code: public synchronized final void setClassShutter(ClassShutter shutter)
      {
          if (sealed) onSealedMutation();
          if (shutter == null) throw new IllegalArgumentException();
          if (hasClassShutter) {
              throw new SecurityException("Cannot overwrite existing " +
                                          "ClassShutter object");
          }
          classShutter = shutter;
          hasClassShutter = true;
      }
docs: Set the LiveConnect access filter for this context.
  <p> {@link ClassShutter} may only be set if it is currently null.
  Otherwise a SecurityException is thrown.
  @param shutter a ClassShutter object
  @throws SecurityException if there is already a ClassShutter
  object for this Context