Gather statistics about classloader

Question

I can gather statistics like
1.No of classes loaded.
2.Memory used by the JVM.
3.Threads created about the JVM (default ClassLoader of the JVM).
I need to do the same for any generic ClassLoader.
The code I use to gather information for the JVM's ClassLoader is as follows:
import java.io.IOException;
import java.lang.management.ClassLoadingMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.net.MalformedURLException;
import javax.management.MBeanServer;
import javax.management.MBeanServerConnection;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXConnectorServer;
import javax.management.remote.JMXConnectorServerFactory;
import javax.management.remote.JMXServiceURL;
public class ClassLoading {
public static void main(String args[]) throws MalformedURLException, IOException
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
JMXServiceURL url = new JMXServiceURL("rmi", null, 0);
JMXConnectorServer cs = JMXConnectorServerFactory.newJMXConnectorServer(url, null, mbs);
cs.start();
JMXServiceURL url1 = cs.getAddress();
JMXConnector jmxc = JMXConnectorFactory.connect(url1, null);
MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();
final ClassLoadingMXBean clmb = ManagementFactory.newPlatformMXBeanProxy(mbsc, ManagementFactory.CLASS_LOADING_MXBEAN_NAME, ClassLoadingMXBean.class);
System.out.println("Loaded class count"+clmb.getLoadedClassCount());
final OperatingSystemMXBean osmxb = ManagementFactory.newPlatformMXBeanProxy(mbsc, ManagementFactory.OPERATING_SYSTEM_MXBEAN_NAME, OperatingSystemMXBean.class);
System.out.println("Name"+osmxb.getName());
}

Answer 1

Hi Nicolas. You're right that we recommend using DBMS_STATS for most statistics-gathering purposes. I'll pass this along to the writer who manages the Database Reference, to see that it gets updated. I'll also ask him to check the clarity of the column descriptions.
Regards,
Diana