Sometimes you just need javac to be more lenient and bend the rules a little.
This version of javac completely ignores exception issues. It will happily let you compile code that throws without throws ... declarations, override a method which doesn't throw with a method that does, etc...
You won't get errors, not even warnings.
Same idea as project lombok's experiment but with a simple patch on top of the openjdk sources.
See Releases for jdk 1.8.0_65 build.
Patch and OpenJDK sources are in 1.8.0_65 branch.
Build:
$ git checkout 1.8.0_65
# Edit make/build.properties, set boot.java.home to your jdk home
$ cd make ; ant
# javac is in built/dist/bootstrap/bin/javac
If you need it for another jdk version:
$ hg clone http://hg.openjdk.java.net/jdk8u/jdk8u/langtools
$ hg checkout jdk8u65-b17 # or whatever version you need
# apply patch from 1.8.0_65 branch and build