code: def get_java_container(self, package_name=None, object_name=None, java_class_instance=None):
          
          if package_name is not None:
              jcontainer = self.import_scala_package_object(package_name)
          elif object_name is not None:
              jcontainer = self.import_scala_object(object_name)
          elif java_class_instance is not None:
              jcontainer = java_class_instance
          else:
              raise RuntimeError("Expected one of package_name, object_name or java_class_instance")
          return jcontainer
docs: Convenience method to get the container that houses methods we wish to call a method on.