[hibernate-dev] Adding a Byte Buddy byte code provider to Hibernate

Vlad Mihalcea mihalcea.vlad at gmail.com
Sat Oct 1 11:39:32 EDT 2016

Hi Steve,

Since we have issues with Javassist and Java 1.9, maybe it's the right time
to consider switching to ByteBuddy.


On Sat, Oct 1, 2016 at 6:22 PM, Rafael Winterhalter <rafael.wth at gmail.com>

> Hello everybody,
> I was wondering how big the chances are to get a Byte Buddy bytecode
> provider into Hibernate? Byte Buddy has matured a lot over the last two
> years and it aims a lot on performance what is something Hibernate could
> benefit of. There are comparion charts posted on the Byte Buddy webpage. As
> a bonus, Byte Buddy is already ready for Java 9 and gives a lot of features
> for free, for example generic meta data retention and a possibility to
> retain annotations on subclassed types and overridden methods.
> I have written a simple proof of concept here:
> https://github.com/raphw/hibernate-bb without having tested it - I did not
> implement the fast class providers as I have learned after a lot of
> benchmarking that those do not improve performance on Java 8+ VMs anymore.
> Using such fast-classing rather pollutes the code cache than bring any
> benefit. The only advantage with code generation in this field comes when
> avoiding boxing what is not the case. But of course, I can implement
> something in Byte Buddy to apply such a fast-class mechanism.
> Let me know what you think. I am more then happy to help you with
> implementing such a provider. Other frameworks such as Mockito already use
> Byte Buddy on a large scale and made good experiences with it.
> Best regards, Rafael
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