Examples of com.sun.tools.attach.VirtualMachine

com.sun.tools.attach.VirtualMachine
ch to target VM VirtualMachine vm = VirtualMachine.attach("2177");
// get system properties in target VM Properties props = vm.getSystemProperties();
// construct path to management agent String home = props.getProperty("java.home"); String agent = home + File.separator + "lib" + File.separator + "management-agent.jar";
// load agent into target VM vm.loadAgent(agent, "com.sun.management.jmxremote.port=5000");
// detach vm.detach();

In this example we attach to a Java virtual machine that is identified by the process identifier 2177. The system properties from the target VM are then used to construct the path to a management agent which is then loaded into the target VM. Once loaded the client detaches from the target VM.

A VirtualMachine is safe for use by multiple concurrent threads.
@since 1.6

            // privileges.
            boolean attachable = false;
            String address = null;
            String name = String.valueOf(vmid); // default display name to pid
            try {
                VirtualMachine vm = VirtualMachine.attach(name);
                attachable = true;
                Properties agentProps = vm.getAgentProperties();
                address = (String) agentProps.get(LOCAL_CONNECTOR_ADDRESS_PROP);
                vm.detach();
                lvm = new LocalVirtualMachine(vmid, name, attachable, address);
            } catch (AttachNotSupportedException x) {
                // not attachable
                x.printStackTrace();
            } catch (IOException x) {

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        return lvm;
    }


    // load the management agent into the target VM
    private void loadManagementAgent() throws IOException {
        VirtualMachine vm = null;
        String name = String.valueOf(vmid);
        try {
            vm = VirtualMachine.attach(name);
        } catch (AttachNotSupportedException x) {
            IOException ioe = new IOException(x.getMessage());
            ioe.initCause(x);
            throw ioe;
        }


        String home = vm.getSystemProperties().getProperty("java.home");


        // Normally in ${java.home}/jre/lib/management-agent.jar but might
        // be in ${java.home}/lib in build environments.


        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 IOException("Management agent not found");
            }
        }


        agent = f.getCanonicalPath();
        try {
            vm.loadAgent(agent, "com.sun.management.jmxremote");
        } catch (AgentLoadException x) {
            IOException ioe = new IOException(x.getMessage());
            ioe.initCause(x);
            throw ioe;
        } catch (AgentInitializationException x) {
            IOException ioe = new IOException(x.getMessage());
            ioe.initCause(x);
            throw ioe;
        }


        // get the connector address
        Properties agentProps = vm.getAgentProperties();
        address = (String) agentProps.get(LOCAL_CONNECTOR_ADDRESS_PROP);


        vm.detach();
    }

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         @Override
         public JMXConnector getConnector() {
            String pid = getJavaPIDs();
            if (pid == null) return null;
            try {
               VirtualMachine vm;
               try {
                  vm = VirtualMachine.attach(pid);
               } catch (AttachNotSupportedException e) {
                  log.error("Cannot attach to machine " + pid, e);
                  return null;
               }
               String connectorAddress = vm.getAgentProperties().getProperty(CONNECTOR_ADDRESS);
               if (connectorAddress == null) {
                  String agent = vm.getSystemProperties().getProperty("java.home") +
                        File.separator + "lib" + File.separator +
                        "management-agent.jar";
                  try {
                     vm.loadAgent(agent);
                     connectorAddress = vm.getAgentProperties().getProperty(CONNECTOR_ADDRESS);
                  } catch (Exception e) {
                     log.error("Cannot load management agent into target VM.");
                  }
               }
               if (connectorAddress == null) {

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            if (config.verbose) {
                System.out.println("Attaching to process " + config.pidOfProcessToAttachTo +
                        " and launching jHiccup agent from jar " + config.pidOfProcessToAttachTo +
                        " with args: " + config.agentArgs );
            }
            VirtualMachine vm = VirtualMachine.attach(config.pidOfProcessToAttachTo);
            vm.loadAgent(config.agentJarFileName, config.agentArgs);
            vm.detach();
            System.exit(0);
        } catch (IOException ex) {
            System.out.println(ex);
            System.exit(1);
        } catch (AttachNotSupportedException ex) {

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        } else {
            classLoaderId = args[4];
        }
        
        TRC.fine("Attaching to pid: " + pid);
        final VirtualMachine vm = VirtualMachine.attach(pid);
        
        int port = getFreePort(LOCALHOST);
        // start the agent, which will create the server socket, then return
        String agentArgs = String.valueOf(port) + "\n" + clojurepath + "\n" + serverpath + "\n" + classLoaderId;
        vm.loadAgent(agentpath, agentArgs);


        boolean listClassLoaders = "L".equals(classLoaderId);
        // start the code that will connect to the server socket
        Console.main(LOCALHOST, port, !listClassLoaders);


        // the server will shutdown when the client disconnects
        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                try {
                    vm.detach();
                } catch (RuntimeException e) {
                    throw e;
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }

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                Integer vmid = Integer.valueOf(vmd.id());
                if (!map.containsKey(vmid)) {
                    boolean attachable = false;
                    String address = null;
                    try {
                        VirtualMachine vm = VirtualMachine.attach(vmd);
                        attachable = true;
                        Properties agentProps = vm.getAgentProperties();
                        address = (String) agentProps.get(LOCAL_CONNECTOR_ADDRESS_PROP);
                        vm.detach();
                    } catch (AttachNotSupportedException x) {
                        // not attachable
                    } catch (IOException x) {
                        // ignore
                    }

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            // privileges.
            boolean attachable = false;
            String address = null;
            String name = String.valueOf(vmid); // default display name to pid
            try {
                VirtualMachine vm = VirtualMachine.attach(name);
                attachable = true;
                Properties agentProps = vm.getAgentProperties();
                address = (String) agentProps.get(LOCAL_CONNECTOR_ADDRESS_PROP);
                vm.detach();
                lvm = new LocalVirtualMachine(vmid, name, attachable, address);
            } catch (AttachNotSupportedException x) {
                // not attachable
                if (JConsole.isDebug()) {
                    x.printStackTrace();

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        return lvm;
    }


    // load the management agent into the target VM
    private void loadManagementAgent() throws IOException {
        VirtualMachine vm = null;
        String name = String.valueOf(vmid);
        try {
            vm = VirtualMachine.attach(name);
        } catch (AttachNotSupportedException x) {
            IOException ioe = new IOException(x.getMessage());
            ioe.initCause(x);
            throw ioe;
        }


        String home = vm.getSystemProperties().getProperty("java.home");


        // Normally in ${java.home}/jre/lib/management-agent.jar but might
        // be in ${java.home}/lib in build environments.


        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 IOException("Management agent not found");
            }
        }


        agent = f.getCanonicalPath();
        try {
            vm.loadAgent(agent, "com.sun.management.jmxremote");
        } catch (AgentLoadException x) {
            IOException ioe = new IOException(x.getMessage());
            ioe.initCause(x);
            throw ioe;
        } catch (AgentInitializationException x) {
            IOException ioe = new IOException(x.getMessage());
            ioe.initCause(x);
            throw ioe;
        }


        // get the connector address
        Properties agentProps = vm.getAgentProperties();
        address = (String) agentProps.get(LOCAL_CONNECTOR_ADDRESS_PROP);


        vm.detach();
    }

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    }


    private static final String LIVE_OBJECTS_OPTION = "-live";
    private static final String ALL_OBJECTS_OPTION = "-all";
    private static void histo(String pid, boolean live) throws IOException {
        VirtualMachine vm = attach(pid);
        InputStream in = ((HotSpotVirtualMachine)vm).
            heapHisto(live ? LIVE_OBJECTS_OPTION : ALL_OBJECTS_OPTION);
        drain(vm, in);
    }

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        filename = new File(filename).getCanonicalPath();


        // dump live objects only or not
        boolean live = isDumpLiveObjects(options);


        VirtualMachine vm = attach(pid);
        System.out.println("Dumping heap to " + filename + " ...");
        InputStream in = ((HotSpotVirtualMachine)vm).
            dumpHeap((Object)filename,
                     (live ? LIVE_OBJECTS_OPTION : ALL_OBJECTS_OPTION));
        drain(vm, in);

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