If for some reason, you do not want to use module (*.iml) references for your IDEA project, you can choose to do so using:
mvn idea:idea -DlinkModules=false
or in your pom.xml:
<project> [...] <build> [...] <plugins> [...] <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-idea-plugin</artifactId> <version>2.2.1</version> <configuration> <linkModules>false</linkModules> </configuration> </plugin> [...] </plugins> [...] </build> [...] </project>