Creating the directory structure of a J2EE project can be tedious. However, if you would use maven-archetype-j2ee-simple, the usual directories for a j2ee project would be provided for you.
mvn archetype:create -DgroupId=[your project's group id] -DartifactId=[your project's artifact id] -DarchetypeArtifactId=maven-archetype-j2ee-simple
This would then create a maven project.
. |-- ear | `-- pom.xml |-- ejb | |-- src | | `-- main | | `-- resources | | `-- META-INF | | `-- ejb-jar.xml | `-- pom.xml |-- primary-source | `-- pom.xml |-- projects | |-- logging | | `-- pom.xml | `-- pom.xml |-- servlets | |-- servlet | | |-- src | | | `-- main | | | `-- webapp | | | |-- WEB-INF | | | | `-- web.xml | | | `-- index.jsp | | `-- pom.xml | `-- pom.xml |-- src | `-- main | `-- resources `-- pom.xml