Quarkus output class in incorrect folder on live reload (gradle, multimodule, kotlin)

[ylemoigne]

Describe the bug

In a gradle project with :

• a common module using java+kotlin+jandex
• an app module using java+quarkus

Once the app started, if we modify a java source of the common module
And trigger a live reload
Then the java class is produced in common/build/resources directory rather than common/build/classes directory.

Once this has happened, app restart won't work with message like :

Execution failed for task ':common:jar'.
> Entry fr/common/Foo.class is a duplicate but no duplicate handling strategy has been set

Expected behavior

On live reload recompilation, classes should be produced in build/classes directory ; (event if there is the kotlin plugin)

Actual behavior

Class produced in resource folder leading to on future start :

Execution failed for task ':common:jar'.
> Entry fr/common/Foo.class is a duplicate but no duplicate handling strategy has been set

How to Reproduce?

quarkus-bug-common-lib.zip

Using the attached zip, launch ./gradlew :app:quarkusDev
Modifiy common/src/main/java/fr/common/Foo.java (even the comment line).
Open browser to http://localhost:8080 to trigger a live reload.

See that common/build/resources contains file fr/common/Foo.class
Stop the app with Ctrl+c, then launch again ./gradlew :app:quarkusDev
Error about duplicate resource when executing jar task (because the class file is both in build/classes and build/ressources)

Output of uname -a or ver

Darwin MacBook-Pro-de-Yann.local 23.6.0 Darwin Kernel Version 23.6.0: Mon Jul 29 21:13:04 PDT 2024; root:xnu-10063.141.2~1/RELEASE_ARM64_T6020 arm64

Output of java -version

openjdk version "21.0.3" 2024-04-16 LTS OpenJDK Runtime Environment Temurin-21.0.3+9 (build 21.0.3+9-LTS) OpenJDK 64-Bit Server VM Temurin-21.0.3+9 (build 21.0.3+9-LTS, mixed mode)

Quarkus version or git rev

3.13.3

Build tool (ie. output of mvnw --version or gradlew --version)

Gradle 8.8

Additional information

No response

[quarkus-bot]

/cc @geoand (kotlin), @glefloch, @quarkusio/devtools