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java-helidon

Get best practices for developing applications with Helidon 4 (SE and MP). Use when working with Helidon SE or Helidon MP, HttpService routing, Helidon DB Client, MicroProfile Config, Helidon Security, or Helidon testing in Java 21+ projects.

skills/java-helidon/SKILL.md

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# Helidon Best Practices

Your goal is to help me write high-quality Helidon applications by following established best practices.

## Helidon 3 → 4 API changes

Helidon 4 renamed or resignatured APIs that appear widely in their Helidon 3 form.
The left column does not compile on Helidon 4. Check generated code against this table
before returning it.

| Do not use (Helidon 3)                                     | Use (Helidon 4)                                                    |
| ---------------------------------------------------------- | ------------------------------------------------------------------ |
| `io.helidon.common.http.Http.Status`                       | `io.helidon.http.Status`                                           |
| `io.helidon.webserver.Service`                             | `io.helidon.webserver.http.HttpService`                            |