Java Moods: Maven Enforcer Plugin: cool and annoying

Java Moods: Maven Enforcer Plugin: cool and annoying

As a Maven expert, you probably have heard of maven-enforcer-plugin, "The Loving Iron Fist of Maven", as they say.

It's so cool!

The idea is pretty cool: the plugin provides goals to ensure that the environment used to run Maven is like you – the POM author – expected it to be. There are checks for constraints on the version of Maven or JDK, on the OS family, to enforce certain dependency requirements, and much more. This list on the web site gives you an impression on what kind of checks are provided.

Do you know what happens when you write your POMs and settings for Maven version 2.0.9 or greater, but somebody is still using an outdated 2.0.4? Well, this kind of issues is annoying and you better make sure it does not happen.

The current version of maven-enforcer-plugin (at the time we set it up) was 1.0-alpha-4 which sounded not very mature, but nevertheless we decided to use it. For our projects, we identified a couple of things we wanted to check, and we configured the plugin accordingly:

• Java Version: should be 1.5.
• Maven version: must at least be 2.1.0.
• Enforce defined versions for all plugins, and disallow any use of "LATEST", "RELEASE" or "SNAPSHOT" as a version for any plugin.

Hey, SNAPSHOT plugins are just dangerous and you should never, never ever depend on them. The only exclusion could be plugins developed inhouse, but actually, no – not really. Bah, don't use SNAPSHOT plugins. Period.

So, we tried to setup our enforcer plugin configuration like this:

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