On 18/06/2021 4:35 pm, Alan Bateman wrote:
On 17/06/2021 22:44, David Holmes wrote:
I must admit I'm a bit confused about these implementation-specific
MBeans. They are implementation-specific, so no part of the primary
java.management namespace, but they are provided so that they can be
used - so shutting them behind the modular doors (so to speak) really
doesn't make much sense to me.
The JDK-specific MBeans are in the com.sun.management package, exported
by the jdk.management module. The sun.management.* classes have always
been JDK-internal implementation classes and were never mean to be used
directly by code outside of the JDK. Directly referencing these classes
would have been a warning at compile prior with JDK 8 and older. It
changed an error at compile time in JDK 9.
Ah! I now see:
/**
* This method is for testing only.
*/
public static synchronized HotspotRuntimeMBean
getHotspotRuntimeMBean() {
if (hsRuntimeMBean == null) {
hsRuntimeMBean = new HotspotRuntime(jvm);
}
return hsRuntimeMBean;
}
in sun.management.ManagementFactoryHelper. So it seems there is no
actual _use_ of these platform-specific MBeans even within the JDK. So
their existence seems somewhat pointless.
Cheers,
David
-Alan
