<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def generate_example(self):
 """ Returns a single Instance. :return: the next example :rtype: Instance """

        data = javabridge.call(self.jobject, "generateExample", "()Lweka/core/Instance;")
        if data is None:
            return None
        else:
            return Instance(data)