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POGetting Exception in "AWT-EventQueue-0" Thread Error
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  1. POGetting Exception in "AWT-EventQueue-0" Thread Error
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    copied!<p>i know this question has been asked like a million times but i have looked on a lot of the answers and they in no way help me. i have no idea what i am doing wrong.</p> <p>I believe the reason i am getting the error is due to this code here:</p> <pre><code> RollerBall roller = new RollerBall(game); roller.setPosition(new Vec2(-50,-120)); </code></pre> <p>I am using the above code to call a class which code is shown below:</p> <pre><code>package game; import city.soi.platform.*; import fsm.FSM; public class RollerBall extends Body implements StepListener { public static final float RANGE = 150; private Game game; private FSM&lt;RollerBall&gt; fsm; public RollerBall(Game game) { super(game.getWorld()); game = game; fsm = new FSM&lt;RollerBall&gt;(this); fsm.start(new StandStillState()); getWorld().addStepListener(this); } public boolean inRangeLeft() { Player p = game.getPlayer(); float gap = getPosition().x - p.getPosition().x; return gap &lt; RANGE &amp;&amp; gap &gt; 0; } public boolean inRangeRight() { Player p = game.getPlayer(); float gap = getPosition().x - p.getPosition().x; return gap &gt; -RANGE &amp;&amp; gap &lt; 0; } public boolean inRange() { return inRangeLeft() || inRangeRight(); } public void preStep(StepEvent e) { fsm.update(); } public void postStep(StepEvent e) {} } </code></pre> <p>Finally, when trying to do this i am getting the following error:</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at game.RollerBall.inRangeLeft(RollerBall.java:23) at game.StandStillState.update(StandStillState.java:10) at fsm.FSM.update(FSM.java:47) at game.RollerBall.preStep(RollerBall.java:39) at city.soi.platform.World.preStep(World.java:495) at city.soi.platform.World.step(World.java:328) at city.soi.platform.World$1.actionPerformed(World.java:206) at javax.swing.Timer.fireActionPerformed(Timer.java:312) at javax.swing.Timer$DoPostEvent.run(Timer.java:244) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721) at java.awt.EventQueue.access$200(EventQueue.java:103) at java.awt.EventQueue$3.run(EventQueue.java:682) at java.awt.EventQueue$3.run(EventQueue.java:680) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:691) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139) at java.awt.EventDispatchThread.run(EventDispatchThread.java:97) </code></pre> <p>Thanks in advance for your help.</p>
 

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