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PO'SwingUtilities.updateComponentTreeUI(this)' removes custom Document from JComboBox
 

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  1. PO'SwingUtilities.updateComponentTreeUI(this)' removes custom Document from JComboBox
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    <p>I have an editable JComboBox and JTextField. Both with custom Documents. Here is the code:</p> <pre><code>import java.awt.*; import javax.swing.*; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.PlainDocument; public class SwingUtilStrangeBehav extends JFrame { public SwingUtilStrangeBehav() { JComboBox&lt;String&gt; combo = new JComboBox&lt;&gt;(new String[]{"a", "b", "c"}); combo.setEditable(true); ((JTextField)combo.getEditor().getEditorComponent()).setDocument(new PlainDocument() { private static final long serialVersionUID = 1L; @Override public void insertString(int offs, String str, AttributeSet a) throws BadLocationException { System.out.println("New text inserted into combo!"); super.insertString(offs, str, a); } }); JTextField field = new JTextField(); field.setDocument(new PlainDocument() { private static final long serialVersionUID = 1L; @Override public void insertString(int offs, String str, AttributeSet a) throws BadLocationException { System.out.println("New text inserted into text!"); super.insertString(offs, str, a); } }); Container c = getContentPane(); c.setLayout(new BoxLayout(c, BoxLayout.PAGE_AXIS)); c.add(combo); c.add(Box.createRigidArea(new Dimension(0, 5))); c.add(field); //SwingUtilities.updateComponentTreeUI(this); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); pack(); setLocationRelativeTo(null); setVisible(true); } public static void main(String arg[]) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { new SwingUtilStrangeBehav(); } }); } } </code></pre> <p>Then I input some text in JComboBox or JTextField I get the following output in my console, for example:</p> <p><em>New text inserted into combo!</em><br> <em>New text inserted into text!</em></p> <p>That's great! When I uncomment the following line <strong>SwingUtilities.updateComponentTreeUI(this);</strong> and run this programm, I can only get this output:<br><br> <em>New text inserted into text!</em></p> <p>It seems that JComboBox's Document was removed. Why was custom Document removed and how to solve this problem? I want that custom Document would still be in JComboBox after executing <strong>SwingUtilities.updateComponentTreeUI(this);</strong>. </p> <p>FYI: I use <strong>SwingUtilities.updateComponentTreeUI(this);</strong> to apply new Font to Container.</p>
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    1. COTry to use `revalidate()` and `repaint()` instead of `SwingUtilities.updateComponentTreeUI()`.
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      1. PO'SwingUtilities.updateComponentTreeUI(this)' removes custom Document from JComboBox
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    2. CO`SwingUtilities.updateComponentTreeUI(Component c)` does that what you've suggested. It invokes updateUI() for all components in the Container and after that it executes these three methodes: `c.invalide(); c.validate(); c.repaint();`. It seems for me that such kind of behavior of the method `updateComponentTreeUI(Component c)` is a Java bug.
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      1. USpolis
 

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