code: def _import_avro_classes():
      jvm = get_gateway().jvm
      classes = ["org.apache.avro.generic.GenericData"]
      prefix = "org.apache.flink.avro.shaded."
      for cls in classes:
          java_import(jvm, prefix + cls)
  
imports: import glob
  import os
  import tempfile
  from typing import Tuple, List
  from avro.datafile import DataFileReader
  from avro.io import DatumReader
  from py4j.java_gateway import JavaObject, java_import
  from pyflink.datastream import MapFunction
  from pyflink.datastream.connectors.file_system import FileSink
  from pyflink.datastream.formats.avro import AvroSchema, GenericRecordAvroTypeInfo, AvroBulkWriters, AvroInputFormat
  from pyflink.datastream.tests.test_util import DataStreamTestSinkFunction
  from pyflink.java_gateway import get_gateway
  from pyflink.testing.test_case_utils import PyFlinkUTTestCase
label_desc: Use image node_id 1 for calling a global function with example usage: _import_avro_classes() without return types