[jbossseam-issues] [JBoss JIRA] Created: (JBSEAM-3758) NoClassDefFoundError: org/jboss/seam/intercept/Proxy when Seam Component is an EJB in another module

Andre Rodrigues (JIRA) jira-events at lists.jboss.org
Tue Nov 25 12:40:36 EST 2008

NoClassDefFoundError: org/jboss/seam/intercept/Proxy when Seam Component is an EJB in another module

                 Key: JBSEAM-3758
                 URL: https://jira.jboss.org/jira/browse/JBSEAM-3758
             Project: Seam
          Issue Type: Bug
          Components: Core
    Affects Versions: 2.1.0.SP1, 2.1.0.GA
         Environment: JBoss AS 4.2.2, Seam 2.0.2.GA, 2.0.2.SP1, 2.1.0.GA, 2.1.0.SP1
            Reporter: Andre Rodrigues

I have all my backing beans in the web application (java bean components). My business logic is inside EJBs in a module which has no reference to Seam whatsoever. So, the EAR class loader has no reference to Seam classes, Seam's jar are only in my web application (WEB-INF/lib).
After some debugging, I saw that seam (2.0.2.SP1) passes an Array of interfaces to the ProxyFactory class. ProxyFactory gets the ClassLoader from the first class in the array. When the first class in the array is either Proxy or Instance, everything works fine. When the EJB interface is the first element on the array (happens after a few restarts of JBoss), ProxyFactory gets its ClassLoader, the EAR ClassLoader, which, as metioned before, doesn't "know" about Seam.

I think a simple solution would be change the method createProxyFactory in the Component class to the following:

    Set<Class> interfaces = new TreeSet<Class>(); // instead of a HashSet, to guarantee the order of the elements
    // so these classes the first elements on the array
    if ( type.isSessionBean() )
    ProxyFactory factory = new ProxyFactory();
    // excluding this part, which was included in 2.1.0, but didn't really solved the problem
       protected ClassLoader getClassLoader()
          return beanClass.getClassLoader();

A full description of the problem can be found at the forum location below.

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