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    <p>The <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/Window.html#isFocusableWindow%28%29" rel="nofollow noreferrer">specification</a> says about <code>isFocusableWindow()</code> as below (I added the numbering to outline the points):</p> <blockquote> <p>public final boolean <strong><em>isFocusableWindow()</em></strong></p> <p>Returns whether this Window can become the focused Window, that is, whether this Window or any of its subcomponents can become the focus owner. For a Frame or Dialog to be focusable, its focusable Window state must be set to true. <strong>For a Window which is not a Frame or Dialog to be focusable,</strong></p> <p>i) <strong>its focusable Window state must be set to true,</strong></p> <p>ii) <strong>its nearest owning Frame or Dialog must be showing on the screen,</strong></p> <p>iii) <strong>and it must contain at least one Component in its focus traversal cycle.</strong></p> <p><strong><em>If any of these conditions is not met, then neither this Window nor any of its subcomponents can become the focus owner.</em></strong></p> </blockquote> <p>As you can see, your code doesn't meet the second rule, so your <code>JWindow</code> is not focusable. You need to have a <code>JDialog</code> or <code>JFrame</code> visible on the screen and then you can wrap it with a <code>JWindow</code>:</p> <pre><code>new JWindow(frame); </code></pre> <p>Or you may use <code>JDialog</code> or <code>JFrame</code> directly instead of <code>JWindow</code>. If you don't want the window to be decorated, just call <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/Frame.html#setUndecorated%28boolean%29" rel="nofollow noreferrer"><code>Frame.setUndecorated(true)</code></a> or <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/Dialog.html#setUndecorated%28boolean%29" rel="nofollow noreferrer"><code>Dialog.setUndecorated(true)</code></a>.</p>
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    1. CO+1 for digging up the doc _and_ come up with the solution :-)
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