asmhatreandClaude Sonnet 5.5
453fad0ee7
Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b7jUQrypvpE1ix1k7V
48 lines
2.0 KiB
Markdown
48 lines
2.0 KiB
Markdown
# Hibernate 8 + Jakarta Persistence 4: EntityAgent demo
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Runnable companion to the ankurm.com article on `EntityAgent` and stateless sessions.
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Every number in the article comes from a file in [`output/`](output), and each of those files is
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written by a test that asserts the same numbers, so a figure that stops being true fails the build.
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## Versions tested
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| Component | Version |
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|---|---|
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| Hibernate ORM | 8.0.0.CR1 (release candidate, 12 Nov 2026) |
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| Jakarta Persistence API | 4.0.0-M8 (milestone, resolved transitively by CR1) |
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| JDK | Temurin 25.0.5+8 |
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| H2 | 2.5.252 |
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| HSQLDB (test scope, comparison runs) | 2.7.4 |
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| JUnit | 6.1.3 |
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| Maven | 3.9.11 |
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Hibernate 8 and Jakarta Persistence 4 are pre-release. Assertions in `Demo05Test` and `Demo09Test`
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are deliberately pinned to CR1 behaviour, so they fail when a later build changes it.
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## Run it
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./scripts/run-all.sh
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## Layout
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| Path | What it shows |
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| `src/main/java/com/ankurm/agent/` | `Book`, `Publisher`, `Setting` entities and the `BookSummary` record |
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| `src/test/java/com/ankurm/agent/Lab.java` | boots a SessionFactory and records every prepared SQL statement |
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| `Demo01Test` | same edit through `EntityManager` and `EntityAgent` |
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| `Demo02Test` | `get()` vs `find()`, no first-level cache, `getMultiple()` |
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| `Demo03Test` | lazy associations and `fetch()` |
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| `Demo04Test` | bulk insert: persistence-context size and statements prepared |
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| `Demo05Test` | lock modes on a stateless handler, H2 and HSQLDB |
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| `Demo06Test` | `@ExcludedFromVersioning` |
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| `Demo07Test` | programmatic result set mappings |
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| `Demo08Test` | `upsert()`, `delete()`, duplicate-key exception |
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| `Demo09Test` | the same operations on H2 and HSQLDB |
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## Captured output
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`output/01-entitymanager-vs-entityagent.txt`, `02-get-find-and-no-cache`,
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`03-lazy-associations-and-fetch`, `04-bulk-insert`, `05-lock-modes-in-entityagent`,
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`06-excluded-from-versioning`, `07-programmatic-result-set-mapping`,
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`08-upsert-delete-and-errors`, `09-same-operations-two-databases`.
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