How to disable the automatic HTML support of JLabel?

Question

A Swing JLabel automatically interprets any text as HTML content, if it starts with . If the content of this HTML is an image with invalid URL this will cause th

Answer 1

There is a way if you create your own look and feel.
I'm not sure how well this performs is this, but it works. Lets assume you will extend the "Classic Windows" L&F.You need at leas 2 classes One is the Look&Feel itself, lets call it WindowsClassicLookAndFeelExt. You only need to override method initClassDefaults.

package testSwing;

import javax.swing.UIDefaults;
import com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel;

public class WindowsClassicLookAndFeelExt extends WindowsClassicLookAndFeel    {
    @Override protected void initClassDefaults(UIDefaults table){
        super.initClassDefaults(table);
        Object[] uiDefaults = { "LabelUI", WindowsLabelExtUI.class.getCanonicalName()};
        table.putDefaults(uiDefaults);
    }
}

You also need a WindowsLabelExtUI class to manage all JLabels and set the property:

package testSwing;
import javax.swing.JComponent;
import javax.swing.plaf.ComponentUI;
import com.sun.java.swing.plaf.windows.WindowsLabelUI;

public class WindowsLabelExtUI extends WindowsLabelUI{
    static WindowsLabelExtUI singleton = new WindowsLabelExtUI();

    public static ComponentUI createUI(JComponent c){
        c.putClientProperty("html.disable", Boolean.TRUE);    
        return singleton;
    }
}

And finally a test class when you set the theme as WindowsClassicLookAndFeelExt

package testSwing;

import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.UIManager;


public class Main{
    public static void main(String[] args){
        try{                UIManager.setLookAndFeel(WindowsClassicLookAndFeelExt.class.getCanonicalName());
        }catch (Exception e){
            e.printStackTrace();
        }

        JFrame frame = new JFrame("JList Test");
        frame.setLayout(new FlowLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        String[] selections = {"", "
Hello
", "orange", "dark blue"};

        JList list = new JList(selections);

        list.setSelectedIndex(1);
        System.out.println(list.getSelectedValue());

        JLabel jLabel = new JLabel("
standard Label
");
        frame.add(new JScrollPane(list));
        frame.add(jLabel);
        frame.pack();

        frame.setVisible(true);
    }
}

And you will see something like