I am having a similar problem with WebSphere 6.0 using the j4 distro (I had to retrotranslate the Sitemesh plugin). In my case, the NoClassDefFoundError was for org.apache.struts2.sitemesh.TemplatePageFilter, which per the docs is to be used in place of com.opensymphony.module.sitemesh.filter.PageFilter. When I use the regular Sitemesh PageFilter, the error goes away but I am unable to access the ActionContext. Since in my case as in yours the "missing" class files are indeed present, I think this is either a classloader issue or another error/exception that is being re-thrown for some reason as a NoClassDefFoundError. Does anyone have any insight as to why this might be happening?
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