Jpxfw is stored at sourceforge, in an svn repository. To get a copy, you have several options, each explained below. If you are a windows user, you may want to get the Tortoise SVN for windows client software.
After you got a copy of jxpfw you should be able to build jxpfw.
Assuming you have svn client installed, you can anonymously checkout a copy using the command:
svn checkout http://svn.code.sf.net/p/jxpfw/svncode/trunk/jxpfw jxpfw.
This command checks out jxpfw's trunk and creates a new jxpfw directory in your current directory,
before checking out the source files.
Note: This option won't allow you to commit changes.
To check put jxpfw as a developer, allowing you to commit changes, use this url: https://svn.code.sf.net/p/jxpfw/svncode/trunk. To get the jxpfw module only, simply use: https://svn.code.sf.net/p/jxpfw/svncode/trunk/jxpfw.