Could you please throw only java.lang.ClassFormatError when classfile is invalid,
it is easier than update apiCover.

To check this it is possible to generate coverage for vm.classfmt tests.
TCK=/set/java/re/jck/6b/nightly/binaries/latest/JCK-runtime-6b/classes
#TCK=/java/re/jck/6/archive/fcs/binaries/JCK-runtime-6/classes


java -Xmx512m -cp apiCover.jar:sigtestdev.jar com.sun.tdk.apiCover.Main \
-api j2se60_all.sig -tck $TCK \
-apiinclude java.lang.Object \
-tckinclude javasoft.sqe.tests.vm.classfmt \
-tckinclude javasoft.sqe.tests.vm.concepts \
-debug -mode r -detail 1 -report res.txt