title: Integrate stiff ODEs with Java
body: <p>Are there any free, open-source stiff integrator libraries for Java?</p>
  
  <p>I am currently using the Dormand-Prince 8(5,3) integrator from the Apache Commons Math Library. I am implementing a DAE approximation for my model so I can use this integrator, but I would be interested in trying a stiff solver on the straight ODE system for comparison.</p>
  
  <p>I have searched around but can't seem to find any straight answers. Something similar to the ode15s solver in MATLAB for Java?</p>