How can I get a java apps to use the GTK+ theme?

Question

Is there a way to get java apps to use my gtk theme?

Answer 1

You can try to set Java's default look and feel to GTK:

Open a terminal ( Ctrl + Alt + T ) and paste the upper one for openjdk and the lower one for sun java .

gksu gedit /usr/lib/jvm/java-6-openjdk/jre/lib/swing.properties

gksu gedit /usr/lib/jvm/java-6-sun/jre/lib/swing.properties

• Follow the comment in that file and remove the hash sign, so it looks like:

  # uncomment to set the default look and feel to GTK
  swing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel
  

• Save and restart the java app.

Before and after:

Answer 2

If you are the developer or it's an open source, an alternative way is to change the look and feel of the application. Insert the below code in the main method.

for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
    if ("com.sun.java.swing.plaf.gtk.GTKLookAndFeel".equals(info.getClassName())) {   
       javax.swing.UIManager.setLookAndFeel(info.getClassName());
       break;
     } 
}

This may be also helpful.