I agree that ByteBuddy is a great well supported library. However, it does not covered all PowerMock needs, at least for now. It’s well applied when you need advice your code or generate a code. However, to support such features as constructor stubbing, mocking constructor calls or mocking System class I have to modify byte code in instruction level where ByteBuddy features ends. I have only one option - use ASM in addition to ByteBuddy. At it means that I have to: - go deep into JVM implantation. - manually track stack, local variables and so on (with a help from ByteBuddy side, however there are still a lot of work to do) - care about JVM changes and aspect of implementation As result it takes a lot of time to implement the features that already worked with Javassist. I tried to implement it for 6 months, however, with a time that I can give to PowerMock I did not achieve a big progress. Task is too complicate. You need fully focus on it - what hardly achievable when you work for 30-60 minutes per day. I’m not going to stop working at all on migrating to ByteBuddy. I just changed priorities to be able to release what was already implemented year ago. Best Regards, Artur Zagretdinov On 28 Oct 2018, at 05:17, Ismael Juma <notifications@github.com<mailto:notifications@github.com>> wrote: @thekingnothing<https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fthekingnothing&data=02%7C01%7C%7C81d5f917001e44ea24d408d63c9495e8%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636763006193257986&sdata=MdVFvfWooHbuDOm8o%2BTjXYANwH2V0up9iqbRHq%2BvQnE%3D&reserved=0> Out of curiosity, why did you remove the code using ByteBuddy? It's seemingly the bytecode generation library with best support at this point. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fpowermock%2Fpowermock%2Fpull%2F948%23issuecomment-433677310&data=02%7C01%7C%7C81d5f917001e44ea24d408d63c9495e8%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636763006193257986&sdata=C66itYssCvo7NsbhQhPYGt2HCAgHDou5DtJqJtk1Pik%3D&reserved=0>, or mute the thread<https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAMkKAJQW1jnlyQK2tdUqDUuzNtODVTrGks5upT3JgaJpZM4X4pQ4&data=02%7C01%7C%7C81d5f917001e44ea24d408d63c9495e8%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636763006193257986&sdata=qsVTCq8Gr2sdrjUHPdU%2Fu69a0KLRCwNr8QPrR5gChug%3D&reserved=0>.