Adding "withSourcesJar" in a Gradle quarkus-cxf build causes duplicate sources to appear in JAR

[jskillin-idt]

Describe the bug

This was originally reported at quarkiverse/quarkus-cxf#859 but was re-reported here by request.

A project with at least the following lines triggers a build failure, in which the generated source from the WSDL is attempted to be packaged more than once in the source JAR:

plugins {
    // ...
    id 'java'
    id 'io.quarkus' // 3.0.1.Final
}

// ...
dependencies {
    // ...
    implementation 'io.quarkiverse.cxf:quarkus-cxf:2.0.2'
}
// ...
java {
    // ...
    withSourcesJar()
}
// ...

An example failure using the reproducer:

> Task :sourcesJar FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':sourcesJar'.
> Entry wsdl2java/org/jboss/eap/quickstarts/wscalculator/calculator/Multiply.java is a duplicate but no duplicate handling strategy has been set. Please refer to https://docs.gradle.org/8.1.1/dsl/org.gradle.api.tasks.Copy.html#org.gradle.api.tasks.Copy:duplicatesStrategy for details.

Expected behavior

No response

Actual behavior

No response

How to Reproduce?

Reproducer: https://github.com/jskillin-idt/quarkiverse-quarkus-cxf-issues-859

Output of uname -a or ver

No response

Output of java -version

No response

GraalVM version (if different from Java)

No response

Quarkus version or git rev

3.0.1.Final

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

Gradle 8.1.1

Additional information

No response

[quarkus-bot]

/cc @glefloch, @quarkusio/devtools