如何完成这种仪器

Question

I have different Java applications running on my system and want to instrument classes from one of these applications

While trying to do this using dynamically loaded Java agent I found that we can attach it to a jvm instance which requires vm id of that jvm instance when I put a pid of an already running Java application by searching from windows task manager the agent jar does not attach to this process and a error is thrown.

While doing it using ManagementFactory.getRuntimeMXBean() the process id() returned is that of the instance loading the agent.jar . kindly suggest how to access a vmid of a different jvm instance

Answer 1

You can use scripts for executing the JPS command and extract the information regarding the VM instances being run.

Also the jps command uses MonitoredHost API which has activeVms() method.