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Monday Jan 30, 2012

GlassFish / Jersey Exception "java.lang.IllegalArgumentException: object is not an instance of declaring class" And Solution

The exception:


SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container
java.lang.IllegalArgumentException: object is not an instance of declaring class
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
	at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
	at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
	at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
	at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
	[…]

is caused by exposing EJB 3.1 methods directly via REST without having a no-interface view declared. This happens when your EJB 3.1 REST-endpoint implements an additional interface without declaring the no-interface view:


import javax.ejb.*;

@Path("RESTafari)
@Singleton
public class RESTEndpoint implements SomeLocalInterface{}

Adding a @LocalBean annotation (and activating the no-interface view) solves the problem:


import javax.ejb.*;

@LocalBean
@Path("RESTafari)
@Singleton
public class RESTEndpoint implements SomeLocalInterface{}

Posted at 09:22AM Jan 30, 2012 by Adam Bien in Real World Java EE Patterns - Rethinking Best Practices | Comments[1] | Views/Hits: 1736

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Comments:

This is indeed very discouraging. I faced the same problem when working with local EJB - the simple stateless bean implementing some non-ejb interface must be annotated with @LocalBean to provide the possibility to inject bean through CDI. The exception was non-intuitive and it took long time for me to get the reason. As I saw in weld forum Gavin King was too sorry about this as he was against such additional actions and wanted to avoid additional annotations in this case.

Posted by Anton on February 01, 2012 at 08:27 AM CET #