PH25479: JAXRS resource not injecting objects via CDI constructor injection

APAR status

• Closed as program error.

Error description

• If a customer attempts to perform CDI injection using the
  @Inject annotation on the constructor of a JAX-RS resource
  class, injection will not occur unless the class is
  annotated with a CDI scope annotation. Previously, user's
  did not have to annotate their classes.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  ALL                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: JAX-RS applications which use CDI       *
  *                      constructor injection to inject fields  *
  *                      into their JAX-RS resource class do not *
  *                      perform injection resulting in a        *
  *                      NullPointerException when the field is  *
  *                      used.                                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Customer's application code throws a NullPointerException and
  the JAX-RS request returns an HTTP 500 when attempting to use an
  object in their JAX-RS resource class which is injected via CDI
  constructor injection.
  
  @Path("cdiresource")
  public class CDIResource { // This is a JAX-RS resource class
  
      private ClassA classA; // This object never gets injected
  
      public CDIResource() {}
  
      @Inject
      public CDIResource(ClassA classA) {
          this.classA = classA;
      }
  
      @GET
      @Path("get")
      @Produces(MediaType.APPLICATION_JSON)
      public Response get() {
          return Response.ok().entity(classA.message()).build();
  /// NullPointerException trying to call classA.message()
      }
  }
  

Problem conclusion

• To perform CDI constructor injection on JAX-RS resource classes,
  reverted to getting the object from CDI the old way when the
  class is not a Weld proxy.
  
  The fix for this APAR is currently targeted for inclusion in fix
  pack 20.0.0.6.  Please refer to the Recommended Updates page for
  delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

• Annotate the JAX-RS resource class with the @Dependent CDI
  annotation.
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WAS LIBERTY COR

• Fixed component ID

  5725L2900

Applicable component levels