import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;

    /**
     * @author Peter Salomonsen
     */

public class MemoryUsageMonitor {    
    public static void main(String[] args) throws Exception  {
        MemoryMXBean mx = ManagementFactory.getMemoryMXBean();
        
        mx.setVerbose(true);
        
        Driver driver = (Driver)
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        DriverManager.registerDriver(driver);

        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "");
        
        while(true)
        {
            System.out.println(mx.getHeapMemoryUsage());
            con.createStatement().execute("SELECT 1");
            mx.gc();
        }
    }
}