class_docstr: An object that keeps a org.apache.arrow.memory.ArrowBuf's underlying
  memory alive.
code: def __del__(self):
      if self.ref_manager is not None:
          self.ref_manager.release()
  
file_path: arrow/python/pyarrow/jvm.py
imports: import pyarrow
label_desc: Use image node_id 2 for calling the _JvmBufferNanny obj's underlying member method code with example usage: obj.__del__() without return types