Jboss 如何卸载loadAgent（）加载的代理

我正在使用jdk1.6。我已经在运行时成功加载了一个jar。代码如下：

vm = VirtualMachine.attach(vid);
vm.loadAgent(agentPath);

现在我不想在运行时卸载此代理。没有API文档可以这样做。谁能给我一些建议吗？谢谢

编辑

更多代码

GlobalVariables.vm = VirtualMachine.attach(vid);

// Check to see if transformer agent is installed
if(!GlobalVariables.vm.getSystemProperties().contains("demo.agent.installed")) {
    System.out.println("Load agent");

    GlobalVariables.vm.loadAgent(agentPath); 

}

GlobalVariables.connectorAddress = GlobalVariables.vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress", null);
if(null == GlobalVariables.connectorAddress) {
    // It's not, so install the management agent
    String javaHome = GlobalVariables.vm.getSystemProperties().getProperty("java.home");
    File managementAgentJarFile = new File(javaHome + File.separator + "lib" + File.separator + "management-agent.jar");
    GlobalVariables.vm.loadAgent(managementAgentJarFile.getAbsolutePath());
    System.out.println("Load Management agent");
    GlobalVariables.connectorAddress = GlobalVariables.vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress", null);
    // Now it's installed
}

// Now connect and transform the classnames provided in the remaining args.
//JMXConnector connector = null;
try {
    // This is the ObjectName of the MBean registered when loaded.jar was installed.
    //ObjectName on = new ObjectName("transformer:service=DemoTransformer");
    GlobalVariables.on = new ObjectName("transformer:service=DemoTransformer");
    // Here we're connecting to the target JVM through the management agent
    GlobalVariables.connector = JMXConnectorFactory.connect(new JMXServiceURL(GlobalVariables.connectorAddress));
    GlobalVariables.server = GlobalVariables.connector.getMBeanServerConnection();
    System.out.println("MBean Server connection...");

    // Call transformClass on the transformer MBean
    GlobalVariables.server.invoke(GlobalVariables.on, "transformClass", new Object[]{className, args}, new String[]{String.class.getName(), String.class.getName()});

} catch (Exception ex) {
    ex.printStackTrace(System.err);
} finally {
    if(GlobalVariables.connector!=null) try { GlobalVariables.connector.close(); } catch (Exception e) {}
    GlobalVariables.vm.detach();
    System.out.println("Has disconnected");
}

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import com.sun.tools.attach.VirtualMachine;

public class GlobalVariables{
    public static MBeanServerConnection server;
    public static ObjectName on;
    public static JMXConnector connector = null;
    public static String connectorAddress = null;
    public static VirtualMachine vm;
}

我当时做了什么

我再次运行上述代码以再次加载这两个代理。但我有错误

错误

GlobalVariables.vm = VirtualMachine.attach(vid);

// Check to see if transformer agent is installed
if(!GlobalVariables.vm.getSystemProperties().contains("demo.agent.installed")) {
    System.out.println("Load agent");

    GlobalVariables.vm.loadAgent(agentPath); 

}

GlobalVariables.connectorAddress = GlobalVariables.vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress", null);
if(null == GlobalVariables.connectorAddress) {
    // It's not, so install the management agent
    String javaHome = GlobalVariables.vm.getSystemProperties().getProperty("java.home");
    File managementAgentJarFile = new File(javaHome + File.separator + "lib" + File.separator + "management-agent.jar");
    GlobalVariables.vm.loadAgent(managementAgentJarFile.getAbsolutePath());
    System.out.println("Load Management agent");
    GlobalVariables.connectorAddress = GlobalVariables.vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress", null);
    // Now it's installed
}

// Now connect and transform the classnames provided in the remaining args.
//JMXConnector connector = null;
try {
    // This is the ObjectName of the MBean registered when loaded.jar was installed.
    //ObjectName on = new ObjectName("transformer:service=DemoTransformer");
    GlobalVariables.on = new ObjectName("transformer:service=DemoTransformer");
    // Here we're connecting to the target JVM through the management agent
    GlobalVariables.connector = JMXConnectorFactory.connect(new JMXServiceURL(GlobalVariables.connectorAddress));
    GlobalVariables.server = GlobalVariables.connector.getMBeanServerConnection();
    System.out.println("MBean Server connection...");

    // Call transformClass on the transformer MBean
    GlobalVariables.server.invoke(GlobalVariables.on, "transformClass", new Object[]{className, args}, new String[]{String.class.getName(), String.class.getName()});

} catch (Exception ex) {
    ex.printStackTrace(System.err);
} finally {
    if(GlobalVariables.connector!=null) try { GlobalVariables.connector.close(); } catch (Exception e) {}
    GlobalVariables.vm.detach();
    System.out.println("Has disconnected");
}

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import com.sun.tools.attach.VirtualMachine;

public class GlobalVariables{
    public static MBeanServerConnection server;
    public static ObjectName on;
    public static JMXConnector connector = null;
    public static String connectorAddress = null;
    public static VirtualMachine vm;
}

当前虚拟机中出现错误

目标vm中出现错误

目标

做同样的工作没有错误。我想我每次完成工作后都得把探员解雇。但我没能甩掉那些特工

编辑全球变量

GlobalVariables.vm = VirtualMachine.attach(vid);

// Check to see if transformer agent is installed
if(!GlobalVariables.vm.getSystemProperties().contains("demo.agent.installed")) {
    System.out.println("Load agent");

    GlobalVariables.vm.loadAgent(agentPath); 

}

GlobalVariables.connectorAddress = GlobalVariables.vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress", null);
if(null == GlobalVariables.connectorAddress) {
    // It's not, so install the management agent
    String javaHome = GlobalVariables.vm.getSystemProperties().getProperty("java.home");
    File managementAgentJarFile = new File(javaHome + File.separator + "lib" + File.separator + "management-agent.jar");
    GlobalVariables.vm.loadAgent(managementAgentJarFile.getAbsolutePath());
    System.out.println("Load Management agent");
    GlobalVariables.connectorAddress = GlobalVariables.vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress", null);
    // Now it's installed
}

// Now connect and transform the classnames provided in the remaining args.
//JMXConnector connector = null;
try {
    // This is the ObjectName of the MBean registered when loaded.jar was installed.
    //ObjectName on = new ObjectName("transformer:service=DemoTransformer");
    GlobalVariables.on = new ObjectName("transformer:service=DemoTransformer");
    // Here we're connecting to the target JVM through the management agent
    GlobalVariables.connector = JMXConnectorFactory.connect(new JMXServiceURL(GlobalVariables.connectorAddress));
    GlobalVariables.server = GlobalVariables.connector.getMBeanServerConnection();
    System.out.println("MBean Server connection...");

    // Call transformClass on the transformer MBean
    GlobalVariables.server.invoke(GlobalVariables.on, "transformClass", new Object[]{className, args}, new String[]{String.class.getName(), String.class.getName()});

} catch (Exception ex) {
    ex.printStackTrace(System.err);
} finally {
    if(GlobalVariables.connector!=null) try { GlobalVariables.connector.close(); } catch (Exception e) {}
    GlobalVariables.vm.detach();
    System.out.println("Has disconnected");
}

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import com.sun.tools.attach.VirtualMachine;

public class GlobalVariables{
    public static MBeanServerConnection server;
    public static ObjectName on;
    public static JMXConnector connector = null;
    public static String connectorAddress = null;
    public static VirtualMachine vm;
}

你说卸下代理是什么意思？您不能卸载文档中隐含的类：

指定的JAR文件将添加到 目标虚拟机）

解决这个问题的唯一方法可能是一些自定义类装入器魔法，但我不建议这样做

更新：在看了你的扩展问题后，我认为你的问题实际上是其他问题。在某个时刻，您正在调用

JMXConnectorFactory.connect(new JMXServiceURL(GlobalVariables.connectorAddress))

为了创建一个。我猜在您的

GlobalVariables.server.invoke

调用中，您正在通过

newobjectname（“transformer:service=DemoTransformer”）

注册MBean。此名称必须是唯一的，并且当您第二次运行代码时，此名称已按照

javax.management.InstancealReadyExistException:transformer:service=DemoTransformer

的建议使用。您需要做的是：

• 或者在第二次注册MBean时选择另一个名称
• 在从远程JVM分离之前，调用

  MBeanServerConnection.close（新对象名（“transformer:service=DemoTransformer”）

  ，以使名称再次可用

您可能已经假定，通过分离，远程计算机上的所有状态都已重置。但事实并非如此。您添加了一个名为的MBean，然后再次尝试这样做。可以将此错误理解为向映射添加了具有相同键的两个值。但是，除了使用贴图之外，您不会覆盖值，而是会导致上面观察到的异常

顺便说一下：当不再需要连接到远程服务器时，应该显式地调用

JMXConnector.close

附言：你可能会觉得有趣

更新2：在聊天中进行讨论并排除MBean命名冲突后，我认为这就是问题的原因：

第二次加载Java代理时，代理附带的类（在

managementAgentJarFile

中表示）已加载到目标JVM中。这意味着，不会再次运行任何类初始值设定项，并且仍然会表示由

静态

变量表示的状态更改。此外，不可能加载具有相同名称但更改了实现的类。这将导致

LinkageError

s，并且代理加载将失败。解决方案是避免

静态

状态，使代理无法对自身造成影响，并为不同的代理创建单独的名称空间。否则，可以使用自定义类装入器卸载代理类。有关这一问题的更多信息，可在许多地方和此处找到：

---

是否

移除仪器

意味着

卸载代理

？我已经在raphw编辑了我的问题。你能帮我提些建议吗？感谢

GlobalVariables

虚拟机的超级类型是什么？这甚至不应该编译。一个包含一些静态变量的类。我已将代码添加到问题描述中@我想我知道你的问题是什么了。您注册了两个同名的MBean。请看我上面编辑的答案。我想你代码的第一行漏掉了一个点

GlobalVariables.vm=VirtualMachine.attach（vid）在此处复制我的代码时，它将丢失。这是我计划的一部分。