如何通过了解进程ID连接到本地JMX服务器？

Question

这背后的动机是使用JMX管理本地java服务,而不像java服务Wrapper那样更重量级.

启动每个服务,-Dcom.sun.management.jmxremote这意味着"JVM配置为作为本地(仅限同一台计算机)的JMX服务器." (见这里有一个很好的解释).

我尝试了Attach API,但决定反对它,因为它没有与Java SE6捆绑在一起,并且无法将其与maven集成.

Answer 1

我正在发布问题以分享解决方案,因为我在这里没有看到它(问答).这里的关键是ConnectorAddressLink.importFrom(pid)用来获取地址.

public static MBeanServerConnection getLocalMBeanServerConnectionStatic(int pid) {
    try {
        String address = ConnectorAddressLink.importFrom(pid);
        JMXServiceURL jmxUrl = new JMXServiceURL(address);
        return JMXConnectorFactory.connect(jmxUrl).getMBeanServerConnection();
    } catch (IOException e) {
        throw new RuntimeException("Of course you still have to implement a good connection handling");
    }
}

Answer 2

@蒂姆·布特

如果ConnectorAddressLink.importFrom返回 null，请尝试将 management-agent.jar 加载到 VM 中。

例如startManagementAgent来自https://github.com/openjdk-mirror/jdk7u-jdk/blob/master/test/sun/management/jmxremote/bootstrap/TestManager.java 的类似函数

private static void startManagementAgent(String pid) throws IOException {
    /*
     * JAR file normally in ${java.home}/jre/lib but may be in ${java.home}/lib
     * with development/non-images builds
     */
    String home = System.getProperty("java.home");
    String agent = home + File.separator + "jre" + File.separator + "lib"
            + File.separator + "management-agent.jar";
    File f = new File(agent);
    if (!f.exists()) {
        agent = home + File.separator + "lib" + File.separator +
            "management-agent.jar";
        f = new File(agent);
        if (!f.exists()) {
            throw new RuntimeException("management-agent.jar missing");
        }
    }
    agent = f.getCanonicalPath();

    System.out.println("Loading " + agent + " into target VM ...");

    try {
        VirtualMachine.attach(pid).loadAgent(agent);
    } catch (Exception x) {
        throw new IOException(x.getMessage());
    }
}