'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing

[beroal]

A build is successful, but gives the following warning.

[WARNING] Some problems were encountered while building the effective model for com.github.juanmf:java2PlantUML-maven-plugin:maven-plugin:1.0.1
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 72, column 21
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.

[juanmf]

Thanks, I'll try to make some time to review this.