Program: 166998
Project: 166998
Buggy source:
public JsonNode toJson(){
  ObjectNode edgeLabelNode=new ObjectNode(Topology.OBJECT_MAPPER.getNodeFactory());
  edgeLabelNode.put("String_Node_Str",getSchema().getName());
  edgeLabelNode.put("String_Node_Str",getLabel());
  JsonNode propertyNode=super.toJson();
  edgeLabelNode.set("String_Node_Str",propertyNode);
  ArrayNode outVertexLabelArrayNode=new ArrayNode(Topology.OBJECT_MAPPER.getNodeFactory());
  for (  VertexLabel outVertexLabel : this.outVertexLabels) {
    ObjectNode outVertexLabelObjectNode=new ObjectNode(Topology.OBJECT_MAPPER.getNodeFactory());
    outVertexLabelObjectNode.put("String_Node_Str",outVertexLabel.getLabel());
    outVertexLabelArrayNode.add(outVertexLabelObjectNode);
  }
  edgeLabelNode.set("String_Node_Str",outVertexLabelArrayNode);
  ArrayNode inVertexLabelArrayNode=new ArrayNode(Topology.OBJECT_MAPPER.getNodeFactory());
  for (  VertexLabel inVertexLabel : this.inVertexLabels) {
    ObjectNode inVertexLabelObjectNode=new ObjectNode(Topology.OBJECT_MAPPER.getNodeFactory());
    inVertexLabelObjectNode.put("String_Node_Str",inVertexLabel.getLabel());
    inVertexLabelArrayNode.add(inVertexLabelObjectNode);
  }
  edgeLabelNode.set("String_Node_Str",inVertexLabelArrayNode);
  if (this.getSchema().getTopology().isWriteLockHeldByCurrentThread()) {
    outVertexLabelArrayNode=new ArrayNode(Topology.OBJECT_MAPPER.getNodeFactory());
    for (    VertexLabel outVertexLabel : this.uncommittedOutVertexLabels) {
      ObjectNode outVertexLabelObjectNode=new ObjectNode(Topology.OBJECT_MAPPER.getNodeFactory());
      outVertexLabelObjectNode.put("String_Node_Str",outVertexLabel.getLabel());
      outVertexLabelArrayNode.add(outVertexLabelObjectNode);
    }
    edgeLabelNode.set("String_Node_Str",outVertexLabelArrayNode);
    inVertexLabelArrayNode=new ArrayNode(Topology.OBJECT_MAPPER.getNodeFactory());
    for (    VertexLabel inVertexLabel : this.uncommittedInVertexLabels) {
      ObjectNode inVertexLabelObjectNode=new ObjectNode(Topology.OBJECT_MAPPER.getNodeFactory());
      inVertexLabelObjectNode.put("String_Node_Str",inVertexLabel.getLabel());
      inVertexLabelArrayNode.add(inVertexLabelObjectNode);
    }
    edgeLabelNode.set("String_Node_Str",inVertexLabelArrayNode);
  }
  return edgeLabelNode;
}

Fixed version (ground truth):
@Override protected JsonNode toJson(){
  ObjectNode edgeLabelNode=new ObjectNode(Topology.OBJECT_MAPPER.getNodeFactory());
  edgeLabelNode.put("String_Node_Str",getSchema().getName());
  edgeLabelNode.put("String_Node_Str",getLabel());
  edgeLabelNode.set("String_Node_Str",super.toJson());
  ArrayNode outVertexLabelArrayNode=new ArrayNode(Topology.OBJECT_MAPPER.getNodeFactory());
  for (  VertexLabel outVertexLabel : this.outVertexLabels) {
    ObjectNode outVertexLabelObjectNode=new ObjectNode(Topology.OBJECT_MAPPER.getNodeFactory());
    outVertexLabelObjectNode.put("String_Node_Str",outVertexLabel.getLabel());
    outVertexLabelArrayNode.add(outVertexLabelObjectNode);
  }
  edgeLabelNode.set("String_Node_Str",outVertexLabelArrayNode);
  ArrayNode inVertexLabelArrayNode=new ArrayNode(Topology.OBJECT_MAPPER.getNodeFactory());
  for (  VertexLabel inVertexLabel : this.inVertexLabels) {
    ObjectNode inVertexLabelObjectNode=new ObjectNode(Topology.OBJECT_MAPPER.getNodeFactory());
    inVertexLabelObjectNode.put("String_Node_Str",inVertexLabel.getLabel());
    inVertexLabelArrayNode.add(inVertexLabelObjectNode);
  }
  edgeLabelNode.set("String_Node_Str",inVertexLabelArrayNode);
  if (this.getSchema().getTopology().isWriteLockHeldByCurrentThread()) {
    outVertexLabelArrayNode=new ArrayNode(Topology.OBJECT_MAPPER.getNodeFactory());
    for (    VertexLabel outVertexLabel : this.uncommittedOutVertexLabels) {
      ObjectNode outVertexLabelObjectNode=new ObjectNode(Topology.OBJECT_MAPPER.getNodeFactory());
      outVertexLabelObjectNode.put("String_Node_Str",outVertexLabel.getLabel());
      outVertexLabelArrayNode.add(outVertexLabelObjectNode);
    }
    edgeLabelNode.set("String_Node_Str",outVertexLabelArrayNode);
    inVertexLabelArrayNode=new ArrayNode(Topology.OBJECT_MAPPER.getNodeFactory());
    for (    VertexLabel inVertexLabel : this.uncommittedInVertexLabels) {
      ObjectNode inVertexLabelObjectNode=new ObjectNode(Topology.OBJECT_MAPPER.getNodeFactory());
      inVertexLabelObjectNode.put("String_Node_Str",inVertexLabel.getLabel());
      inVertexLabelArrayNode.add(inVertexLabelObjectNode);
    }
    edgeLabelNode.set("String_Node_Str",inVertexLabelArrayNode);
  }
  return edgeLabelNode;
}