system.cpu.usage missing with OpenJ9 0.33.0

[BingTang70]

Hi,

There is a recently changes in OpenJ9 the method getSystemCpuLoad() removed from com.ibm.lang.management.OperatingSystemMXBean and inherited from com.sun.management.OperatingSystemMXBean
this cause the ProcessorMetrics.java stop working, which can not return the metric system.cpu.usage

The method detectMethod invoke getDeclaredMethod() it does not return the inherite methods , if change to getMethod will resolve this issue.

    @Nullable
    private Method detectMethod(String name) {
        requireNonNull(name);
        if (operatingSystemBeanClass == null) {
            return null;
        }
        try {
            // ensure the Bean we have is actually an instance of the interface
            operatingSystemBeanClass.cast(operatingSystemBean);
            return operatingSystemBeanClass.getDeclaredMethod(name);
        }
        catch (ClassCastException | NoSuchMethodException | SecurityException e) {
            return null;
        }
    }

Thanks

Bing

[shakuzen]

Thanks for reporting the issue and sorry for the trouble. I don't think there was a good reason I used getDeclaredMethod instead of getMethod so we can fix that.
Linking to eclipse-openj9/openj9#15685