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From "Andrzej Michalec (JIRA)" <j...@apache.org>
Subject [jira] Created: (CXF-1982) Sub-resource locator fails on subtyping
Date Thu, 15 Jan 2009 03:05:59 GMT
Sub-resource locator fails on subtyping
---------------------------------------

                 Key: CXF-1982
                 URL: https://issues.apache.org/jira/browse/CXF-1982
             Project: CXF
          Issue Type: Bug
          Components: JAX-WS Runtime
    Affects Versions: 2.1.3, 2.2
            Reporter: Andrzej Michalec


Attempt to use subresource locator with subtyping lead to following problem:

2009-01-15 03:31:28 org.apache.cxf.jaxrs.JAXRSServiceFactoryBean checkMethodDispatcher
WARNING: No resource methods found for resource class org.apache.cxf.jaxrs.model.ClassResourceInfo
2009-01-15 03:31:28 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry
destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1891d5d:
defining beans [cxf,org.apache.cxf.bus.spring.BusApplicationListener,org.apache.cxf.bus.spring.BusWiringBeanFactoryPostProcessor,org.apache.cxf.bus.spring.Jsr250BeanPostProcessor,org.apache.cxf.bus.spring.BusExtensionPostProcessor,org.apache.cxf.resource.ResourceManager,org.apache.cxf.configuration.Configurer,org.apache.cxf.binding.BindingFactoryManager,org.apache.cxf.transport.DestinationFactoryManager,org.apache.cxf.transport.ConduitInitiatorManager,org.apache.cxf.wsdl.WSDLManager,org.apache.cxf.phase.PhaseManager,org.apache.cxf.workqueue.WorkQueueManager,org.apache.cxf.buslifecycle.BusLifeCycleManager,org.apache.cxf.endpoint.ServerRegistry,org.apache.cxf.endpoint.ServerLifeCycleManager,org.apache.cxf.endpoint.ClientLifeCycleManager,org.apache.cxf.transports.http.QueryHandlerRegistry,org.apache.cxf.endpoint.EndpointResolverRegistry,org.apache.cxf.headers.HeaderManager,org.apache.cxf.catalog.OASISCatalogManager,org.apache.cxf.endpoint.ServiceContractResolverRegistry,org.apache.cxf.transport.servlet.ServletTransportFactory,org.apache.cxf.jaxrs.JAXRSBindingFactory,jaxRsServer];
root of factory hierarchy
2009-01-15 03:31:28 org.springframework.web.context.ContextLoader initWebApplicationContext
SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jaxRsServer':
Error setting property values; nested exception is org.springframework.beans.PropertyBatchUpdateException;
nested PropertyAccessExceptions (1) are:
PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property 'serviceBeans'
threw exception; nested exception is java.lang.NullPointerException
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1278)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1010)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:472)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:221)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:729)
... 


To reproduces on CXF 2.2 use following code snippet (it also fails in CXF 2.1.3-stable using
@ProduceMime):

@Produces("text/xml")
public class RootService {

	@GET
	@Path("/")
	public String getThis() {
		return "<root>Root service</root>";
	}

	//@GET disabled to delegate to sub-resource
	//when SubService is returned it works fine
	//when java.lang.Object is returned it FAILS with Spring autowiring... weird
	@Path("/sub")
	public SubService getSub() {
		return new SubService();
	}
}
-------------
@Produces("text/xml")
@XmlRootElement
public class SubService {

	private String value = "sub value";
	
	@GET
	public Object getThis() {
		return this;
	}

	@GET
	@Path("/value")
	public String getValue() {
		return value;
	}
}

I believe JAX-RS specification clearly points out that
"[...]implementation MUST dynamically determine the class of object returned rather than relying
on the static sub-resource locator return type since the returned instance may be a subclass
of the declared type with potentially different annotations[...]"

As reference see Jboss example returning java.lang.Object from locator: http://www.jboss.org/file-access/default/members/resteasy/freezone/docs/1.0-beta-7/userguide/html/JAX-RS_Resource_Locators_and_Sub_Resources.html

If there are some assumed limitation please provide workarounds for dynamic subresources.

(Side note: effective behavior is very similar to CXF-1762 suffering from method dispatching
problems; maybe solution is similar).

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