code: def _to_java_object_rdd(self):
          
          rdd = self._pickled()
          return self.ctx._jvm.SerDeUtil.pythonToJava(rdd._jrdd, True)
docs: Return a JavaRDD of Object by unpickling
  
          It will convert each Python object into Java object by Pyrolite, whenever the
          RDD is serialized in batch or not.