Java deserialization in C++

I'm working on a C++ application that has to process a variety of message types. One of the types is serialized Java objects (for which no source is available).
I'm wondering if anyone is aware of a C++ library along the lines of jdeserialize?
For those who aren't familiar with it, jdeserialize basically parses serialized objects and builds a graph.
It does a good job and I've been experimenting with it - using JNI to manage the interactions with the main program.
This works correctly, but is cumbersome. I'm concerned that it will be a maintenance headache.