Problems with j2me gaming

Hi guys. I need you to help me with this problem. I'm developing a j2me game using netbeans and the gamebuilder component. So everything it's ok, but the problems come when I charge the application into my cellphone. The first problem is on the collidesWith() method. In spite of the hero sprite and the enemy sprite are saperated from many pixels, the CollidesWith method fires by itself. As an example, the hero sprite is at the top of the screen and the enemy sprite is at the bottom of the screen, when the level begins, the collidesWith() method fires so the application show the game over screen as if the enemy touched the hero, which is not true.
The second problem is that when I try to stop the threads. For example if the hero sprite dies, all of the threads which drives the enemies should stop, so the player needs to restart the level for try again the level. The problem is that when the levels restarts, some of the enemies doesn't move.
Any of you know what the problem could be it?? I'll appreciate your quick answers. Thanks in advance.

HI Friend:
You install jdk1.5.try it!

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