Jython is the default interoperability solution for Python and Java. However, Jython runs on the Java virtual machine (JVM). Therefore, it cannot access NumPy modules, which are mostly written in C. JPype is an open source project that tries to solve this problem. The interfacing occurs on the native level between Python and JVM. Let's install JPype.
Download JPype from http://sourceforge.net/projects/jpype/files/.
Unpack it and run the following command:
$ python setup.py install