0 Replies Latest reply on Jul 11, 2012 6:48 AM by Marco Trevisan

    Jaxb-impl in Guvnor's WEB-INF/lib

    Marco Trevisan Newbie

      Hi all,


      I've set up a JBoss AS 5.1 installation of Guvnor (5.3.1 GA) using the JBPM 5.2 installer (installed using the provided ANT script).

      After some usage of Guvnor and jbpm-console without apparent issues, jbpm-console becomes unable to communicate with Guvnor.


      Snippet of "server.log":


      2012-07-11 12:22:47,803 ERROR [STDERR] (http- java.lang.LinkageError: loader constraint violation: when resolving overridden method "com.sun.xml.bind.v2.runti
      me.MarshallerImpl.marshal(Ljava/lang/Object;Ljavax/xml/stream/XMLStreamWriter;)V" the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) of the curren
      t class, com/sun/xml/bind/v2/runtime/MarshallerImpl, and its superclass loader (instance of <bootloader>), have different Class objects for the type javax/xml/stream/XMLStre
      amWriter used in the signature
      2012-07-11 12:22:47,809 ERROR [STDERR] (http-    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.createMarshaller(JAXBContextImpl.java:772)
      2012-07-11 12:22:47,809 ERROR [STDERR] (http-    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.createMarshaller(JAXBContextImpl.java:141)
      012-07-11 12:22:47,825 INFO  [STDOUT] (http- 12:22:47,825 ERROR [GuvnorConnectionUtils] Error retriving packages from guvnor: ParseError at [row,col]:[2,1]
      Message: XML document structures must start and end within the same entity.
      2012-07-11 12:22:47,847 INFO  [STDOUT] (http- 12:22:47,847 INFO  [GuvnorConnectionUtils] Did not find process image for: com.sample.evaluation
      2012-07-11 12:22:47,847 INFO  [STDOUT] (http- 12:22:47,847 ERROR [GraphViewerPluginImpl] Could not get diagram url from Guvnor: null



      Now, since jaxb is part of the JRE since version 1.6.0_04, I guess some other webapp triggered bootloader classloading of MarshallerImpl.

      I removed jaxb-impl- from the WEB-INF/lib folder of drools-guvnor and now it appears to run without problems.


      Wouldn't it be better to remove jaxb-impl from WEB-INF/lib in guvnor distribution wars? Do I miss something?


      Thanks in advance, regards.