_extends = null; _fields = null; _identities = null; _depends = null; _accessMode = null;
if ( fields == null ) throw new IllegalArgumentException( "Argument 'fields' is null" ); _fields = (FieldDescriptor[]) fields.clone(); _accessMode = accessMode; _depends = depend;
    protected ClassDescriptorImpl( Class javaClass )    {        _javaClass = javaClass;        _extends = null;        _fields = null;        _identities = null;        _depends = null;        _accessMode = null;    }