code: def test_jvm_buffer(root_allocator):
      # Create a Java buffer
      jvm_buffer = root_allocator.buffer(8)
      for i in range(8):
          jvm_buffer.setByte(i, 8 - i)
  
      orig_refcnt = jvm_buffer.refCnt()
  
      # Convert to Python
      buf = pa_jvm.jvm_buffer(jvm_buffer)
  
      # Check its content
      assert buf.to_pybytes() == b"\x08\x07\x06\x05\x04\x03\x02\x01"
  
      # Check Java buffer lifetime is tied to PyArrow buffer lifetime
      assert jvm_buffer.refCnt() == orig_refcnt + 1
      del buf
      assert jvm_buffer.refCnt() == orig_refcnt
  
file_path: arrow/python/pyarrow/tests/test_jvm.py
imports: import json
  import os
  import pyarrow
  import pyarrow.jvm
  import pytest
  import sys
  import xml.etree.ElementTree
label_desc: Use image node_id 2 for calling a global function with example usage: test_jvm_buffer(root_allocator) without return types