output: #fixed code
                                public Tree getParent( Tree node )
    {
      return _parents.getParent( node );
    }
input: #vulnerable code 
                                public Tree getParent( Tree node )
    {
      TreePath2 path = TreePath2.getPath( getCompilationUnit(), node );
      if( path == null )
      {
        // null is indiciative of Generation phase where trees are no longer attached to symobls so the comp unit is detached
        // use the root tree instead, which is mostly ok, mostly
        path = TreePath2.getPath( _tree, node );
      }
      TreePath2 parentPath = path.getParentPath();
      return parentPath == null ? null : parentPath.getLeaf();
    } 
                              #location 10 
                              #vulnerability type NULL_DEREFERENCE