Glassfish v1 is well integrated with Netbeans 5.5. Actually it is not really necessary - to deploy an application you have only to drop the archive into the folder: [glassfish_home]domains\domain1\autodeploy.
But deploying from the IDE EJB 3 and starting glassfish automatically, debugging JSPs, view servlet code of a corresponding JSP or access to the datasources, pools etc. simplifies the development. I tried to integrate Glassfish v2 with netbeans 5.5 - the installation was successful but it didn't work afterwards.
I found the solution in vince kraemer's post - the installation netbeans 5.5.1 :-).
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