Is there a way to deserialize the java object via python

Question

I stored the java object in hbase (i.e) Let's say I have an object 'User' with 3 parameters like firstname, middlename and lastname. I used the following code for serialization in java

Object object = (object) user;    
byte[] byteData = SerializationUtils.serialize((Serializable) object);

and stored in hbase like 'storing complete object (in byte[] format of above) in the Value portion of the KeyValue pair'

It is stored in hbase like (Example)

column=container:container, timestamp=1480016194005, value=\xAC\xED\x00\x05sr\x00&com.test.container\x07\x89\x83\xFA\x7F\xD0F\xA5\x02\x00\x08I\x00\x07classIdJ\x00\x14dateTimeInLongFormatZ\x00\x04rootZ\x00\x09undefinedL\x00\x03keyt\x00\x12Ljava/lang/String;L\x00\x04modeq\x00~\x00\x01L\x00\x04nameq\x00~\x00\x01L\x00\x06userIdq\x00~\x00\x01xp\x00\x00\x00\x02\x00\x00\x01X\x967\xBA\xF0\x00\x00t\x00\x1Econtainer_393_5639181044834024t\x00\x06expandt\x00\x02ert\x00\x08testadmin

when I try to retrieve the data, I used the following deserialization in java and converted back to object of readable format

object = SerializationUtils.deserialize(bytes);

I would like to retrieve the data stored in java format via happybase using python and I achieved it and received the data as available in hbase.

Is there a way to deserialize the java object via python?

Short answer: if you're asking this question then no. Longer answer: the Java binary serialization format is well specified so you could write code in Python, or any language, to read the data. But you obviously cannot create the same behaviour in Python code an in Java code so whilst you can read the data from the serialized format, you cannot read the behaviour. — Boris the Spider
– Boris the Spider, Commented Nov 25, 2016 at 16:23

evandrix · Accepted Answer · 2024-05-03 06:06:19Z

10

There is a Python 3 library for that:

https://pypi.python.org/pypi/javaobj-py3

Usage seems pretty easy with:

from pathlib import Path

import javaobj

jobj = Path('…').read_bytes()
pobj = javaobj.loads(jobj)
print(pobj)

edited May 3, 2024 at 6:06

evandrix

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answered Nov 25, 2016 at 16:42

Dennis Ich

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3 Comments

Amogh Over a year ago

By using pyobj = javaobj.loads(data) I am converting b"" to object but sometimes I am getting error RuntimeError: Stream has been ended unexpectedly while unmarshaling.. Do you know any reason?

afshin Over a year ago

I'm getting error on read_file; This method is not defined. What am I missing?

Brandon Over a year ago

That method doesn't exist in Python, you will have to define it yourself

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