javaagentSample

javaagent的示例程序.

代码说明

maintest

被植入代码的目标程序,
通过向这个程序中的helloWorld方法中植入代码改变这个函数的行为

originalagent

javaagent的客户端, 具体要插入的逻辑

attachagent

通过这个程序，可以讲agent attach到任何一个正在运行的jvm pid上.

用法

  mvn package
  [INFO] javaagent-demo 1.0-SNAPSHOT ........................ SUCCESS [  0.005 s]
  [INFO] jvm-sandbox-javaagent .............................. SUCCESS [  0.906 s]
  [INFO] original-agent ..................................... SUCCESS [  1.347 s]
  [INFO] main-test .......................................... SUCCESS [  0.084 s]
  [INFO] attach-agent 1.0-SNAPSHOT .......................... SUCCESS [  0.556 s]

permain的加载方式

  java -javaagent:originalagent/target/original-agent-jar-with-dependencies.jar=args1 -jar maintest/target/main-test-1.0-SNAPSHOT-jar-with-dependencies.jar

attach的加载方式

先把test jar启动起来.

    java -jar maintest/target/main-test-1.0-SNAPSHOT-jar-with-dependencies.jar

找到进程号, 然后attach上去

      java -jar -Xbootclasspath/a:/Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home/lib/tools.jar attach-agent-1.0-SNAPSHOT-jar-with-dependencies.jar 28971