Program: 83505
Project: 83505
Buggy source:
public void generateClassOutlineJs(final CompilationUnitTree cu,PrintWriter w) throws IOException {
  try {
    w.printf("String_Node_Str");
    final JsonWriter jw=new JsonWriter(w);
    jw.startObject();
    jw.property("String_Node_Str",TreeUtil.getPackageName(cu));
    jw.key("String_Node_Str").startArray();
    new TreePathScanner<Void,Void>(){
      private final SourcePositions sourcePositions=pss.getSourcePositions();
      public Void visitClass(      ClassTree ct,      Void _){
        boolean r=pre(ct);
        super.visitClass(ct,_);
        if (r)         post();
        return _;
      }
      public Void visitMethod(      MethodTree mt,      Void _){
        boolean r=pre(mt);
        super.visitMethod(mt,_);
        if (r)         post();
        return _;
      }
      public Void visitVariable(      VariableTree vt,      Void _){
        boolean r=pre(vt);
        super.visitVariable(vt,_);
        if (r)         post();
        return _;
      }
      boolean pre(      Tree t){
        Element e=pss.getTrees().getElement(getCurrentPath());
        if (e == null)         return false;
        long endPos=sourcePositions.getEndPosition(cu,t);
        if (endPos < 0)         return false;
        if (TreeUtil.OUTLINE_WORTHY.contains(e.getKind())) {
          jw.startObject();
          writeOutlineNodeProperties(jw,e,cu,t);
          jw.key("String_Node_Str").startArray();
          return true;
        }
        return false;
      }
      private Void post(){
        jw.endArray().endObject();
        return null;
      }
    }
.scan(cu,null);
    jw.endArray().endObject();
    w.println("String_Node_Str");
  }
  finally {
    w.close();
  }
}

Fixed version (ground truth):
public void generateClassOutlineJs(final CompilationUnitTree cu,PrintWriter w) throws IOException {
  try {
    w.printf("String_Node_Str");
    final JsonWriter jw=new JsonWriter(w);
    jw.startObject();
    jw.property("String_Node_Str",TreeUtil.getPackageName(cu));
    jw.key("String_Node_Str").startArray();
    new TreePathScanner<Void,Void>(){
      private final SourcePositions sourcePositions=pss.getSourcePositions();
      public Void visitClass(      ClassTree ct,      Void _){
        boolean r=pre(ct);
        super.visitClass(ct,_);
        if (r)         post();
        return _;
      }
      public Void visitMethod(      MethodTree mt,      Void _){
        boolean r=pre(mt);
        super.visitMethod(mt,_);
        if (r)         post();
        return _;
      }
      public Void visitVariable(      VariableTree vt,      Void _){
        boolean r=pre(vt);
        super.visitVariable(vt,_);
        if (r)         post();
        return _;
      }
      boolean pre(      Tree t){
        Element e=pss.getTrees().getElement(getCurrentPath());
        if (e == null)         return false;
        long endPos=sourcePositions.getEndPosition(cu,t);
        if (endPos < 0)         return false;
        if (TreeUtil.OUTLINE_WORTHY_ELEMENT.contains(e.getKind())) {
          jw.startObject();
          writeOutlineNodeProperties(jw,e,cu,t);
          jw.key("String_Node_Str").startArray();
          return true;
        }
        return false;
      }
      private Void post(){
        jw.endArray().endObject();
        return null;
      }
    }
.scan(cu,null);
    jw.endArray().endObject();
    w.println("String_Node_Str");
  }
  finally {
    w.close();
  }
}