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  1. Weld
  2. WELD-2521

NullPointerException using Stateless with configured interceptors

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      you can start the test case from github https://github.com/flashboss/interceptors-bug on the master branch. So execute by console:

      git clone https://github.com/flashboss/interceptors-bug
      mvn test

      Show
      you can start the test case from github https://github.com/flashboss/interceptors-bug on the master branch. So execute by console: git clone https://github.com/flashboss/interceptors-bug mvn test
    • Workaround Exists
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      Do not declare the OKInterceptor in beans.xml.
      According to spec, interceptors declared via @Interceptors annotation do not require this for activation anyway. Hence the interceptor will still get invoked and the error will disappear.

      Show
      Do not declare the OKInterceptor in beans.xml . According to spec, interceptors declared via @Interceptors annotation do not require this for activation anyway. Hence the interceptor will still get invoked and the error will disappear.

      I report a strange behavior on WildFly 13 when configuring interceptors within stateless. Below I describe the scenario:

      Here a simple interceptor:

      package it.vige.injection.interceptors;

import javax.interceptor.AroundInvoke;
import javax.interceptor.Interceptor;
import javax.interceptor.InvocationContext;

@Interceptor
public class OKInterceptor {

	@AroundInvoke
	public Object aroundInvoke(InvocationContext ic) throws Exception {
		return ic.proceed();
	}
}

      Here an annotation used as interceptor binding:

      package it.vige.injection.interceptors;

import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import javax.interceptor.InterceptorBinding;

@Retention(RUNTIME)
@Target({ METHOD, TYPE, CONSTRUCTOR })
@InterceptorBinding
public @interface NotOK {

}

      Here an interceptor annotated with the interceptor binding:

      package it.vige.injection.interceptors;

import javax.interceptor.AroundInvoke;
import javax.interceptor.Interceptor;
import javax.interceptor.InvocationContext;

@Interceptor
@NotOK
public class NotOKInterceptor {

	@AroundInvoke
	public Object aroundInvoke(InvocationContext ic) throws Exception {
		return ic.proceed();
	}
}

      Here the stateless service configured with both the interceptors:

      package it.vige.injection.interceptors;

import javax.ejb.Stateless;
import javax.interceptor.Interceptors;

@Stateless
public class SimpleService {

	@Interceptors({ OKInterceptor.class })
	public void ok() {
	}

	@NotOK
	public void notOk() {
	}

}

      This service must have two methods, one attached to the simple interceptor and the other attached to the interceptor binding.

      Here the beans.xml configuration:

      <beans xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                           http://xmlns.jcp.org/xml/ns/javaee/beans_2_0.xsd"
	version="2.0" bean-discovery-mode="all">
	<interceptors>
		<class&gt;it.vige.injection.interceptors.OKInterceptor</class&gt;
		<class&gt;it.vige.injection.interceptors.NotOKInterceptor</class&gt;
	</interceptors>
</beans>

      And in the end the client who call the service:

      ....
	@Inject
	private SimpleService simpleService;

...
        // this call works:
        simpleService.ok();

        // this call starts a NullPointerException:
        simpleService.notOk();
...

      when I try to call the notOk method I get this exception:

      javax.ejb.EJBException: java.lang.NullPointerException
at deployment.test.war//it.vige.injection.test.InterceptorsTestCase.testNotOk(InterceptorsTestCase.java:52)
Caused by: java.lang.NullPointerException
at deployment.test.war//it.vige.injection.test.InterceptorsTestCase.testNotOk(InterceptorsTestCase.java:52)

      The same thing was tested on WildFly 11.0.0.Final and it was ok.
      If on WildFfly 13.0.0.Final I remove the @Stateless annotation from the service it works

              manovotn Matěj Novotný
              luca.stancapiano@vige.it Luca Stancapiano (Inactive)
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                Created:
                Updated:
                Resolved: