CXFHandlerResolverImpl not threadsafe ------------------------------------- Key: JBWS-3985 URL: https://issues.jboss.org/browse/JBWS-3985 Project: JBoss Web Services Issue Type: Bug Components: jbossws-cxf Affects Versions: jbossws-cxf-5.0.0.Final Reporter: Bjørn Hilstad Assignee: Alessio Soldano Fix For: jbossws-cxf-5.1.4.Final When the concurrency of handler-chain parsing increases , the following error shows up in the logs: Caused by: org.xml.sax.SAXException: FWK005 parse may not be called while parsing. at org.apache.xerces.parsers.DOMParser.parse(DOMParser.java:260) at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:298) at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:121) at org.jboss.wsf.stack.cxf.client.serviceref.CXFHandlerResolverImpl.createHandlerChain(CXFHandlerResolverImpl.java:161) ... 132 more One case where I have seen this is when an EJB/MDB uses @WebServiceRef and @HandlerChain to get a reference to a webservice. When multiple instances of the EJB/MDB are created at the same time to handle a lot of messages this happens. It is the @HandlerChain that triggers the xml parsing and gives the error. The Xerces DocumentBuilder is not threadsafe and thus requires code to synchronize it correctly.