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After instaling or activating the plugin: phpMD / PHP CodeSniffer Plugin it installs a new button in the Main toolbar. This icon called Scan File (with an eye icon) if you click on it it will throw null exception. I tested it couple of times and i was able to reproduce the error. java.lang.NullPointerException http://plugins.netbeans.org/plugin/40282
Thank you, just found the reason, if no php-qa tool is installed at all, the fail over did not work as expected. This is fixed in latest version now.