RestEasy+EJB in JBoss 7, here @Inject throws Null Pointer Exception

[Sachin Pachari]

hi guys,

i am new to this whole web service, i am stuck with this JAXRS(RestEasy) project where i have to integrate my EJB with the Service and i am not able to @Inject or @EJB, everytime i try to inject, i get a Null Pointer Exeption, i have been Searching in google to solve this issue,

i have tried all the possible solutions. like adding @Stateless, adding Beans.xml to my META-INF and also configuring RestEasy CDI Injector Factory in my Web.xml

But no use, i am using JBoss AS 7.0, i keep on getting null pointer, is it even possible to inject any object into my (JAX-RS) Web Services ?? Someone please help me, i have been stuck in this point for more than a week. Someone Please Explain me clearly about this.

Any Kind of help is welcome.

Thanks & Regards,
Sachin

[timo erler]

maybe the following works for you

web.xml

       <context-param>
		<param-name>resteasy.servlet.mapping.prefix</param-name>
		<param-value>/rest</param-value>
	</context-param>

	<servlet>
		<servlet-name>Resteasy</servlet-name>
		<servlet-class>
                org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
                </servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>Resteasy</servlet-name>
		<url-pattern>/rest/*</url-pattern>
	</servlet-mapping>
	<context-param>
		<param-name>javax.ws.rs.Application</param-name>
		<param-value>de.resteasy.MyApplication</param-value>
	</context-param>
	<listener>
		<listener-class>
                org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
                </listener-class>
	</listener>

MyApplication.java

package de.resteasy;

import java.util.HashSet;
import java.util.Set;

import javax.ws.rs.core.Application;

public class MyApplication extends Application {

	private Set<Object> resourceObjects = new HashSet<Object>();
	private Set<Class<?>> resourceClasses = new HashSet<Class<?>>();

	public FunctionalApplication() {
		resourceClasses.add(MyResource.class);
	}
	@Override
	public Set<Class<?>> getClasses() {
		return resourceClasses;
	}
	@Override
	public Set<Object> getSingletons() {
		return resourceObjects;
	}
}

MyResource.java is a RootResource which injetcs a Singleton-Bean containing an EntityManager.




This works for me as long as i do not work with subclasses

        @Path("/mypath")
	public MySubResource getMySubResource() {
		return new MySubResource();
	}

MySubResource injects the Singleton-Bean. Now I get the NullpointerException again.

Anyone an idea?

[timo erler]

i solved the problem with subresources...

my resource is a bean
my subresource is a bean

so is use the following code to get my subresource-bean

@Inject
private MySubresource mySubResource;

 @Path("/mypath")  
    public MySubResource getMySubResource() {  
        return mySubResource;  
    } 

all in all it was an stupid mistake, because beans are beans and managed by container ;)