The 2 producer methods for ProcessInstance and Execution will always create an AmbiguousResolutionException for

@Inject
Execution execution;

The reason is that ProcessInstance extends Execution and thus you will have 2 producer methods which satisfy the 'Execution' type.

A solution for this would be to force the ProcessInstance Producer to only resolve his own type:

  @Produces
  @Named
  @Typed(ProcessInstance.class)
  public ProcessInstance getProcessInstance()