GWT runtime NoSuchMethodError for sun.reflect.Reflection.getCallerClass

Problem in Java update breaks GWT - info here:
https://bugzilla.redhat.com/show_bug.cgi?id=976693

At the moment of writing this entry no stable update of java-1.7.0-openjdk exists.
But testing version (java-1.7.0-openjdk-1.7.0.25-2.3.10.5.fc17) is available and seems to work properly.
Use this for update:
sudo yum update --enablerepo=updates-testing java-1.7.0-openjdk