Jakarta Data TCK + GenAI pairing - a journey worth sharing

Hi all,

A few days ago, the OSS program for Claude went live  =
(https://claude.com/contact-sales/claude-for-oss ) and my application =
was approved yesterday, so I started experimenting.

The question I wanted to answer: could I pair with a GenAI to build a =
Jakarta Data 1.0-compatible implementation, integrate it into TomEE, and =
actually pass the Jakarta Data TCK?

I was skeptical about the last part at first. There are reference points =
to draw from: Deltaspike's data repositories, Hibernate's approach, the =
spec Javadoc, and so on but getting all the pieces to fit was another =
matter.

In practice, Claude had solid initial ideas but needed direction at key =
points:=20

- pointing it to specific parts of the TomEE codebase,=20
- telling it to follow the pattern used in a particular CDI extension,=20=

- nudging it to consider edge cases,
- nudging it to built more application composer tests

It was very much a collaborative process rather than a hands-off one and =
took a few hours :)

Before anything gets integrated, I still need to do my homework against =
the ASF GenAI guidance ( =
https://www.apache.org/legal/generative-tooling.html ) and make sure all =
conditions are met (and of course some quality post-processing =E2=80=A6).=


That said, I'm genuinely surprised this worked as well as it did, and I =
thought it was worth sharing with the list.

The code is here: =
https://github.com/rzo1/tomee/tree/jakarta-data/container/openejb-jakarta-=
data=20

Gru=C3=9F
Richard=