I've run into an issue when using Seam and JBoss 4.2. I've followed the examples found on the forums, especially Gavin's guide to getting the booking example to work. http://www.jboss.com/index.html?module=bb&op=viewtopic&t=94738 When using JBoss 4.2RC1, I'm not getting a java.lang.NoClassDefFoundError: org/apache/commons/digester/Digester In the JBoss AS 4.0.5 release, the digester class was found in the jbossweb-tomcat55.sar\jsf-libs directory. But, is not found anywhere in the 4.2 structure. Here is the relavant stacktrace anonymous wrote : java.lang.NoClassDefFoundError: org/apache/commons/digester/Digester | at org.ajax4jsf.framework.resource.ResourceBuilderImpl.registerConfig(ResourceBuilderImpl.java:131) | at org.ajax4jsf.framework.resource.ResourceBuilderImpl.registerResources(ResourceBuilderImpl.java:216) | at org.ajax4jsf.framework.resource.ResourceBuilderImpl.(ResourceBuilderImpl.java:120) | at org.ajax4jsf.framework.resource.InternetResourceBuilder.getInstance(InternetResourceBuilder.java:156) | at org.ajax4jsf.framework.renderer.RendererBase.getResourceBuilder(RendererBase.java:136) | at org.ajax4jsf.framework.renderer.RendererBase.getResource(RendererBase.java:131) | at org.ajax4jsf.renderkit.html.AjaxFormRenderer.(AjaxFormRenderer.java:74) | at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) In fact, all the apache commons are gone. Is this a jar that needs to be included at the jboss level, or should I simply include it at the ear level? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4034277#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...