본 절에서는 JNDI를 사용해서 JEUS를 모니터링하는 JMX 애플리케이션에 대해서 설명한다.

각 서버는 기동할 때 JMX 연결을 맺기 위해 필요한 정보를 담고 있는 javax.naming.Reference 객체를 JNDI에 등록한다. 등록할 때 사용하는 이름은 "mgmt/rmbs/adminServer"와 같은 형식을 가진다. 사용자는 JNDI에 등록되어 있는 Reference를 통해 MBean 서버와 연결을 맺을 수 있다.

다음은 JNDI를 사용하는 클라이언트 예제이다.

package jmxclient;

import java.util.Set;
import java.util.Iterator;
import java.util.Hashtable;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.naming.Context;
import javax.naming.InitialContext;

/**
 * JMX Client which uses JNDI lookup.
 */
public class JMXClientUsingJndi {

    public static void main(String args[]) throws Exception {
        if(args.length < 4) {
            System.out.println("Required arguments: " 
                + "hostname username password target-name");
            return;
        }
        
        // Step 1. Setting Environments
        String hostname = args[0];
        String username = args[1];
        String password = args[2];

        // targetName could be server name,
        // for example, "adminServer", "server1"
        String targetName = args[3];
        
        Hashtable env = new Hashtable();
        env.put(Context.INITIAL_CONTEXT_FACTORY, "jeus.jndi.JEUSContextFactory");
        env.put(Context.PROVIDER_URL, hostname);
        env.put(Context.SECURITY_PRINCIPAL, username);
        env.put(Context.SECURITY_CREDENTIALS, password);

        // Step 2. Getting MBeanServerConnection
        InitialContext ctx = new InitialContext(env);
        JMXConnector connector = (JMXConnector)ctx.lookup("mgmt/rmbs/" + targetName);
        MBeanServerConnection mbeanServer = connector.getMBeanServerConnection();

        // Step 3. Query
        ObjectName jeusScope = new ObjectName("JEUS:*");
        Set objectNames = mbeanServer.queryNames(jeusScope, null);

        // Step 4. Handling the Query Result
        for(Iterator i = objectNames.iterator(); i.hasNext();) {
            System.out.println("[MBean] " + i.next());
        }
    }
} 

위 예제를 작성한 후 컴파일하여 실행하면 JEUS 서버에 접속한 후 "JEUS:*"에 해당하는 MBean들의 목록을 출력한다. 예제 프로그램은 인자를 4개 받는데, 첫 번째는 서버의 hostname, 두 번째는 JEUS 사용자 이름, 세 번째는 비밀번호, 마지막은 서버 이름이다.

$ java -classpath .:${JEUS_HOME}/lib/client/jclient.jar jmxclient.JMXClientUsingJndi 127.0.0.1:9736 jeus jeus adminServer

[2016.05.28 15:20:24][2] [t-1] [NET-0002] Beginning to listen to NonBlockingChannelAcceptor: /127.0.0.1:9756.
[MBean] JEUS:j2eeType=JeusService,jeusType=ThreadPool,JMXManager=adminServer,
J2EEServer=adminServer,name=threadpool.System
[MBean] JEUS:j2eeType=JeusService,jeusType=JEUSMPConnector,JMXManager=adminServer,
J2EEServer=adminServer,name=adminServer
[MBean] JEUS:j2eeType=JeusService,jeusType=JMSDestinationResource,
JMXManager=adminServer,J2EEServer=adminServer,JMSResource=adminServer_jms,
name=ExamplesQueue
[MBean] JEUS:j2eeType=JeusService,jeusType=JeusLogService,JMXManager=adminServer,
J2EEServer=adminServer,name=adminServer
[MBean] JEUS:j2eeType=JeusService,jeusType=ThreadPool_WEBC,JMXManager=adminServer,
WebEngine=adminServer_servlet,J2EEServer=adminServer,WebListener=http1,name=http1
[MBean] JEUS:j2eeType=JeusService,jeusType=SecurityDomain,JMXManager=adminServer,
J2EEDomain=domain1,SecurityService=SecurityService,name=SYSTEM_DOMAIN
[MBean] JEUS:j2eeType=JeusService,jeusType=DeploymentPlanManagementService,
JMXManager=adminServer,J2EEDomain=domain1,name=adminServer
[MBean] JEUS:j2eeType=JeusService,jeusType=JMSConnectionFactoryResource,
JMXManager=adminServer,J2EEServer=adminServer,JMSResource=adminServer_jms,
name=ConnectionFactory
[MBean] JEUS:j2eeType=JeusService,jeusType=JMSEngine,JMXManager=adminServer,
J2EEServer=adminServer,name=adminServer_jms
[MBean] JEUS:j2eeType=JeusService,jeusType=ServerDeploymentService,
JMXManager=adminServer,J2EEServer=adminServer,name=adminServer
. . .

본 절에서는 JMX Remote API를 사용해서 JEUS를 모니터링하는 JMX 애플리케이션에 대해서 가장 일반적으로 사용되는 방식으로 설명한다.

연결을 맺을 대상은 JMX Service URL을 통해 지정한다. JEUS MBean 서버에 연결하기 위한 URL은 아래와 같은 형태를 갖는다.

다음은 JMX Remote API를 사용하는 클라이언트 예제이다.

package jmxclient;

import java.util.Hashtable;
import java.util.Iterator;
import java.util.Set;

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import javax.naming.Context;

/**
 * JMX Client which uses JMX Remote API
 */
public class JMXClientUsingJmxUrl {
	private static final String URL_PATH = "/JeusMBeanServer";

    public static void main(String args[]) throws Exception {
        if(args.length < 4) {
            System.out.println("Required arguments: " 
                + "hostname port username password");
            return;
        }
        
        // Step 1. Setting Environments
        String address = args[0];
        int port = Integer.parseInt(args[1]);
        String username = args[2];
        String password = args[3];
        
        Hashtable env = new Hashtable();
        env.put(JMXConnectorFactory.PROTOCOL_PROVIDER_PACKAGES, "jeus.management.remote.protocol");
        env.put(Context.SECURITY_PRINCIPAL, username);
        env.put(Context.SECURITY_CREDENTIALS, password);        
        
        // Step 2. Getting MBeanServerConnection
        JMXServiceURL serviceURL = new JMXServiceURL("jmxmp", address, port, URL_PATH);
        JMXConnector connector = JMXConnectorFactory.connect(serviceURL, env);
        MBeanServerConnection mbeanServer = connector.getMBeanServerConnection();

        // Step 3. Query
        ObjectName jeusScope = new ObjectName("JEUS:*");
        Set objectNames = mbeanServer.queryNames(jeusScope, null);

        // Step 4. Handling the Query Result
        for(Iterator i = objectNames.iterator(); i.hasNext();) {
            System.out.println("[MBean] " + i.next());
        }
    }
}

위 예제를 작성한 후 컴파일하여 실행하면 JEUS 서버에 접속한 후 "JEUS:*"에 해당하는 MBean들의 목록을 출력한다. 인자는 순서대로 서버 주소, 포트, 사용자 이름, 비밀 번호이다.

$ java -classpath .:${JEUS_HOME}/lib/client/jclient.jar jmxclient.JMXClientUsingJmxUrl 127.0.0.1 9736 jeus jeus

[2016.05.28 15:21:29][2] [t-1] [NET-0002] Beginning to listen to NonBlockingChannelAcceptor: /127.0.0.1:9756.
[MBean] JEUS:j2eeType=JeusService,jeusType=ThreadPool,JMXManager=adminServer,
J2EEServer=adminServer,name=threadpool.System
[MBean] JEUS:j2eeType=JeusService,jeusType=JEUSMPConnector,JMXManager=adminServer,
J2EEServer=adminServer,name=adminServer
[MBean] JEUS:j2eeType=JeusService,jeusType=JMSDestinationResource,
JMXManager=adminServer,J2EEServer=adminServer,JMSResource=adminServer_jms,
name=ExamplesQueue
[MBean] JEUS:j2eeType=JeusService,jeusType=JeusLogService,JMXManager=adminServer,
J2EEServer=adminServer,name=adminServer
[MBean] JEUS:j2eeType=JeusService,jeusType=ThreadPool_WEBC,JMXManager=adminServer,
WebEngine=adminServer_servlet,J2EEServer=adminServer,WebListener=http1,name=http1
[MBean] JEUS:j2eeType=JeusService,jeusType=SecurityDomain,JMXManager=adminServer,
J2EEDomain=domain1,SecurityService=SecurityService,name=SYSTEM_DOMAIN
[MBean] JEUS:j2eeType=JeusService,jeusType=DeploymentPlanManagementService,
JMXManager=adminServer,J2EEDomain=domain1,name=adminServer
[MBean] JEUS:j2eeType=JeusService,jeusType=JMSConnectionFactoryResource,
JMXManager=adminServer,J2EEServer=adminServer,JMSResource=adminServer_jms,
name=ConnectionFactory
[MBean] JEUS:j2eeType=JeusService,jeusType=JMSEngine,JMXManager=adminServer,
J2EEServer=adminServer,name=adminServer_jms
[MBean] JEUS:j2eeType=JeusService,jeusType=ServerDeploymentService,
JMXManager=adminServer,J2EEServer=adminServer,name=adminServer
. . .