Jython CLASSPATH, sys.path and JDBC drivers

Question

How can I add JDBC drivers at runtime to Jython? Using CLASSPATH works, but using sys.path doesn\'t work with zxJDBC even though the class is imported fine and can be manipu

Answer 1

The solution is tricky, but everything is explained here.

Answer 2

Looks like even the updated link does not work anymore (at least with jython-2.5.3b3).

Here's a working version:

def importJar(jarFile):
    '''
    import a jar at runtime (needed for JDBC [Class.forName])

    adapted from http://forum.java.sun.com/thread.jspa?threadID=300557
    Author: SG Langer Jan 2007 translated the above Java to Jython
    Author: seansummers@gmail.com simplified and updated for jython-2.5.3b3

    >>> importJar('jars/jtds-1.2.5.jar')
    >>> import java.lang.Class
    >>> java.lang.Class.forName('net.sourceforge.jtds.jdbc.Driver')
    <type 'net.sourceforge.jtds.jdbc.Driver'>
    '''
    from java.net import URL, URLClassLoader
    from java.lang import ClassLoader
    from java.io import File
    m = URLClassLoader.getDeclaredMethod("addURL", [URL])
    m.accessible = 1
    m.invoke(ClassLoader.getSystemClassLoader(), [File(jarFile).toURL()])

if __name__ == '__main__':
    import doctest
    doctest.testmod()

---

I keep this Gist updated with my production version.