A very similar question was asked on the list some weeks ago.
You need to lock down the (specify) the version of maven-compiler-plugin.
You do that in the pluginManagement section. An example is here:
http://maven.apache.org/pom.html#Plugin_Management
(Note: You don't need to specify any executions though.)

/Anders

On Fri, Feb 4, 2011 at 06:16, Jonthan DeMaagd <[email protected]> wrote:

> [INFO] Scanning for projects...
>
> [WARNING]
>
> [WARNING] Some problems were encountered while building the effective model
> for org.sonatype.mavenbook.custom:simple-weather:jar:1.0
>
> [WARNING] 'build.plugins.plugin.version' for
> org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 69,
> column
> 12
>
> [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.
>
> [WARNING]
>
> ..
>
> ..
>
>
>
> Project builds and runs fine.
>
> But I really want to take care of these WARNINGS!
>
>
>
> Have not had much luck with tutorial, "Maven by Example" or online
> resources.
>
> Went to this as last resource!
>
>
>
> Thanks much!
>
>
>
>

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