Maven Web Fragment projects are deployed as exploded jars in Eclipse

Jboss Servers doesn't start in eclipse when webfragment projects are included via pom.xml as dependency.

Works fine, when the war-file(containing the jars) is deployed on the server.
Starting in eclipse, jboss tries to unpack the jars to WEB-INF\lib and fails.

14:43:55,509 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-3) MSC00001: Failed to start service jboss.deployment.unit."ncWheel-Prototype-webapp.war".STRUCTURE: org.jboss.msc.service.StartException in service jboss.deployment.unit."ncWheel-Prototype-webapp.war".STRUCTURE: Failed to process phase STRUCTURE of deployment "ncWheel-Prototype-webapp.war"
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:121) [jboss-as-server-7.1.0.Beta1.jar:]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1824) [jboss-msc-1.0.1.GA.jar:]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1759) [jboss-msc-1.0.1.GA.jar:]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [:1.7.0_02]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [:1.7.0_02]
at java.lang.Thread.run(Unknown Source) [:1.7.0_02]
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: org.jboss.as.server.deployment.DeploymentUnitProcessingException: failed to process "/D:/Projekte/NCwheel/jboss-as-7.1.0.Beta1/standalone/deployments/ncWheel-Prototype-webapp.war/WEB-INF/lib/ncWheel-Prototype-workload-1.0-SNAPSHOT.jar"
at org.jboss.as.web.deployment.WarStructureDeploymentProcessor.deploy(WarStructureDeploymentProcessor.java:118)
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:115) [jboss-as-server-7.1.0.Beta1.jar:]
... 5 more
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: failed to process "/D:/Projekte/NCwheel/jboss-as-7.1.0.Beta1/standalone/deployments/ncWheel-Prototype-webapp.war/WEB-INF/lib/ncWheel-Prototype-workload-1.0-SNAPSHOT.jar"
at org.jboss.as.web.deployment.WarStructureDeploymentProcessor.createWebInfLibResources(WarStructureDeploymentProcessor.java:173)
at org.jboss.as.web.deployment.WarStructureDeploymentProcessor.createResourceRoots(WarStructureDeploymentProcessor.java:151)
at org.jboss.as.web.deployment.WarStructureDeploymentProcessor.deploy(WarStructureDeploymentProcessor.java:112)
... 6 more
Caused by: java.util.zip.ZipException: zip file is empty
at java.util.zip.ZipFile.open(Native Method) [:1.7.0_02]
at java.util.zip.ZipFile.<init>(Unknown Source) [:1.7.0_02]
at java.util.zip.ZipFile.<init>(Unknown Source) [:1.7.0_02]
at java.util.jar.JarFile.<init>(Unknown Source) [:1.7.0_02]
at java.util.jar.JarFile.<init>(Unknown Source) [:1.7.0_02]
at org.jboss.vfs.spi.JavaZipFileSystem.<init>(JavaZipFileSystem.java:97)
at org.jboss.vfs.spi.JavaZipFileSystem.<init>(JavaZipFileSystem.java:83)
at org.jboss.vfs.VFS.mountZip(VFS.java:408)
at org.jboss.vfs.VFS.mountZip(VFS.java:434)
at org.jboss.as.web.deployment.WarStructureDeploymentProcessor.createWebInfLibResources(WarStructureDeploymentProcessor.java:168)
... 8 more