null version value is ignored in shadowJar configuration

[alexeyOnGitHub]

Shadow Version

5.1.0

Gradle Version

5.6

Expected Behavior

I want the final artifact name to not have version number in it, so I am trying this snippet from documentation:

shadowJar {
    baseName = 'shadow'
    classifier = null
    version = null
}

also tried

shadowJar {
    classifier = null
    archiveVersion = null
}

Actual Behavior

"classifier" is removed as expected, but "version" is still added to the final artifact name.

[Bo98]

This is caused by a breaking change in gradle/gradle#9776.

It's noted here:

Setting Property value to null uses the property convention

Previously, calling Property.set(null) would always reset the value of the property to 'not defined'. Now, the convention that is associated with the property using the convention() method will be used to determine the value of the property.

This is perhaps not very obvious however as version is documented as String and not Property<String>. In Gradle 5.1, version was deprecated and replaced by archiveVersion which is a Property<String>, and internally version just maps to archiveVersion.

Try use version = "" or archiveVersion = "" instead.

The shadowJar docs will need updating because of this change.