jprefctl is a Development software developed by can.bican. After our trial and test, the software is proved to be official, secure and free. Here is the official description for jprefctl:
Brothersoft Editor: This is a Simple Command line utility to dump and restore the java preferences database. Format of the dump is simple so that it can be edited with usual text processing tools.
Have a look at CmdLineOpts PaGE for a list of usage patterns. Input/output format is available at the formatting document. Download a binary from the download page. Checkout the sources from svn at here. you can free download jprefctl 0.9 now.