This concerns the state of Struts2 framework tooling, although currently I use no IDE plug-in, preferring to create projects with maven from scratch. At one time I did use the Netbeans Struts2 plugin but stopped when support lapsed for a time between IDE releases.
It is important to know the state of current tooling and so ask:
What features are offered by the Struts2 IDE framework plugin for your IDE(s)?
Are there any design issues with the plugin? (flaws such as wanting to include old or outdated libraries)
This answer applies to the the Netbeans plugin found here: http://plugins.netbeans.org/plugin/39218 (at time of writing the last updated was : 2011-12-17)
Features
You now have the option of adding struts2 support, which can product a struts2 demo project.
Issues and Limitations
Over all I do not recommend this plug-in over a standard Maven Project and manually adding the dependencies.