Program: 112202
Project: 112202
Buggy source:
private void validateBundle(List<ValidationMessage> errors,Element bundle,NodeStack stack){
  List<Element> entries=new ArrayList<Element>();
  bundle.getNamedChildren("String_Node_Str",entries);
  String type=bundle.getNamedChildValue("String_Node_Str");
  if (entries.size() == 0) {
    rule(errors,IssueType.INVALID,stack.getLiteralPath(),!(type.equals("String_Node_Str") || type.equals("String_Node_Str")),"String_Node_Str");
  }
 else {
    Element firstEntry=entries.get(0);
    NodeStack firstStack=stack.push(firstEntry,0,null,null);
    String fullUrl=firstEntry.getNamedChildValue("String_Node_Str");
    if (type.equals("String_Node_Str")) {
      Element resource=firstEntry.getNamedChild("String_Node_Str");
      NodeStack localStack=firstStack.push(resource,-1,null,null);
      String id=resource.getNamedChildValue("String_Node_Str");
      if (rule(errors,IssueType.INVALID,firstEntry.line(),firstEntry.col(),stack.addToLiteralPath("String_Node_Str","String_Node_Str"),resource != null,"String_Node_Str")) {
        validateDocument(errors,entries,resource,localStack.push(resource,-1,null,null),fullUrl,id);
      }
      checkAllInterlinked(errors,entries,stack,bundle);
    }
    if (type.equals("String_Node_Str")) {
      Element resource=firstEntry.getNamedChild("String_Node_Str");
      NodeStack localStack=firstStack.push(resource,-1,null,null);
      String id=resource.getNamedChildValue("String_Node_Str");
      if (rule(errors,IssueType.INVALID,firstEntry.line(),firstEntry.col(),stack.addToLiteralPath("String_Node_Str","String_Node_Str"),resource != null,"String_Node_Str")) {
        validateMessage(errors,entries,resource,localStack.push(resource,-1,null,null),fullUrl,id);
      }
      checkAllInterlinked(errors,entries,stack,bundle);
    }
  }
}

Fixed version (ground truth):
private void validateBundle(List<ValidationMessage> errors,Element bundle,NodeStack stack){
  List<Element> entries=new ArrayList<Element>();
  bundle.getNamedChildren("String_Node_Str",entries);
  String type=bundle.getNamedChildValue("String_Node_Str");
  type=StringUtils.defaultString(type);
  if (entries.size() == 0) {
    rule(errors,IssueType.INVALID,stack.getLiteralPath(),!(type.equals("String_Node_Str") || type.equals("String_Node_Str")),"String_Node_Str");
  }
 else {
    Element firstEntry=entries.get(0);
    NodeStack firstStack=stack.push(firstEntry,0,null,null);
    String fullUrl=firstEntry.getNamedChildValue("String_Node_Str");
    if (type.equals("String_Node_Str")) {
      Element resource=firstEntry.getNamedChild("String_Node_Str");
      NodeStack localStack=firstStack.push(resource,-1,null,null);
      String id=resource.getNamedChildValue("String_Node_Str");
      if (rule(errors,IssueType.INVALID,firstEntry.line(),firstEntry.col(),stack.addToLiteralPath("String_Node_Str","String_Node_Str"),resource != null,"String_Node_Str")) {
        validateDocument(errors,entries,resource,localStack.push(resource,-1,null,null),fullUrl,id);
      }
      checkAllInterlinked(errors,entries,stack,bundle);
    }
    if (type.equals("String_Node_Str")) {
      Element resource=firstEntry.getNamedChild("String_Node_Str");
      NodeStack localStack=firstStack.push(resource,-1,null,null);
      String id=resource.getNamedChildValue("String_Node_Str");
      if (rule(errors,IssueType.INVALID,firstEntry.line(),firstEntry.col(),stack.addToLiteralPath("String_Node_Str","String_Node_Str"),resource != null,"String_Node_Str")) {
        validateMessage(errors,entries,resource,localStack.push(resource,-1,null,null),fullUrl,id);
      }
      checkAllInterlinked(errors,entries,stack,bundle);
    }
  }
}