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Performance degradations in H2 2.4 #2664

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Performance degradations in H2 `2.4`
MattSchur Jun 24, 2026
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Update java/developing-applications/testing.md
MattSchur Jun 24, 2026
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Merge branch 'main' into h2-2.4-warning
agoerler Jun 24, 2026
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4 changes: 4 additions & 0 deletions java/developing-applications/testing.md
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Expand Up @@ -267,6 +267,10 @@ Check out the version in our [CAP Java bookshop sample project](https://github.c

H2 includes a built-in web console application, providing a user-friendly interface for database administration, query execution, and data inspection without requiring external tools. CAP Java applications configured with the H2 database expose the administration console under `http://localhost:8080/h2-console` (assuming default port `8080`).

::: warning Use the latest `2.3.x` version of H2
Avoid using the version `2.4.240` of H2. It has a bug causing performance degradations in certain subqueries, which are used by cascade delete.
:::
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@renejeglinsky renejeglinsky Jun 24, 2026

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When would we delete this note? When the bug is fixed? Or are they not planning on doing so?

@agoerler agoerler Jun 24, 2026

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When a release with a bugfix is available.

I am a bot uneasy wether we can (legally) highlight this bug. Alternatively we could phrase a positive message and state that the max supported minor version is 2.3.x.

@renejeglinsky renejeglinsky Jun 25, 2026

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Is there a public bug report? Or did we just identify that during testing?
I agree to a positive formulation, but if that is a publicly known bug, I don't see an issue mentioning that.

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::: warning Use the latest `2.3.x` version of H2
Avoid using the version `2.4.240` of H2. It has a bug causing performance degradations in certain subqueries, which are used by cascade delete.
:::
::: warning Use the latest `2.3.x` version of H2
Even though there are newer versions available, we cannot recommend using them for now. Therefore we only support until version 2.3.x of H2. This recommendation is subject to change. If our test results allow to recommend newer versions we will do so.
:::

@MattSchur MattSchur Jun 25, 2026

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There is one that looks related: h2database/h2database#4353


### Setup & Configuration

#### Using the Maven Archetype
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