public static _Fields findByThriftId(int fieldId) {
        switch(fieldId) {
          case 1: // MESSAGE
            return MESSAGE;
          default:
            return null;
        }
      }
Find the _Fields constant that matches fieldId, or null if its not found.
agent-module/agent-testweb/thrift-plugin-testweb/src/main/java/com/pinpoint/test/plugin/dto/EchoService.java