Program: 52876
Project: 52876
Buggy source:
/** 
 * Canonicalizes any   {@link javax.lang.model.element.Element}s,   {@link TypeMirror}s, or   {@link AnnotationValue}s found in the given object, which is expected to have been obtained by calling  {@link AnnotationValue#getValue()}.
 */
Object getCanonicalValue(AnnotationValue annotationValue,TreePath valueTreePath){
  return annotationValue.accept(new SimpleAnnotationValueVisitor8<Object,Void>(){
    @Override public Object visitType(    TypeMirror t,    Void aVoid){
      return getCanonicalType(t,valueTreePath);
    }
    @Override public Object visitEnumConstant(    VariableElement c,    Void aVoid){
      return Preconditions.checkNotNull(elements.getCanonicalElement(c));
    }
    @Override public Object visitAnnotation(    AnnotationMirror a,    Void aVoid){
      return new TreeBackedAnnotationMirror(a,valueTreePath,PostEnterCanonicalizer.this);
    }
    @Override public Object visitArray(    List<? extends AnnotationValue> values,    Void aVoid){
      Tree valueTree=valueTreePath.getLeaf();
      if (valueTree instanceof NewArrayTree) {
        NewArrayTree tree=(NewArrayTree)valueTree;
        List<? extends ExpressionTree> valueTrees=tree.getInitializers();
        List<TreeBackedAnnotationValue> result=new ArrayList<>();
        for (int i=0; i < values.size(); i++) {
          result.add(new TreeBackedAnnotationValue(values.get(i),new TreePath(valueTreePath,valueTrees.get(i)),PostEnterCanonicalizer.this));
        }
        return result;
      }
 else {
        return Collections.singletonList(new TreeBackedAnnotationValue(values.get(0),new TreePath(valueTreePath,valueTree),PostEnterCanonicalizer.this));
      }
    }
    @Override public Object visitString(    String s,    Void aVoid){
      if (getUnderlyingType(valueTreePath).getKind() == TypeKind.ERROR) {
        Tree leaf=valueTreePath.getLeaf();
        if (leaf instanceof MemberSelectTree && ((MemberSelectTree)leaf).getIdentifier().contentEquals("String_Node_Str")) {
          TreePath classNamePath=new TreePath(valueTreePath,((MemberSelectTree)leaf).getExpression());
          return getCanonicalType(getUnderlyingType(classNamePath),classNamePath);
        }
      }
      return super.visitString(s,aVoid);
    }
    @Override protected Object defaultAction(    Object o,    Void aVoid){
      return o;
    }
  }
,null);
}

Fixed version (ground truth):
/** 
 * Canonicalizes any   {@link javax.lang.model.element.Element}s,   {@link TypeMirror}s, or   {@link AnnotationValue}s found in the given object, which is expected to have been obtained by calling  {@link AnnotationValue#getValue()}.
 */
Object getCanonicalValue(AnnotationValue annotationValue,TreePath valueTreePath){
  return annotationValue.accept(new SimpleAnnotationValueVisitor8<Object,Void>(){
    @Override public Object visitType(    TypeMirror t,    Void aVoid){
      return getCanonicalType(t,valueTreePath);
    }
    @Override public Object visitEnumConstant(    VariableElement c,    Void aVoid){
      return Preconditions.checkNotNull(elements.getCanonicalElement(c));
    }
    @Override public Object visitAnnotation(    AnnotationMirror a,    Void aVoid){
      return new TreeBackedAnnotationMirror(a,valueTreePath,PostEnterCanonicalizer.this);
    }
    @Override public Object visitArray(    List<? extends AnnotationValue> values,    Void aVoid){
      Tree valueTree=valueTreePath.getLeaf();
      if (valueTree instanceof NewArrayTree) {
        NewArrayTree tree=(NewArrayTree)valueTree;
        List<? extends ExpressionTree> valueTrees=tree.getInitializers();
        List<TreeBackedAnnotationValue> result=new ArrayList<>();
        for (int i=0; i < values.size(); i++) {
          result.add(new TreeBackedAnnotationValue(values.get(i),new TreePath(valueTreePath,valueTrees.get(i)),PostEnterCanonicalizer.this));
        }
        return result;
      }
 else {
        return Collections.singletonList(new TreeBackedAnnotationValue(values.get(0),new TreePath(valueTreePath,valueTree),PostEnterCanonicalizer.this));
      }
    }
    @Override public Object visitString(    String s,    Void aVoid){
      if (getUnderlyingType(valueTreePath).getKind() == TypeKind.ERROR) {
        Tree leaf=valueTreePath.getLeaf();
        if (leaf instanceof MemberSelectTree && ((MemberSelectTree)leaf).getIdentifier().contentEquals("String_Node_Str")) {
          TreePath classNamePath=new TreePath(valueTreePath,((MemberSelectTree)leaf).getExpression());
          return getCanonicalType(getUnderlyingType(classNamePath),classNamePath);
        }
 else {
          javacTrees.printMessage(Diagnostic.Kind.ERROR,"String_Node_Str",leaf,valueTreePath.getCompilationUnit());
        }
      }
      return super.visitString(s,aVoid);
    }
    @Override protected Object defaultAction(    Object o,    Void aVoid){
      return o;
    }
  }
,null);
}