I have a class file with a field whose 0x0800 flag bit is set. In 21, javap accepts the class file and (in verbose mode) prints the flag value. In 22, javap reports a "fatal error".

Not sure if this is by design or a side-effect of some other change, but this is a valid class file per JVMS ("All bits of the access_flags item not assigned ... should be ignored by Java Virtual Machine implementations"), so it seems like the old behavior is more appropriate.

> `javahome 21`/bin/javap classes/StrictField.class
Compiled from "StrictField.jasm"
public class StrictField {
  final int x;
  final int y;
  public StrictField();
}

> `javahome 22`/bin/javap classes/StrictField.class
Compiled from "StrictField.jasm"
public class StrictField {
Error: Fatal error: Unmatched bit position 0x800 for location FIELD

> `javahome 21`/bin/javap -v classes/StrictField.class
...
  final int x;
    descriptor: I
    flags: (0x0810) ACC_FINAL, 0x800
...