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);
现在我想在运行时卸载这个代理。没有 API DOC 可以做到这一点。谁能给我一些建议?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");
}
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
当前虚拟机中的错误
com.sun.tools.attach.AgentInitializationException: Agent JAR loaded but agent failed to initialize
at sun.tools.attach.HotSpotVirtualMachine.loadAgent(HotSpotVirtualMachine.java:103)
at com.sun.tools.attach.VirtualMachine.loadAgent(VirtualMachine.java:508)
at faultinjectionaction.AttachClass.attachAgent(AttachClass.java:111)
at org.apache.jsp.fjstep3_jsp._jspService(fjstep3_jsp.java:350)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
目标虚拟机错误
Exception in thread "Attach Listener" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:323)
at sun.instrument.InstrumentationImpl.loadClassAndCallAgentmain(InstrumentationImpl.java:348)
Caused by: javax.management.InstanceAlreadyExistsException: transformer:service= DemoTransformer
at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312)
at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:482)
at faultinjectionagent.AgentMain.agentmain(AgentMain.java:28)
... 6 more
目标
做同样的工作没有错误。我想我每次完成工作后都需要卸下代理。但是我没有卸载那些代理。
编辑 GlobleVariables
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;
}