python 调用java 如何调用

Question

import jpype
import os
jarpath = os.path.join(os.path.abspath('.'), '/waimai_sign.jar')#第二个参数是jar包的路径

jpype.startJVM(jpype.getDefaultJVMPath(), "-ea", "-Djava.class.path=%s" %(jarpath))#启动jvm

JDClass = jpype.JClass("waimai_sign_algorithm")
ss = JDClass()#创建类的实例，可以调用类里边的方法
response=ss.get_para('/mtapi/v7/poi/channelpage','180')
print(response)

jpype.shutdownJVM()#最后关闭jvm

请问这里的jpype.JClass 调用的包名是什么？
报错如下

"D:\loading software\python3.8\python.exe" F:/shansong/test/test.py
Traceback (most recent call last):
  File "F:/shansong/test/test.py", line 7, in <module>
    JDClass = jpype.JClass("waimai_sign_algorithm")
  File "D:\loading software\python3.8\lib\site-packages\jpype\_jclass.py", line 99, in __new__
    return _jpype._getClass(jc)
TypeError: Class waimai_sign_algorithm is not found

Process finished with exit code 1