JRebel is a tool which has saved us uncountable* hours of development time by allowing us to skip the step where we restart our Weblogic servers to test a new feature as we develop it.
The word about JRebel has apparently gotten out, because the developer behind it, ZeroTurnaround, has recently won the 2011 innovation award from JAX awards.
As an early adoptor and frequent user of their flagship product, I am happy to see them take the award home. If you have not had a chance to integrate JRebel into your server-side Java development process, I recommend you try it out.
Links:
Award posting: http://www.zeroturnaround.com/blog/jrebel-the-most-innovative-java-technology-of-2011/
* They are counted on a per-developer basis, but I do not have the totals for our entire company.
