ArrayIndexOutOfBounds from jBox2d when trying to create bodies with joints

[scurv...@gmail.com]

Ok, I'm kind of at a lose for what is happening and I'm hoping someone can help point me in the direction of my problem.

I'm getting the following error when I'm trying to create a chain to attach two bodies.  It only happens randomly, so I can create and destroy the chain a number of times just fine but I eventually get the error.  It doesn't seem like it's due to not cleaning up either because at times it will happen right away and other time it will take a while.

Exception in thread "AWT-EventQueue-0"
java.lang.ArrayIndexOutOfBoundsException: 74
       at org.jbox2d.dynamics.Island.add(Island.java:423)
       at org.jbox2d.dynamics.World.solve(World.java:976)
       at org.jbox2d.dynamics.World.step(World.java:560) 

That line in the Island.add() method is where it is trying to add a joint to the Island's array of joints.

I create the chain based on a touch event.

Initially I tried to create it "slowly" and I was using the update() method on an entity to add more links (this seemed wrong but I couldn't think of another way to handle this easily).  I ran into this error so I changed it to create the entire chain on the initial touch event and still randomly got the error.

Any help would be appreciated.

[Philip Rogers]

You may want to try the Box2D forum here:

http://www.box2d.org/forum/viewforum.php?f=9&sid=13daec581f8005da7a36ebc333fa9872

I found some nice undocumented gotchas dealing with convexity and NPEing if I got it wrong. JBox2d can be finicky :)

Philip