Darn!
Thanks Éamonn, Did not see it :(
Eamonn McManus wrote:
> Jennifer,
>
> The problem is that the interface ClassLoadingMXBean is public but the
> implementation class sun.management.ClassLoadingImpl is not. This means
> that the method ClassLoadingMXBean.getLoadedClassCount() is accessible
> but the method sun.management.ClassLoadingImpl.getLoadedClassCount() is
> not. If you wrote ((sun.management.ClassLoadingImpl)
> clBean).getLoadedClassCount() instead of just
> clBean.getLoadedClassCount() then it would not compile, and reflection
> doesn't do anything different.
>
> If you write ClassLoadingMXBean.class.getMethod("getLoadedClassCount")
> then it should work. (Because getMethod is varargs you don't need the
> second argument.)
>
> Regards,
> Éamonn McManus/ · /JMX Spec Lead/ · /http://weblogs.java.net/blog/emcmanus/
>
>
> Jennifer Chou wrote:
>> Hi,
>>
>> I'm trying use method.invoke(..) on the MXBeans but I'm getting
>> IllegalAccessException on some but not all the MXBeans. Anybody know
>> why? And how to get around this problem?
>>
>> java.lang.management.ClassLoadingMXBean clBean =
>> ManagementFactory.getClassLoadingMXBean();
>> java.lang.reflect.Method method =
>> clBean.getClass().getMethod("getLoadedClassCount", (Class[]) null);
>> method.invoke(clBean, (Object[]) null);
>>
>> These get IllegalAccessException:
>> ClassLoadingMXBean
>> CompilationMXBean
>> GarbageCollectorMXBean
>> MemoryMXBean
>> MemoryMXBean
>>
>> These allow me to use method.invoke():
>> OperatingSystemMXBean
>> MemoryUsage
>>
>> Jennifer
> --------------------------------------------------------------------- To
> unsubscribe, e-mail: admin-unsubscribe_at_glassfish.dev.java.net For
> additional commands, e-mail: admin-help_at_glassfish.dev.java.net