StaticContentService Not Working with Java Modules

[crgardner]

Environment Details

• Helidon Version: 4.0.5
• Helidon SE
• JDK version: openjdk version "21.0.2" 2024-01-16 LTS
• OS: Fedora 37
• Docker version (if applicable): NA

---

Problem Description

Generated starter project with static content and Java modules returns 404 NOT FOUND for when requesting the static content. If I remove the module-info.java, making the application non-explcitly modular, Helidon finds the static content and returns it.

The following code was generated from the Helidon starter. The onlyh thin different is I removed the "/" redirect to "/ui" to see if that made any difference (it didn't):

  static void routing(HttpRouting.Builder routing) {
        routing
               .register("/greet", new GreetService())
               .get("/simple-greet", (req, res) -> res.send("Hello World!"))

                .register("/ui", StaticContentService.builder("WEB")
                        .welcomeFileName("index.html")
                        .build())
                .register("/api", new FileService());
    }

This problem happens consistently with module-info.java. With no module-info.java, index.html is returned consistently.

Does StaticContentService need to be updated to find files differently than the classpath and file system when modules are used?

Steps to reproduce

1. Generate a starter project with static content (the file upload example)
2. Start the application.
3. Navigate to the root or /ui URL.
4. Receive 404.

[romain-grecourt]

Add this to your module-info:

opens WEB;

This is a bug in the archetype, the module-info generated should be functional.

[wojtask9]

Also this info "should" be also in documentation. When you use "jpms" with "StaticContent" not all paths are available like in classic classpath.

Took some time to debug this issue :)