[MWRAPPER-143] - The wrapperVersion property is not used in only-script mode

[bdemers]

The only-script mode doesn't use the wrapper distribution, this property is now only added to the maven-wrapper.properties file when other types are used.

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Fixes #291

[jira-importer]

Resolve #291

[jira-importer]

Resolve #291

[cstamas]

Original issue that added version:
https://issues.apache.org/jira/browse/MWRAPPER-134

So, the intent of the version in the properties file was in fact to ease various automations to detect, and maybe suggest an upgrade for wrapper itself. We are now breaking automations for the second time...

Hence, this PR is wrong. And sorry for being late to the party.

[GreyTeardrop]

I'm in the same boat as @cstamas - only discovered this change when Renovate created an upgrade PR for Maven Wrapper to version 3.3.3 which removes the wrapperVersion property. If that PR gets merged, there won't be an easy way to get another update PR without a manual change. Please, consider rolling back this change…

[breun]

For update automation tools need a reliable way to determine the current version of Maven Wrapper. The wrapperVersion property was a way, although admittedly flawed, because I encounter a lot of projects with wrapperVersion bumped manually, but the mvnw* scripts from a much older version, because they were not updated along with the property.

I saw that Renovate plans to determine the Maven Wrapper version based on a regex check on the scripts themselves (renovatebot/renovate#37779), which should be more reliable than reading wrapperVersion, as long as the format of that comment line it’s parsed from doesn’t change, so it’s still a fragile method.

Could Maven Wrapper provide its version in a more robust (machine-readable) way?

[slawekjaranowski]

@breun please comments in open linked issue

[breun]

@breun please comments in open linked issue

Ok, comment reposted here: #364 (comment)