javaagents

Is it possible to insert a javaagent after virtual machine start from within the same VM? Lets say for example we have an agent in a jar myagent.jar with the appropriate meta data set-up and an agentmain method already implemented. Now the users program calls an API call which should result in the insertion of the agent so that it can redefine the classes. Can it be done and how? https://web.archive.org/web/20141014195801/http://dhruba.name/2010/02/07/creation-dynamic-loading-and-instrumentation-with-javaagents/ has a great example of how to write an agent as well as how to start one on the

I was trying to debug java application using instrumentation. The problem with current system are Hardly written any log statements Poor exception handling This made very difficult to trace root cause of broken functionality. To handle the situation I have developed tool,java agent using Instrumentation API , and I was able to inject log statements and half of the problem solved. But the next problem is to recording the Exception. I want to extend my tool record every exception thrown during the execution of the application. I tried injecting 'try-catch' block using javaassist API for methods

I wish to profile a Java application without stopping the application. Can I add a Javaagent somehow while the application is running? It should be possible according the documentation of the java.lang.instrument package. Starting Agents After VM Startup An implementation may provide a mechanism to start agents sometime after the the VM has started. The details as to how this is initiated are implementation specific but typically the application has already started and its main method has already been invoked. In cases where an implementation supports the starting of agents after the VM has

I'd like to learn something about javaagents, but researching is not easy. Most of result refers to JADE . I know java agent can mean two things: An agent programmed in Java being an incarnation of the agent concept of distributed systems. A low-level software component to augment the working of a JVM, such as profilers, code-coverage tools, etc I've found similar question here , but unfortunately it also refers to version 1. Do you know any articles, tutorials for beginners, sample project about javaagent in version 2? I've found one here, but I'm looking for more. npe The second case talks