I have build errors with m2eclipse but not with maven2 on the command line - is my m2eclipse misconfigured?

I installed m2eclipse to build a java project in Eclipse.

I imported the project as follows:

Import->
Maven->
Existing Maven Projects->
Import Maven Projects->
- Select root directory
- Select pom file
- Click Finish

To be sure m2eclipse was actually building the project, I deleted the target directory and made sure it was re-created by m2eclipse and it was. But unlike with the command-line version of maven which built everything perfectly, m2eclipse leaves a large number of build errors in the source code.

Is it possible that I did not configure m2eclipse properly? How would I check this?

This is a github link to the project I'm trying to build. I'm getting the @Override build errors at this line. It says "The method createNewToken must override a superclass method".