With this code:

  class DummyJComponent extends javax.swing.JComponent {
  }

...
DummyJComponent lw = new DummyJComponent();
lw.getColorModel();
...

In Headless mode, a Headless exception is thrown:

  !! FAIL: java.awt.Component: do_getColorModel_50 status=fail with exception=java.awt.HeadlessException
java.awt.HeadlessException
        at sun.awt.HeadlessToolkit.getColorModel(HeadlessToolkit.java:182)
        at java.awt.Component.getColorModel(Component.java:1392)
        at java_awt_Component.do_getColorModel_50(java_awt_Component.java:1445)
        at java_awt_Component.run(java_awt_Component.java:3508)
        at java.lang.Thread.run(Thread.java:579)

This happens for every Component subclass.

The javadoc does not indicate this method throws any exception at all.
(see file:/usr/local/java/jdk1.4/doc/api/java/awt/Component.html#getColorModel())

There's probably a good reason for throwing the exception, it simply
should be documented.