How to use VirtualMachine class of com.sun.tools.attach package

Best Powermock code snippet using com.sun.tools.attach.VirtualMachine

Source:MyAgent.java Github

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1package agent;2import com.sachin.agent.transformer.GreetingTransformer;3import com.sun.tools.attach.VirtualMachine;4import java.lang.instrument.Instrumentation;5@SuppressWarnings("AlibabaRemoveCommentedCode")6public class MyAgent {7 /**8 * Java Agent支持目标JVM启动时加载，也支持在目标JVM运行时加载，这两种不同的加载模式会使用不同的入口函数，如果需要在目标JVM启动的同时加载Agent，9 * 那么可以选择实现下面的方法：10 * [1] public static void premain(String agentArgs, Instrumentation inst);11 * [2] public static void premain(String agentArgs);12 *13 *14 *15 *16 * 启动时加载 agent，-javaagent 传入的 jar 包需要在 MANIFEST.MF 中包含 Premain-Class 属性，17 * 此属性的值是 代理类 的名称，并且这个 代理类 要实现 premain 静态方法。18 *19 *20 * Agent 是在 Java 虚拟机启动之时加载的，这个加载处于虚拟机初始化的早期，在这个时间点上：21 * 所有的 Java 类都未被初始化；22 * 所有的对象实例都未被创建；23 * 因而，没有任何 Java 代码被执行；24 *25 *26 * java -javaagent:/Users/jingrzhang/sourceCodes/JavaAgent/first-agent/target/my-agent.jar=abc -jar app-demo-1.0-SNAPSHOT.jar27 *28 */29 public static void premain(String agentArgs, Instrumentation inst) {30 System.out.println("MyAgent#premain");31 System.out.println("args:" + agentArgs + "\n");32 inst.addTransformer(new GreetingTransformer(agentArgs),true);33 }34 /**35 * JDK1.6新增了attach方式，可以对运行中的java进程附加agent，提供了动态修改运行中已经被加载的类的途径。36 * 一般通过VirtualMachine的attach(pid)方法获得VirtualMachine实例，随后可调用loadagent方法将JavaAgent的jar包加载到目标JVM中。37 *38 * 在进程B中向进程A中注入java agent，需要满足以下条件：39 * 进程B的classpath中必须有tools.jar（提供VirtualMachine attach api），jdk默认有tools.jar，jre默认没有。40 *41 * tools.jar 这个包位于jdk的lib目录下， IDEA中安装的java 依赖是 JRE，也就是jdk安装目录下的jre/lib 目录42 *43 * 而这个jre/lib 目录下 没有 jdk目录下的tools.jar44 *45 *而这里用到的VirtualMachine是就是 tools.jar 包中的类。46 * import com.sun.tools.attach.VirtualMachine;47 * import com.sun.tools.attach.VirtualMachineDescriptor;48 *49 * 在jdk1.8中 tools.jar 包中没有了 VirtualMachine， 而是存在50 * sun.tools.attach.HotSpotVirtualMachine51 *52 * com.sun.tools.attach.VirtualMachine53 *54 */55 public static void loadVirtualMachine() throws Exception{56 String jvmPid="targetPid";57// VirtualMachine jvm = VirtualMachine.attach(jvmPid);58// jvm.loadAgent(agentFilePath);//agentFilePath为agent的路径59// jvm.detach();60// logger.info("Attached to target JVM and loaded Java agent successfully");61 //实际返回的是 hotspotVirtualMachine 实现类62 VirtualMachine virtualMachine = VirtualMachine.attach(jvmPid);63 virtualMachine.loadAgent("agentFilePath");64 virtualMachine.detach();65 }66}

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Source:AttachToolMain.java Github

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...56import com.sun.tools.attach.AgentInitializationException;7import com.sun.tools.attach.AgentLoadException;8import com.sun.tools.attach.AttachNotSupportedException;9import com.sun.tools.attach.VirtualMachine;10import com.sun.tools.attach.VirtualMachineDescriptor;1112/**13 * Add tools.jar14 * @author geym15 *16 */17public class AttachToolMain {18 public static void main(String[] args) throws AttachNotSupportedException, IOException, AgentLoadException, AgentInitializationException {19 List<VirtualMachineDescriptor> list = VirtualMachine.list(); 20 for (VirtualMachineDescriptor vmd : list) 21 { 22 if(vmd.displayName().endsWith("RunLoopAccountMain")){ 23 VirtualMachine virtualmachine = VirtualMachine.attach(vmd.id()); 24 virtualmachine.loadAgent("D:\\ja.jar", "argument for agent");25 System.out.println("ok");26 virtualmachine.detach();27 }28 } 29 }30} ...

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VirtualMachine

Using AI Code Generation

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1import com.sun.tools.attach.*;2import java.io.IOException;3import java.util.List;4public class 4 {5 public static void main(String[] args) throws IOException {6 List<VirtualMachineDescriptor> list = VirtualMachine.list();7 for (VirtualMachineDescriptor vmd : list) {8 System.out.println(vmd.id() + " " + vmd.displayName());9 }10 }11}

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VirtualMachine

Using AI Code Generation

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1import com.sun.tools.attach.*;2public class 4 {3 public static void main(String[] args) throws Exception {4 VirtualMachine vm = VirtualMachine.attach("1234");5 vm.loadAgent("myagent.jar");6 vm.detach();7 }8}9import com.sun.tools.attach.*;10import java.io.*;11public class myagent {12 public static void agentmain(String agentArgs, Instrumentation inst) {13 System.out.println("Agent is running");14 }15}

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VirtualMachine

Using AI Code Generation

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1package com.abc.xyz;2import com.sun.tools.attach.VirtualMachine;3import com.sun.tools.attach.VirtualMachineDescriptor;4import java.util.List;5import java.io.IOException;6import java.lang.management.ManagementFactory;7import java.lang.management.RuntimeMXBean;8import java.util.ArrayList;9import java.util.List;10import java.util.Map;11import java.util.Set;12import java.util.logging.Level;13import java.util.logging.Logger;14public class 4 {15 public static void main(String[] args) {16 try {17 List<VirtualMachineDescriptor> vmds = VirtualMachine.list();18 for (VirtualMachineDescriptor vmd : vmds) {19 System.out.println("VMID: " + vmd.id() + " VMNAME: " + vmd.displayName());20 }21 RuntimeMXBean runtimeBean = ManagementFactory.getRuntimeMXBean();22 String jvmName = runtimeBean.getName();23 System.out.println("Current JVM Process ID: " + jvmName);24 int index = jvmName.indexOf('@');25 String pid = jvmName.substring(0, index);26 System.out.println("Current JVM pid: " + pid);27 VirtualMachine vm = VirtualMachine.attach(pid);28 vm.loadAgent("C:\\Users\\Administrator\\Desktop\\agent.jar");29 vm.detach();30 } catch (Exception ex) {31 Logger.getLogger(4.class.getName()).log(Level.SEVERE, null, ex);32 }33 }34}35import java.lang.instrument.Instrumentation;36public class agent {37 public static void premain(String agentArgs, Instrumentation inst) {38 System.out.println("Hello World!");39 }40}

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VirtualMachine

Using AI Code Generation

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1import com.sun.tools.attach.*;2public class 4 {3 public static void main(String args[]) throws Exception{4 VirtualMachine vm = VirtualMachine.attach("pid");5 vm.loadAgent("path/to/agent.jar", "any arguments");6 vm.detach();7 }8}

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VirtualMachine

Using AI Code Generation

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1import com.sun.tools.attach.*;2import java.io.*;3import java.util.*;4import java.util.jar.*;5import java.util.zip.*;6{7public static void main(String args[])8{9VirtualMachine vm = null;10String pid = "";11{12pid = args[0];13vm = VirtualMachine.attach(pid);14System.out.println("Attached to process " + pid);15String agent = vm.getSystemProperties().getProperty("java.home") + File.separator + "lib" + File.separator + "management-agent.jar";16vm.loadAgent(agent);17System.out.println("Agent loaded");18System.out.println("Getting list of loaded classes");19vm.detach();20}21catch (Exception e)22{23e.printStackTrace();24}25}26}

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VirtualMachine

Using AI Code Generation

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1package com.sandbox;2import java.io.IOException;3import java.util.List;4import com.sun.tools.attach.AttachNotSupportedException;5import com.sun.tools.attach.VirtualMachine;6import com.sun.tools.attach.VirtualMachineDescriptor;7public class ListLoadedClassesInRunningJVM {8 public static void main(String[] args) throws AttachNotSupportedException, IOException {9 List<VirtualMachineDescriptor> vms = VirtualMachine.list();10 for (VirtualMachineDescriptor vmd : vms) {11 System.out.println(vmd.displayName());12 }13 VirtualMachine vm = VirtualMachine.attach("12345");14 System.out.println(vm.getSystemProperties());

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VirtualMachine

Using AI Code Generation

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1import java.io.IOException;2import java.util.List;3import com.sun.tools.attach.*;4public class 4 {5 public static void main(String[] args) throws IOException {6 List<VirtualMachineDescriptor> vmds = VirtualMachine.list();7 for (VirtualMachineDescriptor vmd : vmds) {8 System.out.println("Process ID: " + vmd.id());9 System.out.println("Display Name: " + vmd.displayName());10 System.out.println("Virtual Machine Identifier: " + vmd11 .id());12 System.out.println("Virtual Machine Provider: " + vmd13 .provider());14 System.out.println("Virtual Machine Name: " + vmd.name());15 System.out.println();16 }17 }18}

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VirtualMachine

Using AI Code Generation

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1import com.sun.tools.attach.*;2import java.io.*;3import java.util.*;4public class 4 {5 public static void main(String[] args) throws Exception {6 VirtualMachine.list();7 for (VirtualMachineDescriptor vmd : vmds) {8 System.out.println("JVM Id: " + vmd.id());9 System.out.println("JVM Display Name: " + vmd.displayName());10 System.out.println("JVM Provider: " + vmd.provider());11 System.out.println("JVM Version: " + vmd.version());12 System.out.println("JVM Location: " + vmd.location());13 VirtualMachine vm = VirtualMachine.attach(vmd);14 Properties props = vm.getSystemProperties();15 System.out.println("JVM System Properties: " + props);16 vm.detach();17 }18 }19}

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