code: def java_class(cls):
      return "org.apache.flink.streaming.api.environment.StreamExecutionEnvironment"
  
imports: from pyflink.datastream import StreamExecutionEnvironment
  from pyflink.testing.test_case_utils import PythonAPICompletenessTestCase, PyFlinkTestCase
label_desc: Use image node_id 2 for calling the StreamExecutionEnvironmentCompletenessTests obj's underlying member method code with example usage: obj.java_class(cls) and returns: str