OpenMBeanAttributeInfoSupport.java 文件源码

static <T> T valueFrom(Descriptor d, String name, OpenType<T> openType) {
    Object x = d.getFieldValue(name);
    if (x == null)
        return null;
    try {
        return convertFrom(x, openType);
    } catch (Exception e) {
        final String msg =
            "Cannot convert descriptor field " + name + "  to " +
            openType.getTypeName();
        throw EnvHelp.initCause(new IllegalArgumentException(msg), e);
    }
}