Is a new object created always for a RestEasy webservice class?

Question

We are using ReastEasy with JBoss EAP 6.x. I want to know if a new object is always created for every http request. If yes, how can I stop JBoss creating new objects for every request?

I annotated a void method in my web service class with javax.annotation.@PostConstruct to check if a new object is always being created. For my amusement the method itself was not called. Then I understood that the servlet container is managing my web service classes and that is why the @PostConstruct is not called. Am I right?

Can anyone please point me to some resources which explains the webservice life cycle?

Answer 1

"I want to know if a new object is always created for every http request"

Yes. See section 3.1.1 Lifecycle and Environment, in the JAX-RS spec:

By default a new resource class instance is created for each request to that resource.

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"If yes, how can I stop jboss creating new objects for every request?"

One way is to override getSingletons() in Application subclass, which returns a Set of resources and providers you want to be only created once. See Resteasy Doc for more information on deployment options. For example

@ApplicationPath("/rest")
public class RestApplication extends Application {
    private final Set<Object> singletons = new HashSet<Object>();

    public RestApplication(){
        singletons.add(new SingletnResourceClass());
    }

    @Override
    public Set<Object> getSingletons(){
        return singletons;
    }
}

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"Then I understood that the servlet container is managing my web service classes and that is why the @PostConstruct is not called. Am I right?"

That annotation in Java EE is handled by CDI, and in JBoss, we should have a beans.xml file in the WEB-INF to enable the CDI module.

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"Can anyone please point me to some resources which explains the webservice life cycle?"

The first link above has some explanation