ModuleNotFoundException for "*.jar" when deploying WAR on JBoss EAP 6

Issue

When deploying the .war, the following error is encountered:

ERROR [org.jboss.msc.service.fail] (MSC service thread 1-10) MSC000001: Failed to start service jboss.module.service."deployment.myapp.war".main: org.jboss.msc.service.StartException in service jboss.module.service."deployment.myapp.war".main: JBAS018759: Failed to load module: deployment.myapp.war:main
    at org.jboss.as.server.moduleservice.ModuleLoadService.start(ModuleLoadService.java:91) [jboss-as-server-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [classes.jar:1.6.0_65]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [classes.jar:1.6.0_65]
    at java.lang.Thread.run(Thread.java:695) [classes.jar:1.6.0_65]
Caused by: org.jboss.modules.ModuleNotFoundException: j2ee.jar:main
    at org.jboss.modules.Module.addPaths(Module.java:1030) [jboss-modules.jar:1.3.0.Final-redhat-2]
    at org.jboss.modules.Module.link(Module.java:1386) [jboss-modules.jar:1.3.0.Final-redhat-2]
    at org.jboss.modules.Module.relinkIfNecessary(Module.java:1414) [jboss-modules.jar:1.3.0.Final-redhat-2]
    at org.jboss.modules.ModuleLoader.loadModule(ModuleLoader.java:242) [jboss-modules.jar:1.3.0.Final-redhat-2]
    at org.jboss.as.server.moduleservice.ModuleLoadService.start(ModuleLoadService.java:70) [jboss-as-server-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
    ... 5 more

We have no reference to j2ee.jar in our WEB-INF/jboss-deployment-structure.xml