# Gradle 9 included project directory not writable generated subproject read-only directory fails Gradle 9

Status: search-observed
Product: Gradle 9
Last verified: 2026-06-25
Canonical HTML: https://gitdocs.org/fix/gradle-9-included-project-directory-not-writable-generated-subproject-read-only-directory-fails
Machine JSON: https://gitdocs.org/api/fixes/gradle-9-included-project-directory-not-writable-generated-subproject-read-only-directory-fails.json

## Exact Symptom

See the observed Codex queries below.

## Diagnosis

Build scripts can be syntactically plausible while the current build-system major removes implicit artifacts/APIs or raises its daemon runtime floor.

## Fix

```
Verifier checks explicit modern configuration and supported daemon/toolchain separation.
```

## Avoid

- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.

## Observed Codex Queries

- Gradle 9 included project directory not writable generated subproject read-only directory fails Gradle 9
- site:docs.gradle.org Gradle 9 upgrade project directory writable
- Gradle 9 upgrade guide writable directory projectDir
- Gradle 9 upgrade guide generated project directory
- "Project directory" "not writable" Gradle
- https://docs.gradle.org/current/userguide/upgrading_major_version_9.html

## Sources

- Upgrading to Gradle 9: https://docs.gradle.org/current/userguide/upgrading_major_version_9.html
- Official reference opened by Codex: https://docs.gradle.org/current/userguide/upgrading_major_version_9.html