How can EJBs use spring boot beans?

Question

Using the idea that we found in:

http://docs.spring.io/spring/docs/current/spring-framework-reference/html/ejb.html#ejb-implementation-ejb3

we wanted to use interceptor in order to access spring boot beans from an EJBs. But the problem is, the example of the documentation uses a new context.

How can the EJBs access the spring boot context?

We tried this:

public class MySpringActuatorMetricsCoreTestInterceptor extends SpringBeanAutowiringInterceptor {

        //Spring boot application context
    @Autowired
    ApplicationContext applicationContext;

    @SuppressWarnings("resource")
    @Override
    protected BeanFactory getBeanFactory(Object target) {
        return applicationContext.getAutowireCapableBeanFactory();
    }

}

And the EBJ looks like this:

// ejb
@Stateless
// spring
@Interceptors(MySpringActuatorMetricsCoreTestInterceptor.class)
public class FirstBean {
[...]

The problem is: application context is not already initialized because EJBs initialization happens before and as a consequence -> null pointer exception.

We think there are two options: - We get the application context somehow from the spring boot. - We can give the context that we could create by MySpringActuatorMetricsCoreTestInterceptor to the spring boot context.

Is there any solution? another option?

We are using Glassfish 3.1

Thanks!

Answer 1

Ok I found a way as it seems: I just added a beanRefContext.xml to my classpath: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans_2_0.dtd"> <beans> <bean class="org.springframework.context.support.ClassPathXmlApplicationContext"> <constructor-arg value="classpath*:simpleContext.xml" /> </bean> </beans>

Which references a new applicationContext file named simpleContext.xml also in my classpath:

...
<!-- Enable annotation support within our beans -->
<context:annotation-config/>
<context:spring-configured/>
<context:component-scan base-package="your.package.path" />
<context:property-placeholder location="classpath*:*.properties" />

...

Now I was able to inject spring boot services into my EJB:

@Stateless(name = "RightsServiceEJB")
@Remote
@Interceptors(SpringBeanAutowiringInterceptor.class)
public class RightsServiceEJB implements IRightsServiceEJB {

   @Autowired
   ExampleService exampleService;

   @Override
   public String sayHello() {
      return exampleService.sayHello();
   }

}

This however is for now a small hello world Example, I am not sure if the Spring service still can reference resources initialized by Spring boot. This will need further testing on my side.