I just installed Eclipse standard 4.4 Luna, and after installing the Scala IDE and friends I get
JDT Weaving is currently disabled. The Scala IDE needs JDT Weaving to be active,
or it will not work correctly.
Activate JDT Weaving and Restart Eclipse? (Highly Recommended)
[OK] [Cancel]
Does anyone know how to do this?
Now my comments on this error message
https://groups.google.com/forum/#!msg/scala-ide-user/7GdTuQHyP4Q/aiUt70lnzigJ
I had the same problem with Eclipse Luna. Your problem might be due to installing the plugin for wrong version of Eclipse.
Did you install Scala plugin from this page: Download the 3.0 Release of the Scala IDE for Eclipse? It is for Juno and Kepler only.
I downloaded the plugin from the link at Download the Latest Nightly Build, using http://download.scala-ide.org/nightly-scala-ide-luna-211x. And it works perfectly now.
Hope this helps :)