jamesfredley commented on PR #15677:
URL: https://github.com/apache/grails-core/pull/15677#issuecomment-4568577801
## Forge behavior: the `grails-micronaut` feature and Java versions
Documenting the current Forge behavior (asked about earlier - it was already
in place on this branch, committed in `5f94d86f79`).
### What happens
When the `grails-micronaut` feature is selected in Grails Forge (CLI, web
UI, or API) and the requested target JDK is **below 25**, app generation is
**rejected** - no project is produced. The feature's `processSelectedFeatures`
hook throws:
```
grails-micronaut requires JDK 25 or later (selected: JDK <NN>).
```
Selecting the feature with JDK 25+ generates the app normally.
### Where it is enforced
`org.grails.forge.feature.micronaut.GrailsMicronaut#processSelectedFeatures`:
```java
JdkVersion jdk = featureContext.getJavaVersion();
if (jdk.majorVersion() < JdkVersion.JDK_25.majorVersion()) {
throw new IllegalArgumentException(
getName() + " requires JDK 25 or later (selected: JDK " +
jdk.majorVersion() + ").");
}
```
### Why JDK 25
`micronaut-core`'s `ScopedValues` references
`java.lang.ScopedValue.CallableOp`, which only exists on JDK 25+ (JEP 506).
More broadly, the Micronaut 5.0.0 GA platform bumped in this PR publishes JARs
with `org.gradle.jvm.version=25` and JVM 25 bytecode. This is the same
constraint that drives the consumer-side note in the PR description: the
published `grails-micronaut:8.0.0` artifact carries
`org.gradle.jvm.version=25`, so Grails 8 apps on JDK 21 cannot resolve it.
Forge fails fast at generation time rather than letting users discover the
incompatibility at build time.
### Related Forge validation
`GrailsMicronautValidator#validatePreProcessing` additionally rejects
combining `grails-micronaut` with Spring Boot DevTools (see
micronaut-projects/micronaut-spring#769):
```
Spring Boot DevTools are not supported with Grails Micronaut
```
### Note on test coverage
The JDK 25 guard itself currently has no dedicated negative test - existing
specs that exercise `grails-micronaut` simply supply `JdkVersion.JDK_25` so
they pass. If desired, I can add a Forge spec asserting that selecting
`grails-micronaut` with a sub-25 JDK throws the expected
`IllegalArgumentException`. Let me know and I'll include it.
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