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

Claude is pretty incredible.  I'm excited about our future.


-David


> On Mar 5, 2026, at 6:30=E2=80=AFAM, Richard Zowalla <[email protected]> =
wrote:
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> Hi all,
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> 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.
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> 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?
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> 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.
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> In practice, Claude had solid initial ideas but needed direction at =
key points:=20
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> - 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
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> It was very much a collaborative process rather than a hands-off one =
and took a few hours :)
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> 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).=

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> That said, I'm genuinely surprised this worked as well as it did, and =
I thought it was worth sharing with the list.
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> The code is here: =
https://github.com/rzo1/tomee/tree/jakarta-data/container/openejb-jakarta-=
data=20
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> Gru=C3=9F
> Richard