运行时设置JMX的JVM参数

时间:2016-03-29 14:27:49

标签: java jvm jmx jvm-arguments

我有一些代码连接到JMX并按名称获取mBean。现在我正在用JUnit编写测试。我已经做了一些测试而没有使用类似的东西进行身份验证:

private static void startJmxServer() throws Exception {
  MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();

  LocateRegistry.createRegistry(PORT);

  JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://" + HOST + ':' + PORT + "/jmxrmi");
  JMXConnectorServer connectorServer = JMXConnectorServerFactory.newJMXConnectorServer(url, null, mbs);

  Example exampleMBean = new Example();
  ObjectName exampleName = new ObjectName(MBEAN_NAME);

  mbs.registerMBean(exampleMBean, exampleName);

  connectorServer.start();
} 

现在我想用身份验证做一些测试。所以我需要指定下一个JVM特性:

-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=1234
-Dcom.sun.management.jmxremote.authenticate=true
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.access.file=/somepath/jmxremote.access
-Dcom.sun.management.jmxremote.password.file=/somepath/jmxremote.password

我已经尝试在JMXConnectorServer环境变量中传递此属性。我也试过System.setProperty。但是失败了,因为没有任何凭证就可以连接。 使其有效的唯一方法是:

private static void startJmxServer() throws Exception {
    String name = ManagementFactory.getRuntimeMXBean().getName();
    VirtualMachine vm = VirtualMachine.attach(name.substring(0, name.indexOf('@')));

    String lca = vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress");

    if (lca == null) {
        Path p = Paths.get(System.getProperty("java.home")).normalize();

        if (!"jre".equals(p.getName(p.getNameCount() - 1).toString()
            .toLowerCase())) {
            p = p.resolve("jre");
        }

        File f = p.resolve("lib").resolve("management-agent.jar").toFile();

        if (!f.exists()) {
            throw new IOException("Management agent not found");
        }

        String options = String.format("com.sun.management.jmxremote.port=%d, " +
            "com.sun.management.jmxremote.authenticate=true, " +
            "com.sun.management.jmxremote.ssl=false, " +
            "com.sun.management.jmxremote.access.file=/somepath/jmxremote.access, " +
            "com.sun.management.jmxremote.password.file=/somepath/jmxremote.password", PORT);
        vm.loadAgent(f.getCanonicalPath(), options);
    }

    vm.detach();

    MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();

    Example exampleMBean = new Example();

    ObjectName exampleName = new ObjectName(MBEAN_NAME);
    mbs.registerMBean(exampleMBean, exampleName);
}

但是当代理被加载时,我无法更改VM属性以在没有身份验证的情况下运行测试。我也想避免这样的事情,因为需要手动定义tools.jar并且想要使用常见的JMX工具。知道如何管理这个吗?

1 个答案:

答案 0 :(得分:2)

身份验证配置在environment中传递 - 第二个参数传递给JMXConnectorServerFactory.newJMXConnectorServer

    HashMap<String, Object> env = new HashMap<>();
    env.put("jmx.remote.x.password.file", "/somepath/jmxremote.password");
    env.put("jmx.remote.x.access.file", "/somepath/jmxremote.access");

    JMXConnectorServer connectorServer =
        JMXConnectorServerFactory.newJMXConnectorServer(url, env, mbs);

请注意,此处的属性名称与属性名称不同。

从JDK源中查阅ConnectorBootstrap.java,了解默认JMXConnectorServer的初始化方式。