it does occur.

[Solution] Setting the property

org.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES = false 

in the domain.xml file in Glassfish resolves the issue