Instead of patching the NPE, try upgrading server/all/lib/jgroups.jar to JGroups version
2.2.8 or later. See
http://labs.jboss.com/portal/jbosscache/compatibility/index.html for
version compatibility info.
In 2.2.7, the default version in most AS releases over the last couple years, TUNNEL has
no support for additional_data.
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