Error in destroying object in Box2D/LibGDX

Question

I'm trying to delete an object when a collision happens. I have put the following code in the render method of the object so it would be outside of the physics calculations.

public void render(SpriteBatch spriteBatch) {
    // some other code...
    body.setActive(false);
    body.getWorld().destroyBody(body);

But I'm getting an run-time error which crashes the JVM and shows,

AL lib: alc_cleanup: 1 device not closed

Assertion failed!

Program: C:\Program Files\Java\jre6\bin\javaw.exe File: /var/lib/hudson/jobs/libgdx-git/workspace/gdx/jni/Box2D/Dynamics/b2World.cpp, Line 133

Expression: m_bodyCount > 0

Can anyone help me here?

Answer 1

I was having the same problem. I had some edges that were being created and destroyed on the fly. It started crashing on me, and that lead me to this post. petervaz seemed to have the right idea. When I was destroying a body, I was not checking to see if it "existed" or not. For me, it was a simple check of a boolean value I had already set up.

if (on)
{
    on = false;
    world.getPhysicsWorld().destroyBody(body);
}

There have not been any of those crashes since I put that check in.

Answer 2

You must destroy your body after collision happened, for that override your EndContact() method.