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PODoes anyone know why this exception was thrown? Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
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  1. PODoes anyone know why this exception was thrown? Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
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    copied!<blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/11141425/can-anyone-help-me-identify-the-exception-in-thread-awt-eventqueue-0-java-lang">Can anyone help me identify the Exception in thread &ldquo;AWT-EventQueue-0&rdquo; java.lang.NullPointerException on Line 65?</a> </p> </blockquote> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at SelectUnitFrame.&lt;init&gt;(SelectUnitFrame.java:112) at CoolingTowerFrame$ButtonListener.actionPerformed(CoolingTowerFrame.java:184) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$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> <p>Code is long but i can edit this post and add if it would help</p> <p>i think the code is not working because of this [line 112] <code>tableButton.setRolloverEnabled(false);</code> the reason i need the rollover disabled is so that when the button changes when a button is pushed it does not return to the original image. If there are any fixes for that, that may work too. </p> <p>heres the code:</p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; import java.util.*; public class SelectUnitFrame extends JFrame { public JLabel showNumbersLabel; public JPanel showPanel = new JPanel(); public JButton tableButton; public JPanel buttonPanel = new JPanel(); public JButton goBackButton = new JButton("Change Variables"); public JButton exitButton = new JButton("Done"); public JButton nextButton = new JButton("&gt;"); public JButton prevButton = new JButton("&lt;"); public int fRate; public int wbTemp; public int r; public int a; public int rcTons; public int count; public String [] tablesFor80 = {"80F_FG2003.GIF", "80F_FG2004.GIF", "80F_FG2005.GIF", "80F_FG2007.GIF", "80F_FG2009.GIF", "80F_FG2011.GIF", "80F_FG2015.GIF"}; public String [] tablesFor78 = {"78F_FG2003.GIF", "78F_FG2004.GIF", "78F_FG2005.GIF", "78F_FG2007.GIF", "78F_FG2009.GIF", "78F_FG2011.GIF", "78F_FG2015.GIF"}; public String [] tablesFor76 = {"76F_FG2003.GIF", "76F_FG2004.GIF", "76F_FG2005.GIF", "76F_FG2007.GIF", "76F_FG2009.GIF", "76F_FG2011.GIF", "76F_FG2015.GIF"}; public String [] tablesFor74 = {"74F_FG2003.GIF", "74F_FG2004.GIF", "74F_FG2005.GIF", "74F_FG2007.GIF", "74F_FG2009.GIF", "74F_FG2011.GIF", "74F_FG2015.GIF"}; public String [] tablesFor72 = {"72F_FG2003.GIF", "72F_FG2004.GIF", "72F_FG2005.GIF", "72F_FG2007.GIF", "72F_FG2009.GIF", "72F_FG2011.GIF", "72F_FG2015.GIF"}; public String [] tablesFor70 = {"70F_FG2003.GIF", "70F_FG2004.GIF", "70F_FG2005.GIF", "70F_FG2007.GIF", "70F_FG2009.GIF", "70F_FG2011.GIF", "70F_FG2015.GIF"}; public String [] tablesFor68 = {"68F_FG2003.GIF", "68F_FG2004.GIF", "68F_FG2005.GIF", "68F_FG2007.GIF", "68F_FG2009.GIF", "68F_FG2011.GIF", "68F_FG2015.GIF"}; public ImageIcon tablePicture; public SelectUnitFrame(int flowRate, int wetBulbTemp, int roundedCoolingTons, int approach, int range) { super("Unit Selected"); Toolkit toolkit = Toolkit.getDefaultToolkit(); Dimension dimensions = toolkit.getScreenSize(); int x = (dimensions.width - 750)/2; int y = (dimensions.height - 350)/2; setBounds(x, y, 750, 350); setVisible(true); setResizable(false); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); goBackButton.addActionListener(new ButtonListener()); exitButton.addActionListener(new ButtonListener()); nextButton.addActionListener(new ButtonListener()); prevButton.addActionListener(new ButtonListener()); fRate = flowRate; wbTemp = wetBulbTemp; r = range; a = approach; rcTons = roundedCoolingTons; buttonPanel.add(goBackButton); buttonPanel.add(exitButton); add(buttonPanel, BorderLayout.SOUTH); showNumbersLabel = new JLabel("Wet Bulb: " + wbTemp + "(deg)F " + "Range: " + r + " Approach: " + a + " Tons/GPM: " + rcTons + "/" + fRate); showPanel.add(showNumbersLabel); add(showPanel, BorderLayout.NORTH); if ((wbTemp &gt;= 79) &amp;&amp; (wbTemp &lt; 82)) { tempSelection80(flowRate, wetBulbTemp, roundedCoolingTons, approach, range); } else if ((wbTemp &lt; 79 ) &amp;&amp; (wbTemp &gt;= 77)) { tempSelection78(flowRate, wetBulbTemp, roundedCoolingTons, approach, range); } else if ((wbTemp &lt; 77) &amp;&amp; (wbTemp &gt;= 75)) { tempSelection76(flowRate, wetBulbTemp, roundedCoolingTons, approach, range); } else if ((wbTemp &lt; 75) &amp;&amp; (wbTemp &gt;= 73)) { tempSelection74(flowRate, wetBulbTemp, roundedCoolingTons, approach, range); } else if ((wbTemp &lt; 73) &amp;&amp; (wbTemp &gt;= 71)) { tempSelection72(flowRate, wetBulbTemp, roundedCoolingTons, approach, range); } else if ((wbTemp &lt; 71) &amp;&amp; (wbTemp &gt;= 69)) { tempSelection70(flowRate, wetBulbTemp, roundedCoolingTons, approach, range); } else if ((wbTemp &lt; 69) &amp;&amp; (wbTemp &gt;= 67)) { tempSelection68(flowRate, wetBulbTemp, roundedCoolingTons, approach, range); } else { tableButton = new JButton("Cooling Tower Cannot Handle Temperatures In This Wet Bulb"); } tableButton.setRolloverEnabled(false); add(nextButton, BorderLayout.EAST); add(prevButton, BorderLayout.WEST); add(tableButton, BorderLayout.CENTER); } private class ButtonListener implements ActionListener { @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == goBackButton) { dispose(); } else if (e.getSource() == exitButton) { System.exit(0); } else if (e.getSource() == nextButton) { String t = tableButton.getText(); tableButton.updateUI(); String s = ((ImageIcon)tableButton.getIcon()).toString(); if ((wbTemp &gt;= 79) &amp;&amp; (wbTemp &lt; 82)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor80[i])) { if (i == 6) { count = 0; } else { count = (i+1); } } } } tableButton = new JButton(new ImageIcon(tablesFor80[count], tablesFor80[count])); } else if ((wbTemp &lt; 79 ) &amp;&amp; (wbTemp &gt;= 77)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor78[i])) { if (i == 6) { count = 0; } else { count = (i+1); } } } } tableButton = new JButton(new ImageIcon(tablesFor78[count], tablesFor78[count])); } else if ((wbTemp &lt; 77) &amp;&amp; (wbTemp &gt;= 75)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor76[i])) { if (i == 6) { count = 0; } else { count = (i+1); } } } } tableButton = new JButton(new ImageIcon(tablesFor76[count], tablesFor76[count])); } else if ((wbTemp &lt; 75) &amp;&amp; (wbTemp &gt;= 73)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor74[i])) { if (i == 6) { count = 0; } else { count = (i+1); } } } } tableButton = new JButton(new ImageIcon(tablesFor74[count], tablesFor74[count])); } else if ((wbTemp &lt; 73) &amp;&amp; (wbTemp &gt;= 71)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor72[i])) { if (i == 6) { count = 0; } else { count = (i+1); } } } } tableButton = new JButton(new ImageIcon(tablesFor72[count], tablesFor72[count])); } else if ((wbTemp &lt; 71) &amp;&amp; (wbTemp &gt;= 69)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor70[i])) { if (i == 6) { count = 0; } else { count = (i+1); } } } } tableButton = new JButton(new ImageIcon(tablesFor70[count], tablesFor70[count])); } else if ((wbTemp &lt; 69) &amp;&amp; (wbTemp &gt;= 67)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor68[i])) { if (i == 6) { count = 0; } else { count = (i+1); } } } } tableButton = new JButton(new ImageIcon(tablesFor68[count], tablesFor68[count])); } tableButton.setRolloverEnabled(false); add(tableButton, BorderLayout.CENTER); } else if (e.getSource() == prevButton) { String t = tableButton.getText(); tableButton.updateUI(); String s = ((ImageIcon)tableButton.getIcon()).toString(); if ((wbTemp &gt;= 79) &amp;&amp; (wbTemp &lt; 82)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor80[i])) { if (i == 0) { count = 6; } else { count = (i-1); } } } } tableButton = new JButton(new ImageIcon(tablesFor80[count], tablesFor80[count])); } else if ((wbTemp &lt; 79 ) &amp;&amp; (wbTemp &gt;= 77)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor78[i])) { if (i == 0) { count = 6; } else { count = (i-1); } } } } tableButton = new JButton(new ImageIcon(tablesFor78[count], tablesFor78[count])); } else if ((wbTemp &lt; 77) &amp;&amp; (wbTemp &gt;= 75)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor76[i])) { if (i == 0) { count = 6; } else { count = (i-1); } } } } tableButton = new JButton(new ImageIcon(tablesFor76[count], tablesFor76[count])); } else if ((wbTemp &lt; 75) &amp;&amp; (wbTemp &gt;= 73)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor74[i])) { if (i == 0) { count = 6; } else { count = (i-1); } } } } tableButton = new JButton(new ImageIcon(tablesFor74[count], tablesFor74[count])); } else if ((wbTemp &lt; 73) &amp;&amp; (wbTemp &gt;= 71)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor72[i])) { if (i == 0) { count = 6; } else { count = (i-1); } } } } tableButton = new JButton(new ImageIcon(tablesFor72[count], tablesFor72[count])); } else if ((wbTemp &lt; 71) &amp;&amp; (wbTemp &gt;= 69)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor70[i])) { if (i == 0) { count = 6; } else { count = (i-1); } } } } tableButton = new JButton(new ImageIcon(tablesFor70[count], tablesFor70[count])); } else if ((wbTemp &lt; 69) &amp;&amp; (wbTemp &gt;= 67)) { if (t.equals("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables.")) { count = 0; } else { for (int i = 0; i &lt;= 6; i++) { if (s.equals(tablesFor68[i])) { if (i == 0) { count = 6; } else { count = (i-1); } } } } tableButton = new JButton(new ImageIcon(tablesFor68[count], tablesFor68[count])); } tableButton.setRolloverEnabled(false); add(tableButton, BorderLayout.CENTER); } } } </code></pre> <p>the issue is with this statement in a method that is called the body of it is too long for me to add it</p> <pre><code>else { tableButton = new JButton("Cannot Find Model for Variables Given. Adjust or Scroll to Look Through Tables."); } } </code></pre>
 

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