#vulnerable code 
                              public JsonObject config() {
    JsonObject config = getComponentContext().getDefinition().config();
    if (config == null) {
      config = new JsonObject();
    }
    return config;
  } 
                            #location 2 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              public JsonObject config() {
    if (parent == null) {
      return new JsonObject();
    }
    JsonObject config = parent.getDefinition().config();
    if (config == null) {
      config = new JsonObject();
    }
    return config;
  }