StandardMBeanIntrospector.java 文件源码

@Override
Descriptor getBasicMBeanDescriptor() {
    /* We don't bother saying mxbean=false, and we can't know whether
       the info is immutable until we know whether the MBean class
       (not interface) is a NotificationBroadcaster. */
    return ImmutableDescriptor.EMPTY_DESCRIPTOR;
}