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project properties -> run configuration -> advanced web configuration Components with no mnemonic : Class: javax.swing.JButton { Cancel | Cancel button } [468,441] Class: javax.swing.JButton { OK | OK button } [408,441] Class: javax.swing.JLabel { URL Preview | The default URL preview. } [103,62]
There is following rule for mnemonics of OK/Cancel buttons: "Do not associate mnemonics with the default button or the Cancel button in a dialog box. Use Enter or Return for the default button and Escape for the Cancel button instead" (for details see http://java.sun.com/products/jlf/ed2/book/index.html) If the dialog uses Enter/Escape for OK/Cancel then first 2 items of the report are irrelevant.
According the comment by Jára, this issue is INVALID (moreover, OK & Vancel buttons come from project support, not from PHP). URL preview does not have any mnemonic, it is just a preview of a URL ;)