[CXF-2234] Unmarshalling with JAXB of a method that is defined in an inherited interface results in an NPE exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.2
• Fix Version/s: 2.2.2
• Component/s: JAXB Databinding, Soap Binding

Environment

WindowsXP-SP3, Eclipse 3.4

• Assignee: Unassigned
• Reporter: Tom
• Created: 22/May/09 09:42
• Updated: 16/Jun/09 12:52
• Resolved: 16/Jun/09 12:52

Description

The UserService:

@javax.jws.WebService
public interface UserService extends AbstractService<User, Users>
{
}

The AbstractService:

@javax.jws.WebService
public interface AbstractService<T, Ts>
{
public Ts list();
}

The UserServiceImpl:

@javax.jws.WebService(endpointInterface = "nl.knowledgeplaza.profiler.services.UserService", serviceName = "users") // the "ws" prefix is handled by the container
public class UserServiceImpl
implements UserService
{
public Users list()
{
try
{
if (slf4j.isDebugEnabled()) slf4j.debug("list User");

// find all
List<User> lList = User.findAll();
if (slf4j.isDebugEnabled()) slf4j.debug("list User size={}", lList.size());

// create a collection so JAXB knows what to do
Users lUsers= new Users(lList);

// done
return lUsers;
}
catch (RuntimeException e)

{ slf4j.error(ExceptionUtil.describe(e), e); throw e; }

}
}

UnitTests start the SOAP end point as follows:

javax.xml.ws.Endpoint.publish(cWSUserAddress, new UserServiceImpl());

The unittest:

@org.junit.Test
public void listUsersSOAP()

{ // create a proxy to the service JaxWsProxyFactoryBean factory = new JaxWsProxyFactoryBean(); factory.getInInterceptors().add(new LoggingInInterceptor()); factory.getOutInterceptors().add(new LoggingOutInterceptor()); factory.setServiceClass(UserService.class); factory.setAddress(cWSUserAddress); UserService lUserService = (UserService)factory.create(); // make the call Users lUsers = lUserService.list(); // check it org.fest.assertions.Assertions.assertThat( lUsers.getUser().size() ).isGreaterThan(0); }

The call arrives serverside, the code is correctly executed and 4 User entities have been fetched from the database. The JAXB marshalling then runs into problems, resulting in a value of null being returned on the clients side, and failing the unittest on a NPE.

The trace:

May 22, 2009 11:29:00 AM org.apache.cxf.interceptor.LoggingOutInterceptor$LoggingCallback onClose
INFO: Outbound Message
---------------------------
ID: 2
Address: http://localhost:9000/ws/user
Encoding: UTF-8
Content-Type: text/xml
Headers:

{SOAPAction=[""], Accept=[*/*]}

Payload: <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><ns1:list xmlns:ns1="http://services.profiler.knowledgeplaza.nl/" /></soap:Body></soap:Envelope>
--------------------------------------
[33299971@qtp-22864463-1] 2009-05-22 11:29:06,296 DEBUG nl.knowledgeplaza.profiler.services.UserServiceImpl.list(UserServiceImpl.java:48) list User
[EL Fine]: 2009-05-22 11:29:07.093-ServerSession(15545028)Connection(13749345)Thread(Thread[33299971@qtp-22864463-1,5,main])-SELECT id, username, middlename, email, lastname, callname, firstname, version FROM KP_USER
[33299971@qtp-22864463-1] 2009-05-22 11:29:08,750 DEBUG nl.knowledgeplaza.profiler.services.UserServiceImpl.list(UserServiceImpl.java:52) list User size=4
May 22, 2009 11:29:11 AM org.apache.cxf.phase.PhaseInterceptorChain doIntercept
INFO: Interceptor has thrown exception, unwinding now
org.apache.cxf.interceptor.Fault: Marshalling Error: class nl.knowledgeplaza.profiler.services.support.Users nor any of its super class is known to this context.
at org.apache.cxf.jaxb.JAXBEncoderDecoder.marshall(JAXBEncoderDecoder.java:159)
at org.apache.cxf.jaxb.io.DataWriterImpl.write(DataWriterImpl.java:169)
at org.apache.cxf.interceptor.AbstractOutDatabindingInterceptor.writeParts(AbstractOutDatabindingInterceptor.java:105)
at org.apache.cxf.interceptor.BareOutInterceptor.handleMessage(BareOutInterceptor.java:68)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:236)
at org.apache.cxf.interceptor.OutgoingChainInterceptor.handleMessage(OutgoingChainInterceptor.java:74)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:236)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:89)
at org.apache.cxf.transport.http_jetty.JettyHTTPDestination.serviceRequest(JettyHTTPDestination.java:302)
at org.apache.cxf.transport.http_jetty.JettyHTTPDestination.doService(JettyHTTPDestination.java:265)
at org.apache.cxf.transport.http_jetty.JettyHTTPHandler.handle(JettyHTTPHandler.java:70)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:880)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:747)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)
Caused by: javax.xml.bind.MarshalException

• with linked exception:
  [javax.xml.bind.JAXBException: class nl.knowledgeplaza.profiler.services.support.Users nor any of its super class is known to this context.]
  at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:328)
  at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:254)
  at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:75)
  at org.apache.cxf.jaxb.JAXBEncoderDecoder.writeObject(JAXBEncoderDecoder.java:441)
  at org.apache.cxf.jaxb.JAXBEncoderDecoder.marshall(JAXBEncoderDecoder.java:138)
  ... 21 more
  Caused by: javax.xml.bind.JAXBException: class nl.knowledgeplaza.profiler.services.support.Users nor any of its super class is known to this context.
  at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:242)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:257)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:649)
  at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:151)
  at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:185)
  at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeBody(ElementBeanInfoImpl.java:305)
  at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:312)
  at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:71)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:490)
  at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:325)
  ... 25 more
  Caused by: javax.xml.bind.JAXBException: class nl.knowledgeplaza.profiler.services.support.Users nor any of its super class is known to this context.
  at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getBeanInfo(JAXBContextImpl.java:566)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:644)
  ... 32 more
  May 22, 2009 11:29:12 AM org.apache.cxf.interceptor.LoggingInInterceptor logging
  INFO: Inbound Message
  ----------------------------
  ID: 2
  Encoding: UTF-8
  Content-Type: text/xml; charset=utf-8
  Headers: {content-type=[text/xml; charset=utf-8], Content-Length=[415], Server=[Jetty(6.1.15)]}

  Payload: <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><ns1:listResponse xmlns:ns1="http://services.profiler.knowledgeplaza.nl/"><soap:Fault><faultcode>soap:Server</faultcode><faultstring>Marshalling Error: class nl.knowledgeplaza.profiler.services.support.Users nor any of its super class is known to this context.</faultstring></soap:Fault></ns1:listResponse></soap:Body></soap:Envelope>
  --------------------------------------

The Users class is just a collection workaround as suggested in CXF's documentation:

@XmlRootElement(name = "users")
public class Users
implements Serializable
{
public Users()

{ setUser(new ArrayList<User>()); }

// upon JAXB unmarshalling of an empty collection, the setUser is NOT called and the collection would be null instead of empty
public Users(Collection<User> c)

{ setUser(c); }

private Collection<User> iCollection;
public Collection<User> getUser()

{ return iCollection; }

public void setUser(Collection<User> c)

{ iCollection = c; }

public List<User> asList()

{ return new ArrayList<User>(iCollection); }

}