Description Bastian U 2015-07-15 06:51:02 EDT

Created attachment 255207 [details]
Demo project (containing the visitor and logic to create the example project)

(Might be related to #472617 ???)

Example code: 

public class R2 {
  void l() {
    C c1 = new C();
    c1.a(a -> {
      new Object() { };                   // [1]
    });
    C c2 = new C();
    c2.a(new Consumer<Object>() {         // [2]
      @Override
      public void accept(Object t) {
      }
    });
  }
}

class C {
  void a(Consumer<?> d) {
  }
}


Applying following visitor to this example program allows to construct the type hierarchy of the anonymous class of "new Consumer<Object>() { ... }":

class AnonymousClassVisitor extends ASTVisitor {
  public boolean visit(AnonymousClassDeclaration typeDeclaration) {
      IType type = (IType) typeDeclaration.resolveBinding().getJavaElement();
      ITypeHierarchy newSupertypeHierarchy = type.newSupertypeHierarchy(new NullProgressMonitor());
      IType superclass = newSupertypeHierarchy.getSuperclass(type);
      /* [3] */
 }
}

At [3], superclass is null, when handling the anonymous class declaration denoted with [2].

The strange thing is that it is only null, if the anonymous class declaration denoted with [1] is handled before. If you remove line [1] or only remove the curly braces (so that 'new C(){};' becomes 'new C();'), superclass at [3] is  well 'java.lang.Object' when handling [2]. 


The attachment contains demo code for this problem, providing logic to create the demo project in the runtime eclipse and applying the mentioned visitor.