When I undeploy/redeploy my app I get: Deploying application in domain failed; Cannot deploy. Module directory is locked and cannot be deleted: C:\glassfish\domains\domain1\applications\j2ee-modules\RecDev Cannot deploy. Module directory is locked and cannot be deleted: C:\glassfish\domains\domain1\applications\j2ee-modules\RecDev This happened before, seemed to go away, but it is still happening. My app is a fairly simple test app: Glassfish ur1_b05 Embedded JSF Facelets 1.1.11 MySQL with connector 3.1.13