I found the documentation surrounding this to be incomplete and confusing.
You need to keep an eye on
- which version of Eclipse you are using
- which version of Java you have
- which is the site Jboss where the tools reside
Jboss tools for Eclipse Luna and for Jboss EPS 6.x work on java 7 .
Do not use Jboss installation sites url or Eclipse marketplace. Use the install new software in Eclipse instead. Insert this URL “http://download.jboss.org/jbosstools/updates/webtools/luna/”