ccampo133/dynamic_version.md

## dynamic_version.md

      
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              dynamic_version.md
            
          
    Here's a little trick to set a Maven project's version from the command line and environment variables, using a build profile.
Assuming your POM looks something like this:
<artifactId>example</artifactId>
<version>${project.version}</version>
...
<properties>
    <project.version>1.0.0</version>
</properties>
...
<profiles>
    <profile>
        <id>version-from-env</id>
        <activation>
            <property>
                <name>env.VERSION</name>
            </property>
        </activation>
        <properties>
            <project.version>${env.VERSION}</project.version>
        </properties>
    </profile>
</profiles>
When you build, and you set an environment variable called VERSION, the value of that env var will apply as the project's version. Also works as a -D arg, and falls back to 1.0.0 if nothing is set.
The profile can be set with the -P flag, e.g. -P version-from-env.
For more advanced version inference, see my Maven build plugin, maven-git-version