I'm trying to deploy a JBPM 3.2.2 process into JBoss AS 7 using Seam and I get this exception

ERROR [org.jbpm.jpdl.xml.JpdlXmlReader] (ServerService Thread Pool -- 69) couldn't parse process definition: org.dom4j.DocumentException: null Nested exception: null

after debugging I realized in org.jbpm.graph.def.ProcessDefinition.java

public static ProcessDefinition parseXmlResource(String xmlResource) {
    InputStream resourceStream = ClassLoaderUtil.getStream(xmlResource); // this line returns null
    
  }

but when I run it outside of container it runs successfully does anyone know how to fix this ?