Htykuut

I am trying to Inject ServletContext in my dependant scope class but it always gives the failure.

java.lang.IllegalStateException: No CXF message usable for JAX-RS @Context injections in that thread so can't use interface javax.servlet.ServletContext

I am not able to undestand the reason that why can't I inject it here. I am using a producer method and when inside producer method,I try to access ServletContext obj then it gives above exception. I have also checked if the Injected servlet context is null but it is not null. But When I call any method using it for example sc.getContextPath() it gives the above exception. Below is the code snippet:

@Dependent

public class AuthContexthandler {



  @Context

  ServletContext sc;



  @Produces

  JWTAuthContextInfo getInfo() {

    try{

      System.out.println(sc.getContextPath()); //here I get the above mentioned error

      //rest of the code

    }catch(Exception e){

      e.printStackTrace();

    }

  }

}

you must use @inject instead of @Context.

you can use @Context to inject object instances related to the context of HTTP requests into to JAX-RS source class and as AuthContextHandler(as @Christoph Böhme said) is not a JAX-RS source class so you cannot use @Context

but as http://docs.jboss.org/weld/reference/latest/en-US/html_single/ says:

An object bound to a lifecycle context is called a bean. CDI includes
built-in support for several different kinds of bean, including the
following Java EE component types:

managed beans, and EJB session beans. Both managed beans and EJB
session beans may inject other beans. But some other objects, which
are not themselves beans in the sense used here, may also have beans
injected via CDI. In the Java EE platform, the following kinds of
component may have beans injected:

message-driven beans,

interceptors,

servlets,

servlet filters and

servlet event listeners,

JAX-WS service endpoints and handlers,

JAX-RS resources,

providers and javax.ws.rs.core.Application subclasses, and

JSP tag handlers and tag library event listeners.

it means you also can use @Inject annotation in your JAX-RS source class.

there are also some predefined Beans in CDI such as ServletContext that you can use @inject annotation to inject them.

https://docs.jboss.org/seam/3/servlet/latest/reference/en-US/html/injectablerefs.html
https://docs.oracle.com/javaee/7/tutorial/cdi-adv004.htm