libgdx+box2d joints not working properly under gravity -

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i trying create pendulum using box2d/libgdx connecting static , dynamic body. have tried various types of joints distance joint, rope joint , revolute joint under gravity dynamic body ends escaping down after being constrained joint. in 0 gravity joints work properly. know must doing silly.

       world.getbodies(p);        distancejointdef djd=new distancejointdef();        djd.bodya=p.get(0);         djd.bodyb=p.get(1);         djd.localanchora.set(0,0);         djd.localanchorb.set(0,0);         djd.collideconnected=true;                distancejoint pend=(distancejoint)world.createjoint(djd);            pend.setlength(50);

ps. have yet implemented contact listener .i have not figured out how this. putting collision listener help?

if question correctly, moving body falls irrespective of type of joint applied. 1 reason why happen because may have defined both anchor , pendulum dynamic bodies, , both fall same way due gravity.

i assuming not yet rendering anchor body, not see falling.


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