OpenMBeanAttributeInfoSupport.java 文件源码

static <T> Comparable<?> comparableValueFrom(Descriptor d, String name,
                                             OpenType<T> openType) {
    T t = valueFrom(d, name, openType);
    if (t == null || t instanceof Comparable<?>)
        return (Comparable<?>) t;
    final String msg =
        "Descriptor field " + name + " with value " + t +
        " is not Comparable";
    throw new IllegalArgumentException(msg);
}