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POJComboBox causes a runtime error
 

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  1. POJComboBox causes a runtime error
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    <p>I'm trying some GUI development in Java and when I added the following code, I got a runtime error during initialization of the class:</p> <pre><code>public class Search_Album_Main_Tab extends JPanel{ JComboBox search_list; JTextArea searched_data; JButton search_button; Results_Main_Tab rmt; Search_Action_Listener listener; public Search_Album_Main_Tab(Results_Main_Tab results_main_tab) { String[] search_options = {"Album", "Artist", "Genre", "ID", "Year"}; setLayout(new GridLayout(3,1)); rmt = results_main_tab; listener = new Search_Action_Listener(); /* Searched data */ searched_data = new JTextArea(); /* Search button */ search_button = new JButton("Search Album"); search_button.addActionListener(listener); /* Drop down menu */ search_list = new JComboBox(search_options); add(search_list); add(searched_data); add(search_button); } private class Search_Action_Listener implements ActionListener { public void actionPerformed(ActionEvent event) { if (event.getSource() == search_button) { } } } } </code></pre> <p>The error I get is:</p> <pre><code>dcm_gui.GUI at localhost:53806 Thread [main] (Suspended (exception NullPointerException)) CUIAquaComboBox.applySizeFor(JComponent, CoreUIConstants$Size) line: 454 CUIAquaUtilControlSize.applyUISizing(JComponent, CoreUIConstants$Size) line: 99 CUIAquaUtilControlSize.access$200(JComponent, CoreUIConstants$Size) line: 13 CUIAquaUtilControlSize$PropertySizeListener.applyComponentSize(JComponent, Object) line: 121 CUIAquaUtilControlSize.addSizePropertyListener(JComponent) line: 25 CUIAquaComboBox.installListeners() line: 47 CUIAquaComboBox(BasicComboBoxUI).installUI(JComponent) line: 229 CUIAquaComboBox.installUI(JComponent) line: 30 JComboBox(JComponent).setUI(ComponentUI) line: 653 JComboBox.setUI(ComboBoxUI) line: 238 JComboBox.updateUI() line: 247 JComboBox.init() line: 212 JComboBox.&lt;init&gt;(Object[]) line: 178 Search_Album_Main_Tab.&lt;init&gt;(Results_Main_Tab) line: 36 GUI.main(String[]) line: 28 Daemon Thread [AWT-AppKit] (Running) /System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Home/bin/java (Oct 10, 2010 11:55:27 PM) </code></pre> <p>Does anyone has any idea why?</p> <p>Binyamin</p>
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    1. COYou're trying to call a method, or access a field, of an object which is `null`, somewhere in the `Search_Album_Main_Tab` constructor. What's at line 36?
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    2. COThanks, I can see that, but I don't see anything that I didn't initialize before using. In this specific case I used the constructor with a defined string array.
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    3. COLine 36 is `search_list = new JComboBox(search_options);`, and search_options is a string array: `String[] search_options = {"Album", "Artist", "Genre", "ID", "Year"};`
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