Selim :
Due to a bug in the sigar library version I am using (returns bogus values for swap), I tried using com.sun.management.OperatingSystemMXBean instead. This worked fine and gave me the desired results (on Windows).
Class<?> sunMxBeanClass = Class.forName("com.sun.management.OperatingSystemMXBean");
sunMxBeanInstance = sunMxBeanClass.cast(ManagementFactory.getOperatingSystemMXBean());
getFreeSwapSpaceSize = getMethodWithName(sunMxBeanClass, "getFreeSwapSpaceSize");
getTotalSwapSpaceSize = getMethodWithName(sunMxBeanClass, "getTotalSwapSpaceSize");
However this breaks with java 9. Is there another way to query swap file / partition information using java? I don't want to introduce a new library or version of sigar.
Cross platform solutions appreciated but windows is enough :--)
Thanks
Holger :
You may try to discover available MX attributes dynamically:
public class ExtendedOsMxBeanAttr {
public static void main(String[] args) {
String[] attr={ "TotalPhysicalMemorySize", "FreePhysicalMemorySize",
"FreeSwapSpaceSize", "TotalSwapSpaceSize"};
OperatingSystemMXBean op = ManagementFactory.getOperatingSystemMXBean();
List<Attribute> al;
try {
al = ManagementFactory.getPlatformMBeanServer()
.getAttributes(op.getObjectName(), attr).asList();
} catch (InstanceNotFoundException | ReflectionException ex) {
Logger.getLogger(ExtendedOsMxBeanAttr.class.getName())
.log(Level.SEVERE, null, ex);
al = Collections.emptyList();
}
for(Attribute a: al) {
System.out.println(a.getName()+": "+a.getValue());
}
}
}
There is no dependency to com.sun classes here, not even a reflective access.
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