PBS Torque Resources Manager is one of the best open-source load balancing clusters. This project will create an API to interface Java with PBS Torque through an Object Oriented Model not through the command-line. This is anticipate to simplify the task of integeratation of your Java Solutions.

You can download the tool from here.

The GetStarted manual is here.

API doc can be found at: http://www.nubios.nileu.edu.eg/pbs4java/