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.defaultlistablebeanfact...@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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