Re: Jakarta Data TCK + GenAI pairing - a journey worth sharing

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Anthropic Claude is insanely good. Glad to see you had a great experience
with it!

On Thu, Mar 5, 2026 at 7:30=E2=80=AFAM Richard Zowalla <[email protected]> wr=
ote:

> 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:
>
> - pointing it to specific parts of the TomEE codebase,
> - telling it to follow the pattern used in a particular CDI extension,
> - 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
>
> Gru=C3=9F
> Richard



--=20
Jonathan | [email protected]
Pessimists, see a jar as half empty. Optimists, in contrast, see it as half
full.
Engineers, of course, understand the glass is twice as big as it needs to
be.

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