David Erickson wrote:
java.lang.LinkageError: loader (instance of
org/apache/catalina/loader/WebappClassLoader): attempted  duplicate
class definition for name: "com/x/y/ZAction"

I believe this error is thrown when there's more than one version of the .class available in the classpath. Are you sure that you don't have more than one .jar in your WEB-INF/lib that defines more than one version of this class? I'd guess that there was an undeployment issue and not all the jars got removed before redeploying the new war. When upgrading to 2.1.6 I had to delete the whole deployment directory when the app server was off in order to clean out the old .jars.

-Dale

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