http://jira.hyperic.com/browse/HHQ-4122
The agent includes xalan.jar to allow for xpath queries when auto-discovering WebSphere. As part of HHQ-2417 Xalan was upgraded to 2.7.1. In that release code related to serialization of output result trees was pulled out of xalan.jar and moved into a new jar file, named serializer.jar.
Since xalan is now in pdk/lib, other custom plugins can choose to use it, however if the plugin is reliant at all on the serialization code it will break with a class not found exception.
Fix is one of:
1) Move xalan.jar from pdk/lib to within the Websphere plugin if it is the only thing using this. This would force any 3-rd party plugin which uses Xalan to bundle their own jars in the plugin
or
2) Add serializer.jar into pdk/lib
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