[jboss-dev-forums] [Design of JBossXB] - Marshalling an AbstractKernelDeployment

[flavia.rainone@jboss.com]

I've been trying to marshal an AbstractKernelDeployment without success:

      AbstractKernelDeployment deployment = new AbstractKernelDeployment();
  |       AbstractBeanMetaData beanMetaData = new AbstractBeanMetaData();
  |       beanMetaData.setBean(Test.class.getName());
  |       beanMetaData.setName("test");
  |       List<BeanMetaDataFactory> beanFactories = new ArrayList<BeanMetaDataFactory>();
  |       beanFactories.add(beanMetaData);
  |       deployment.setBeanFactories(beanFactories);
  |       MarshallerImpl marshaller = new MarshallerImpl();
  |       SchemaBindingResolver resolver = SingletonSchemaResolverFactory.getInstance().getSchemaBindingResolver();
  |       marshaller.setSchemaResolver(resolver);
  |       StringWriter writer = new StringWriter();
  |       
  |       URL url = Test.class.getClassLoader().getResource("schema/bean-deployer_2_0.xsd");
  |       
  |       marshaller.marshal(url.toString(), null, deployment, writer);

I'm getting this exception:

Exception in thread "main" org.jboss.xb.binding.JBossXBRuntimeException: Missing value for the required attribute bean of element {urn:jboss:bean-deployer:2.0}lazy
  | 	at org.jboss.xb.binding.sunday.marshalling.DefaultAttributeMarshaller.marshalValue(DefaultAttributeMarshaller.java:89)
  | 	at org.jboss.xb.binding.sunday.marshalling.AbstractAttributeMarshaller.marshal(AbstractAttributeMarshaller.java:39)
  | 	at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalComplexType(MarshallerImpl.java:547)
  | 	at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalElementType(MarshallerImpl.java:430)
  | 	at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalElement(MarshallerImpl.java:329)
  | 	at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalElementOccurence(MarshallerImpl.java:309)
  | 	at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshallInternal(MarshallerImpl.java:215)
  | 	at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshal(MarshallerImpl.java:150)
  | 	at org.jboss.microcontainer.tools.Test.main(Test.java:69)

Debugging the code, I see that MarshallerImpl (lines 211-216) marshals the deployment by iterating through the ElementBindings and marshalling the ocurrences of each of one those elements:

while(elements.hasNext())
  |          {
  |             ParticleBinding element = elements.next();
  |             ctx.particle = element;
  |             marshalElementOccurence((ElementBinding) element.getTerm(), root, true, true);
  |          }

It seems that at some point, between the marshalElementOcurrence() call and the execution of marshalComplexType(), MarshallerImpl assumes that the element at the stack is a lazy element instead of a deployment element. Given that it isn't, MarshallerImpl fails to find the value of the mandatory bean attribute of lazy and throws the exception above.

Taking a look at XsdBinder (lines 476-483), I see that it binds the schema elements with a minOcurrences of 1:

XSNamedMap elements = model.getComponents(XSConstants.ELEMENT_DECLARATION);
  |       if (trace)
  |          log.trace("Model elements: " + types.getLength());
  |       for(int i = 0; i < elements.getLength(); ++i)
  |       {
  |          XSElementDeclaration element = (XSElementDeclaration)elements.item(i);
  |          bindElement(element, 1, 0, false);
  |       }

I'm not sure if this has something to do with the problem or not, but it looks weird from my point of view.

So, am I doing this the wrong way? Or is this a bug?

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