http://stackoverflow.com/questions/9600883/netbeans-7-1-icefaces-3-modules-installation-error
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I've installed Netbeans 7.1 and downloaded the icefaces mudules (ICEfaces 3.0.0 project integration plugin for NetBeans 7.1) but when i install the modules i get an error..

Some plugins require plugin J2EE Project Support Utilities to be installed. The plugin J2EE Project Support Utilities is requested in implementation version 201112071828. The following plugin is affected: ICEfaces 3

Some plugins require plugin JSF API to be installed. The plugin JSF API is requested in implementation version 201112071828. The following plugin is affected: ICEfaces Editor Support
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My observation is that the modules work on Netbeans 7.1.0 but cannot be installed in Netbeans 7.1.1.
The root cause is the restriction of Netbeans' "Friend" module used.

In this release we added new functionality, which automatically adds proper namespace declaration to facelet page while drag&drop coomponent from component palette. This function relies on some restricted netbeans' modules such as JSF API, html editor parser, etc. Unfortunately the use of these restricted modules causes this installation issue.

To resolve this issue, we have to remove this feature. Also we tried to remove dependecies as much as possible.