multithreading - JPA and Threads in play framework -

i'm trying create multithreading server. problem following error: play.exceptions.jpaexception: jpa context not initialized. jpa entity manager automatically start when 1 or more classes annotated @javax.persistence.entity annotation found in application.

what i'm trying access db new thread here's code

package controllers; import java.util.iterator; import java.util.list; import models.ball;   public class mainloop extends thread {  @override public void run() {     list<ball> balls;     new ball(5,5,2,2,10,15);     while (true){         balls = ball.all().fetch(); //here throws exception           (iterator iterator = balls.iterator(); iterator.hasnext();) {             ball ball = (ball) iterator.next();             ball.applyforces();         }     } } } 

any ideas?

don't use plain thread, use jobs instead :

@onapplicationstart  public class mainloop extends job {         public void dojob() {                 new balljob().now();         } }  

and balljob :

public class balljob extends job { public void dojob() {     list<ball> balls;     new ball(5,5,2,2,10,15);     while (true){         balls = ball.all().fetch();          (iterator iterator = balls.iterator(); iterator.hasnext();) {             ball ball = (ball) iterator.next();             ball.applyforces();         }     } }