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    <p>This is bug in Oracle JDK 7 (it cannot be reproduced in Open JDK 7 by the way).</p> <p>To fix this you can make a workaround (yes, this is just a workaround, there is no guarantees that it won't break with some Java update) so that the window created for popup-menu will become non-opaque as soon as it shows up, then it will be displayed properly. Atleast for now. Here is how this can be done for Java version 7 and later:</p> <pre><code>PropertyChangeListener propertyChangeListener = new PropertyChangeListener () { @Override public void propertyChange ( final PropertyChangeEvent evt ) { if ( evt.getNewValue () == Boolean.TRUE ) { // Retrieving popup menu window (we won't find it if it is inside of parent frame) final Window ancestor = getWindowAncestor ( popupMenu ); if ( ancestor != null &amp;&amp; ancestor.getClass ().getCanonicalName ().endsWith ( "HeavyWeightWindow" ) ) { // Checking that parent window for our window is opaque, only then setting opacity final Component parent = ancestor.getParent (); if ( parent != null &amp;&amp; parent instanceof Window &amp;&amp; parent.getBackground ().getAlpha () == 0 ) { // Making popup menu window non-opaque ancestor.setBackground ( new Color ( 0, 0, 0, 0 ) ); } } } } private Window getWindowAncestor ( Component component ) { if ( component == null ) { return null; } if ( component instanceof Window ) { return ( Window ) component; } for ( Container p = component.getParent (); p != null; p = p.getParent () ) { if ( p instanceof Window ) { return ( Window ) p; } } return null; } }; popupMenu.addPropertyChangeListener ( "visible", propertyChangeListener ); </code></pre> <p>You will have to put some more effort if you also want to support JDK 6- versions because that code won't even compile on earlier JDK versions (there are no "set/getBackground" methods in Window in earlier versions).</p>
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    1. COGREAT it works for me, but checking *parent.getBackground ().getAlpha () == 0* is not right as well. Better to check for `alpha < 255`. Anyway, thanks a lot!
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    2. CODepends on what is your target there. But its indeed better to check for < 255 in this case.
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    3. COJPopup and XxxBasicPopup should be pack() before visible
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