High CPU usage when JRebel is on

Question

When turning on JRebel for my JSF project, CPU usage gets too high on each requests & drops down when request has been served. I did looked though the profiler but it was not caused due to my project classes itself. But I could even figure out the culprit looking at the profiling results. Here are the profiling results :

Interestingly the problem disappears when I

1. either disable JRebel,
2. or remove a 3rd party URL rewrite library (com.ocpsoft.pretty.faces.*).

But then I created a new fresh netbeans project without disabling either of the above two, & but still the problem is not there, which expectedly should have been.

Any idea what may be causing this ?

Edit:

Seems Prettyfaces (com.ocpsoft.pretty.faces) URL rewrite library is the culprit anyway.. See this snapshot:

But why this happens only when Jrebel is on ??

Answer 1

The problem is in JRebel 5.5.0 prettyfaces plugin, you can either disable it, or use JRebel nightly build (or JRebel 5.5.1+ once available), which contains the fixed version.

http://zeroturnaround.com/software/jrebel/download/early-access/

Answer 2

I also ran into this. This is definitely an issue with JRebel 5.5.0.

I worked around this problem by using JRebel 5.4.2 instead.