http://happilyblogging.wordpress.com/2012/10/04/not-a-valid-glassfish-server-installation-netbeans/

Essentially, you must stop the gf3 server and rename the console-core-X.X.X.jar located in \glassfish3\glassfish\lib\install\applications__admingui\WEB-INF\lib to console-core-3.1.2.jar

//改成该版本的netbeans能够集成的版本.

netbeans添加GF 出现无效的服务器安装位置