a method with access flags ACC_ABSTRACT and ACC_STRICT is illegal if version less than V17
CheckClassAdapter currently does not check if that a method access_flags with ACC_ABSTRACT and ACC_STRICT is illegal. Furthermore, the JVM spec of Java 17 now ignores ACC_STRICT thus ACC_ABSTRACT | ACC_STRICT becomes a valid combination for classfile version >= V17
Edited by Remi Forax