UnsupportedOperationException in WadlGenerator
----------------------------------------------

                 Key: CXF-2556
                 URL: https://issues.apache.org/jira/browse/CXF-2556
             Project: CXF
          Issue Type: Bug
            Reporter: Cyrille Le Clerc


UnsupportedOperationException when displaying the WADL.
STACKTRACE
===========
{noformat}
java.lang.UnsupportedOperationException
        java.util.AbstractCollection.add(AbstractCollection.java:221)
        java.util.AbstractCollection.addAll(AbstractCollection.java:305)
        org.apache.cxf.jaxb.JAXBUtils.scanPackages(JAXBUtils.java:811)
        
org.apache.cxf.jaxrs.model.wadl.WadlGenerator.createJaxbContext(WadlGenerator.java:498)
        
org.apache.cxf.jaxrs.model.wadl.WadlGenerator.handleRequest(WadlGenerator.java:123)
        
org.apache.cxf.jaxrs.impl.RequestPreprocessor.checkMetadataRequest(RequestPreprocessor.java:164)
        
org.apache.cxf.jaxrs.impl.RequestPreprocessor.preprocess(RequestPreprocessor.java:74)
        
org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.processRequest(JAXRSInInterceptor.java:87)
        
org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.handleMessage(JAXRSInInterceptor.java:63)
        
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:236)
        
org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:109)
        
org.apache.cxf.transport.servlet.ServletDestination.invoke(ServletDestination.java:98)
        
org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:394)
        
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:170)
        
org.apache.cxf.transport.servlet.AbstractCXFServlet.invoke(AbstractCXFServlet.java:142)
        
org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:179)
        
org.apache.cxf.transport.servlet.AbstractHTTPServlet.doGet(AbstractHTTPServlet.java:108)
{noformat}

CAUSE
======
{code:title=WadlGenerator.java}
public class WadlGenerator implements RequestHandler {
    
    public Response handleRequest(Message m, ClassResourceInfo resource) {
         ...
        Set<Class<?>> jaxbTypes = 
ResourceUtils.getAllRequestResponseTypes(cris, true).keySet(); <=== returned 
Set is readonly !
        JAXBContext context = createJaxbContext(jaxbTypes);   <=== 
createJaxbContext will try to add entries in the given Set()
    }
{code}


PROPOSED FIX
=============
* in createJaxbContext(), create a HashSet() initialized with the initial 
jaxbTypes
* add javadoc on JAXBUtils.scanPackages(classes, objectFactoryCache) to explain 
the given classes Set will be modified



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