Turns out we need the complete EE API (in order to use `@EJB` and `@Stateless`). I'm going to replace this with

    <dependency>
        <groupId>org.jboss.spec</groupId>
        <artifactId>jboss-javaee-6.0</artifactId>
        <version>3.0.2.Final</version>
        <type>pom</type>
    </dependency>

There is also a `jboss-javaee-7.0`, but this currently only exists as snapshot version. But this shouldn't be a problem since we only depend on stuff which is there in EE 6 as well.