LinkageError whilst trying to invoke CXF/SOAP webservice

Question

I have a project (say myproject) in which I have hosted a CXF RESTful service and CXF WS/SOAP service, and running on JBoss (6.0.0.FINAL). The RESTful interface is used by all of our internal systems, and the SOAP interface is used by the third party systems (as a callback interface)

Following URLs are working fine.

• REST URL: http://localhost:8080/myproject/internal/someOperation (content-type: application/json and POST body)

• SOAP WSDL: http://localhost:8080/myproject/cbsoap?wsdl

Now my problem is that actual SOAP calls are not successful. I use SOAPUI to try the SOAP calls but just to able to query the WSDL. I am getting the following error:-

javax.servlet.ServletException: Servlet execution threw an exception
    org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:67)

root cause

java.lang.LinkageError: loader constraint violation: when resolving overridden method "org.apache.cxf.jaxb.attachment.JAXBAttachmentUnmarshaller.getAttachmentAsDataHandler(Ljava/lang/String;)Ljavax/activation/DataHandler;" the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) of the current class, org/apache/cxf/jaxb/attachment/JAXBAttachmentUnmarshaller, and its superclass loader (instance of ), have different Class objects for the type r used in the signature
    org.apache.cxf.jaxb.JAXBDataBase.getAttachmentUnmarshaller(JAXBDataBase.java:78)
    org.apache.cxf.jaxb.io.DataReaderImpl.createUnmarshaller(DataReaderImpl.java:123)
    org.apache.cxf.jaxb.io.DataReaderImpl.read(DataReaderImpl.java:156)
    org.apache.cxf.interceptor.DocLiteralInInterceptor.handleMessage(DocLiteralInInterceptor.java:109)
    org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)
    org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
    org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:207)
    org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:209)
    org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:191)
    org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:114)
    org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:185)
    org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:108)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
    org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:164)
    org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:67)

Answer 1

LinkageError is JBoss is generally caused by your app packaging its own copies of certain libraries that JBoss considers restricted. These are usually things in the java.* and javax.* packages.

Looking at your stack trace, I'd guess that the culprit is javax.activation.DataHandler. Check your app's bundled JAR files, make sure there's nothing like that in them. If there is, then remove it.

It may not be javax.activation.DataHandler, but may be something it in turn depends on.