监控WebLogic 9.x跟10.x解决方案（监控应用服务器系列文章四）

监控WebLogic 9.x和10.x解决方案（监控应用服务器系列文章四）

前言：最近在做一个监控应用服务器（Tocmat、WebSphere、WebLogic）的项目，目前已小有规模，回头看看，一路走来，也算是磕磕绊绊，遇到过种种问题，走过不少弯路，不过程序员最不怕的就是遇到问题——有什么问题就解决什么问题。为了留下点印记，为后来人留下点经验之谈，助之少走弯路，特意把这些经验整理出来，与大家分享。

水平有限，如有疏漏，还望指正。如有疑问可以Q我：562116039。

好了，首先分享几个官方文档的地址：

——葵花宝典（放心，不需自宫）

一、使用 JMX 开发自定义管理实用工具

http://www.oraclefmw.com/wls92/jmx/index.html

这是针对WebLogic 9.2的中文版，第一好东西，里面不仅讲解有原理讲解，还有Demo和教程

二、使用JMX访问WebLogic Server MBean的Demo和教程

● WebLogic 9.x：

http://download.oracle.com/docs/cd/E13222_01/wls/docs90/jmx/accessWLS.html

● WebLogic 10.x：

http://download.oracle.com/docs/cd/E11035_01/wls100/jmx/accessWLS.html

三、WebLogic的MBean参考手册

http://download.oracle.com/docs/cd/E14571_01/apirefs.1111/e13951/core/index.html

有了MBean参考手册，想要监控什么指标，直接到里面找，纯粹是体力活，剩下的就是考虑怎么把代码写得简单可用（Clean code that works ）了

只要有了这几个地址，开发监控WebLogic 9.x和10.x的项目就变得简单了。想当年，我就是在找资料上花费了大把大把的时间，而且那绝对是相当的痛苦。如果你不是第一时间看到了这篇文章，相信你一定感同身受吧！但是恭喜你，现在你不用那么痛苦了，哈哈，开个玩笑……

◆访问WebLogic 9.x所使用的JAR包：

wlclient.jar、wljmxclient.jar

在%WL_HOME%\server\lib目录下

 

◆访问WebLogic 10.x所使用的JAR包：

由于10.x的API有变化，必须使用JarBuilder Tool生成wlfullclient.jar，具体参见官方的教程，上面的“葵花宝典”里面有链接。

 

◆监控所依赖的JAR包的存放位置

 

我们会通过这种方式获取和MBean Server的连接：

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JMXConnector connector = JMXConnectorFactory.connect(serviceURL, h);

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代码在Eclipse下通过Java程序调用没有任何问题，作为Web应用部署到Tocmat就出问题了，会报如下异常：

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Unsupported protocol: t3

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具体原因如下（这是找了很久以后在一个国外的论坛上看到的）：

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Here's the issue that I'm facing:
To get a JMX connection using JMXConnectionFactory using below: JMXConnector connector = JMXConnectorFactory.connect(serviceURL, h);
I have to rely on classes in weblogic.jar
That is because the implementation of JMXConnector is in weblogic.jar. However, the interface/abstract class for JMXConnectionFactory lives in rt.jar that comes with JDK1.5 or JDK1.6.
Because rt.jar is (probably) used by the bootstrap classloader, I HAVE to include weblogic.jar in the CATALINA_HOME/common/lib directory. If I do so, I can get the JMX part of the solution to work because both, rt.jar and weblogic.jar are loaded by the same (system) classloader.

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解决办法很简单： 将wlfullclient.jar放到Tomcat安装目录下的lib目录下即可。

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刚发现这个问题时很是诧异，始终想不通，后来在老外的一个论坛上找到类似问题，原来，JMXConnector接口是在JDK1.5/JDK1.6的rt.jar里面，而具体实现是在wlfullclient.jar里面。问题就在这里，rt.jar是由系统类加载器加载的， wlfullclient.jar如果放在自己的WEB-INFO/lib目录下，就是由WebappClassLoader去加载了。所以我们将wlfullclient.jar放到Tomcat安装目录下的lib目录下，这样wlfullclient.jar跟rt.jar就是由同一个classloader加载的了，所以问题就迎刃而解了。

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一个Demo：采集Web应用的Servlet信息

public class MonitorServlets {private static MBeanServerConnection connection;private static JMXConnector connector;private static final ObjectName service;// Initializing the object name for DomainRuntimeServiceMBean// so it can be used throughout the class.static {try {service = new ObjectName("com.bea:Name=DomainRuntimeService,Type=weblogic.management.mbeanservers.domainruntime.DomainRuntimeServiceMBean");} catch (MalformedObjectNameException e) {throw new AssertionError(e.getMessage());}}/** * 测试本地的WebLogic10.3 */public static void main1(String[] args) throws Exception {String hostname = "localhost";String portString = "7001";String username = "weblogic";String password = "weblogic123";MonitorServlets monitor = new MonitorServlets();initConnection(hostname, portString, username, password);monitor.getServletData();connector.close();}/** * 测试192.168.1.5服务器上的WebLogic9.2 */public static void main(String[] args) throws Exception {String hostname = "192.168.1.5";String portString = "7001";String username = "weblogic";String password = "weblogic";MonitorServlets monitor = new MonitorServlets();initConnection(hostname, portString, username, password);monitor.getServletData();connector.close();}/** * Initialize connection to the Domain Runtime MBean Server *  * @param hostname * @param portString * @param username * @param password * @throws IOException * @throws MalformedURLException */public static void initConnection(String hostname, String portString,String username, String password) throws IOException,MalformedURLException {String protocol = "t3";Integer portInteger = Integer.valueOf(portString);int port = portInteger.intValue();String jndiroot = "/jndi/";String mserver = "weblogic.management.mbeanservers.domainruntime";JMXServiceURL serviceURL = new JMXServiceURL(protocol, hostname, port,jndiroot + mserver);Hashtable<String, String> h = new Hashtable<String, String>();h.put(Context.SECURITY_PRINCIPAL, username);h.put(Context.SECURITY_CREDENTIALS, password);h.put(JMXConnectorFactory.PROTOCOL_PROVIDER_PACKAGES,"weblogic.management.remote");connector = JMXConnectorFactory.connect(serviceURL, h);connection = connector.getMBeanServerConnection();}/** * Get an array of ServerRuntimeMBeans *  * @return * @throws Exception */public static ObjectName[] getServerRuntimes() throws Exception {return (ObjectName[]) connection.getAttribute(service, "ServerRuntimes");}/** * Get an array of WebApplicationComponentRuntimeMBeans *  * @throws Exception */public void getServletData() throws Exception {ObjectName[] serverRT = getServerRuntimes();int length = (int) serverRT.length;for (int i = 0; i < length; i++) {System.out.println("===========================================ServerRuntimes");String name = (String) connection.getAttribute(serverRT[i], "Name");String state = (String) connection.getAttribute(serverRT[i],"State");System.out.println("Server name: " + name + ".Server state: "+ state);ObjectName[] appRT = (ObjectName[]) connection.getAttribute(serverRT[i], "ApplicationRuntimes");int appLength = (int) appRT.length;for (int x = 0; x < appLength; x++) {System.out.println("-------------------------------------------ApplicationRuntimes");System.out.println("Application name: "+ (String) connection.getAttribute(appRT[x], "Name"));ObjectName[] compRT = (ObjectName[]) connection.getAttribute(appRT[x], "ComponentRuntimes");int compLength = (int) compRT.length;for (int y = 0; y < compLength; y++) {String componentName = (String) connection.getAttribute(compRT[y], "Name");String componentType = (String) connection.getAttribute(compRT[y], "Type");System.out.println("  Component name: " + componentName+ " , Component type: " + componentType);if (componentType.toString().equals("WebAppComponentRuntime")) {ObjectName[] servletRTs = (ObjectName[]) connection.getAttribute(compRT[y], "Servlets");int servletLength = (int) servletRTs.length;for (int z = 0; z < servletLength; z++) {System.out.println("    Servlet name: "+ (String) connection.getAttribute(servletRTs[z], "Name"));System.out.println("       Servlet context path: "+ (String) connection.getAttribute(servletRTs[z], "ContextPath"));System.out.println("       Invocation Total Count : "+ (Object) connection.getAttribute(servletRTs[z],"InvocationTotalCount"));}}}}}}}