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POJButton setIcon nullPointerException
 

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  1. POJButton setIcon nullPointerException
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    <p>My Code:</p> <pre><code>private JButton stopBotting = new JButton(); ImageIcon img = new ImageIcon(getClass().getResource(System.getProperty("user.dir") + "VisualBot/resources/play.png")); stopBotting.setIcon(img); add(stopBotting); </code></pre> <p>Full Code:</p> <pre><code>package bot; import java.awt.Image; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowEvent; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; public class GuiBotting extends JFrame{ private int controlWidth = 300; private int controlHeight = 78; private JButton startBotting = new JButton(); private JButton stopBotting = new JButton(); private JButton pauseBotting = new JButton(); private GuiBotting(){ setVisible(true); setResizable(false); setSize(controlWidth, controlHeight); setDefaultCloseOperation(DO_NOTHING_ON_CLOSE); setLayout(null); ImageIcon img = new ImageIcon(getClass().getResource(System.getProperty("user.dir") + "VisualBot/resources/play.png")); stopBotting.setIcon(img); eventStartBotting startBottingEvent = new eventStartBotting(); eventStopBotting stopBottingEvent = new eventStopBotting(); eventPauseBotting pauseBottingEvent = new eventPauseBotting(); startBotting.addActionListener(startBottingEvent); stopBotting.addActionListener(stopBottingEvent); pauseBotting.addActionListener(pauseBottingEvent); startBotting.setBounds(0, 0, 100, 50); stopBotting.setBounds(0, 0, 50, 50); pauseBotting.setBounds(50, 0, 50, 50); add(stopBotting); add(pauseBotting); stopBotting.setVisible(false); pauseBotting.setVisible(false); addWindowListener(new java.awt.event.WindowAdapter() { public void windowClosing(WindowEvent winEvt) { setVisible(false); dispose(); VisualBot.stopBotting(); GuiPreparation.openGui(); } }); } public class eventStartBotting implements ActionListener{ public void actionPerformed(ActionEvent startBottingActionEvenr){ System.out.println("Starting with botting..."); VisualBot.startBotting(); pauseBotting.setVisible(true); stopBotting.setVisible(true); } } public class eventStopBotting implements ActionListener{ public void actionPerformed(ActionEvent stopBottingActionEvent) { System.out.println("Stopping with botting..."); VisualBot.stopBotting(); dispose(); GuiPreparation.openGui(); } } public class eventPauseBotting implements ActionListener{ public void actionPerformed(ActionEvent pauseBottingActionEvent){ System.out.println("Pausing botting..."); VisualBot.pauseBotting(); stopBotting.setBounds(0, 0, 100, 50); stopBotting.setVisible(false); pauseBotting.setVisible(false); } } public static void openGui(){ GuiBotting guiBotting = new GuiBotting(); } } </code></pre> <p>When I open the gui I get this error:</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.swing.ImageIcon.&lt;init&gt;(Unknown Source) at darkorbit.GuiBotting.&lt;init&gt;(GuiBotting.java:31) at darkorbit.GuiBotting.openGui(GuiBotting.java:98) at darkorbit.GuiPreparation$eventStartBotting.actionPerformed(GuiPreparation.java:255) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$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) etc... </code></pre> <p>I just don't understand, even when I set the full path of the image I get the nullPointerException. I found a lot of answers for this and tried all of them but I havent got it to work. I use Eclipse if that matters</p> <p>Also failed:</p> <pre><code>package bot; import java.awt.Image; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowEvent; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; public class GuiBotting extends JFrame{ private int controlWidth = 300; private int controlHeight = 78; private JButton startBotting = new JButton(); private JButton stopBotting = new JButton(); private JButton pauseBotting = new JButton(); private GuiBotting(){ setVisible(true); setResizable(false); setSize(controlWidth, controlHeight); setDefaultCloseOperation(DO_NOTHING_ON_CLOSE); setLayout(null); ImageIcon img = new ImageIcon(getClass().getResource(System.getProperty("user.dir") + "/VisualBot/resources/play.png")); stopBotting.setIcon(img); eventStartBotting startBottingEvent = new eventStartBotting(); eventStopBotting stopBottingEvent = new eventStopBotting(); eventPauseBotting pauseBottingEvent = new eventPauseBotting(); startBotting.addActionListener(startBottingEvent); stopBotting.addActionListener(stopBottingEvent); pauseBotting.addActionListener(pauseBottingEvent); startBotting.setBounds(0, 0, 100, 50); stopBotting.setBounds(0, 0, 50, 50); pauseBotting.setBounds(50, 0, 50, 50); add(stopBotting); add(pauseBotting); stopBotting.setVisible(false); pauseBotting.setVisible(false); addWindowListener(new java.awt.event.WindowAdapter() { public void windowClosing(WindowEvent winEvt) { setVisible(false); dispose(); VisualBot.stopBotting(); GuiPreparation.openGui(); } }); } public class eventStartBotting implements ActionListener{ public void actionPerformed(ActionEvent startBottingActionEvenr){ System.out.println("Starting with botting..."); VisualBot.startBotting(); pauseBotting.setVisible(true); stopBotting.setVisible(true); } } public class eventStopBotting implements ActionListener{ public void actionPerformed(ActionEvent stopBottingActionEvent) { System.out.println("Stopping with botting..."); VisualBot.stopBotting(); dispose(); GuiPreparation.openGui(); } } public class eventPauseBotting implements ActionListener{ public void actionPerformed(ActionEvent pauseBottingActionEvent){ System.out.println("Pausing botting..."); VisualBot.pauseBotting(); stopBotting.setBounds(0, 0, 100, 50); stopBotting.setVisible(false); pauseBotting.setVisible(false); } } public static void openGui(){ GuiBotting guiBotting = new GuiBotting(); } } </code></pre>
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