filesystems - Is there a flat files JDO implementation? -

I have a simple app that I want to use JDO. But I do not want to use any dB back, just before the regular file system Zado, I had this class, it serializes that it objects to the file while the file name is "primary key" I do the same with JDO I want to be able to Is it possible?

Reference implementation for JDO 1.0 used flat files. View Apache JDO, which should contain the original files