Java: 1.7.0-ea; Java HotSpot(TM) Client VM 21.0-b02
System: Windows XP version 5.1 running on x86; Cp1250; en_US (nb)

Way to reproduce from cmd line:
1) Create a class like xx����aa.Xx����aa in your project and build the project.
2) In the cmd line run: java.exe -cp build\classes xx����aa.Xx����aa
when the java is JDK 1.6 it works fine and class is executed when it's JDK 1.7
it crashes.