On Sat, Nov 5, 2022 at 4:00 PM Clebert Suconic <clebert.suco...@gmail.com> wrote:
> There are of course tools that would been written before. I have not > seen anything that would be as simple as I'm proposing (with the > exception of the .NET where you can get a list of objects). > Yes! It is weird that C#, Python, JavaScript, all have a simple way to list heap objects, only in Java it seems soo hard to do. > What I'm doing is based on the JBoss Profiler that I wrote many years > ago (and I left it rotten and dead)... so this would revive the simple > parts just for the JUnit Tests. > Yeah, I linked it in my previous mail. I was thinking that the code looks somewhat similar, except it's in C and not C++... > You just get a simple list of Objects before and later. > > > Regarding the criticism to JMVTI.. I have it already written, besides > any tooling around Java and Debugging will require C dev... > > > the project itself already exists.. and I think it's viable. I am > looking for options to host it, while you seem to be looking for > counter arguments for having it done? > I'm just writing up the results of my explorations. Initially I hoped to learn what is possible. Best case would be I found something that's already written and hosted, and that does not include native code (think all those possible build/compatibility issues).... that did not really happen... Some tests can be written using the weakref approach, but that has limited use for only specific scenarios. The dumping and reading of hprof file might work, but I did not find a good Java implementation (Shark is in Kotlin). The jetbrains JVMTI library looks reasonable, on a first sight, though. > if you give me an alternative in Java where i can do > jvmti.getallObject(clazz); and eventually list the references for it.. > perhaps I could just use that option instead. Such thing will be > written in C anyways. > https://github.com/JetBrains/debugger-memory-agent MemoryAgent ma = MemoryAgent.get(); if (ma == null) { /* handle failure to load */ } ma.getAllReachableObjects(null, clazz); -- Mit freundlichen Grüßen / Kind regards Jiri Daněk
