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PONullPointerException I cannot resolve
 

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    <p>This is the method called when the player has to be removed from the game. Both these methods are in different classes.</p> <p><strong>GameboardGUI class</strong></p> <pre><code> Vector&lt;Player&gt; players = new Vector&lt;Player&gt;(); public void removePlayerFromGame(Player playerToRemove) { //go through the playerToRemove's properties and reset all their variables for(int i = 0; i &lt; playerToRemove.getPropertiesOwned().size(); i++) { //code to reset the player's properties to an unowned/unmodified state } //same with transports for(int i = 0; i &lt; playerToRemove.getTransportsOwned().size(); i++) { //code to reset the player's transports to an unowned/unmodified state } //just updating the vector based on the playerToRemove's position if(players.get(0) == playerToRemove) { players.remove(playerToRemove); updatePlayerInformation(); } else { players.remove(playerToRemove); updatePlayerVector(players); updatePlayerInformation(); } } </code></pre> <p>This is how the method is called: If the current player (fromMe) lands on a property and cant afford to pay the rent (i.e. their balance reaches 0 as a result of <code>takefrombalance(1200);</code>, currently hardcoded to 1200 to make testing easier) they are removed in the if statement <code>if(fromMe.isBankrupt())</code></p> <p><strong>Property Class</strong></p> <pre><code>GameboardGUI gui = new GameboardGUI(); public void payRent(Player fromMe, Player toYou, int rent) { //remove rent from the current player fromMe.takeFromBalance(1200); //add it to the owner toYou.addToBalance(rent); GameboardGUI.addGameFeedMessage(fromMe.getName() + " has paid " + rent + " in rent to " + toYou.getName()); GameboardGUI.addGameFeedMessage(toYou.getName() + "'s balance is now " + toYou.getBalance()); if(fromMe.isBankrupt()) { //THIS IS THE CALL THAT THROWS THE NullPointerException gui.removePlayerFromGame(fromMe); } else { GameboardGUI.addGameFeedMessage(fromMe.getName() + "'s balance is now " + fromMe.getBalance()); } } </code></pre> <p>Here is the stack trace when the line is reached:</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at PropertyTile.payRent(PropertyTile.java:254) at PropertyTile.landedOnProperty(PropertyTile.java:239) at GameboardGUI.playerHasLanded(GameboardGUI.java:1905) at Player.setPosition(Player.java:82) at Player.movePlayer(Player.java:101) at GameboardGUI$11.actionPerformed(GameboardGUI.java:1536) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$000(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) </code></pre>
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    1. COBasically the method call gui.removePlayerFromGame(fromMe); is to remove the player 'fromMe' from the game as they cannot afford to pay rent. It throws an null pointer exception for that line. I cannot find out why. That's the only code that is relevant to that method.
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    2. CODid you tried debugging?, Where is gui defined?
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    3. CO@IEatSandvich Stack Trace please? and where is `gui`? I dont see it anywhere in `Class` class
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