Tested with a few version of ecj, I think it might build/compile with 4.x at some point. But till then, likely need to filter ecj out or something to prevent others from running into this issue. See attached build.log
Created attachment 290285 [details] netbeans-profiler-7.0.1 using ecj-3.7 build.log
filtered out all ecj compilers in all netbeans 7+ ebuilds. thanks for reporting.