Google app engine 使用Java从应用程序引擎执行模板

我必须在固定的时间间隔内从App Engine触发dataflow作业的模板，以确定固定的时间间隔。我使用了cron作业，但不知道如何触发Java语言的模板。我需要以下Java形式的代码

import datetime
import logging
import os

from google.appengine.ext import ndb
import webapp2

    from googleapiclient.discovery import build
    from oauth2client.client import GoogleCredentials



    class LaunchJob(webapp2.RequestHandler):

        credentials = GoogleCredentials.get_application_default()
        service = build('dataflow', 'v1b3', credentials=credentials)

        # Set the following variables to your values.
        JOBNAME = 'kiss-fn-dataflow-job'
        PROJECT = 'testing1-18001111'
        BUCKET = 'kiss-bucket'
        TEMPLATE = 'Test1'

        GCSPATH="gs://{bucket}/templates/{template}".format(bucket=BUCKET, template=TEMPLATE),
        BODY = {
            "jobName": "{jobname}".format(jobname=JOBNAME),
            "parameters": {
                "inputFile" : "gs://{bucket}/input/my_input.txt",
                "outputFile": "gs://{bucket}/output/my_output".format(bucket=BUCKET)
             },
             "environment": {
                "tempLocation": "gs://{bucket}/temp".format(bucket=BUCKET),
                "zone": "us-central1-f"
             }
        }

        request = service.projects().templates().launch(projectId=PROJECT, gcsPath=GCSPATH, body=BODY)
        response = request.execute()


    app = webapp2.WSGIApplication([
        ('/', LaunchJob),
    ], debug=True)

上面的程序运行得很好，但要部署单个应用程序，Python中的许多依赖项都已完成，并且一些功能不可用，因此我需要更改Java中的App Engine程序。所以我可以在我的应用程序中使用Apache beam