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import java.util.Arrays;
import java.util.Properties;
import java.util.Set;
import javax.management.ObjectName;
import javax.management.j2ee.ManagementHome;
import javax.management.j2ee.Management;
import javax.management.j2ee.statistics.JVMStats;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
public class HeapSizeRetriever {
public static void main(String args[]) {
try {
Properties props = new Properties();
props.setProperty(Context.PROVIDER_URL, "iiop://glenan:9999");
Context ic = new InitialContext(props);
Object obj = ic.lookup("ejb/mgmt/MEJB");
ManagementHome mejbHome = (ManagementHome) PortableRemoteObject
.narrow(obj, ManagementHome.class);
Management mejb = mejbHome.create();
ObjectName jvmQuery = new ObjectName("*:j2eeType=JVM,*");
Set s = mejb.queryNames(jvmQuery, null);
ObjectName jvmMBean = (ObjectName) s.iterator().next();
boolean hasStats = ((Boolean) mejb.getAttribute(jvmMBean,
"statisticsProvider")).booleanValue();
if (hasStats) {
JVMStats stats = (JVMStats) mejb
.getAttribute(jvmMBean, "stats");
String[] statisticNames = stats.getStatisticNames();
if (Arrays.asList(statisticNames).contains("heapSize")) {
System.out.println("Heap size: " + stats.getHeapSize());
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
} |
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