Created attachment 916333 [details]
Reproducer app

Description of problem:
When deploying two war applications containing resteasy-spring jar, second deployment fails.

Version-Release number of selected component (if applicable):
EAP 6.3.0.ER9

How reproducible:
always

Steps to Reproduce:
1. Take two war files (rename one from the attachment)
2. Start EAP in standalone mode
3. Copy both wars into $JBOSS_HOME/standalone/deployments

Actual results:
First war deployment succeeds, second deployment results to the following error:

13:10:54,277 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-3) JBAS015876: Starting deployment of "resteasy-spring-integration-test2.war" (runtime-name: "resteasy-spring-integration-test2.war")
13:10:55,496 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-8) MSC000001: Failed to start service jboss.deployment.unit."resteasy-spring-integration-test2.war".DEPENDENCIES: org.jboss.msc.service.StartException in service jboss.deployment.unit."resteasy-spring-integration-test2.war".DEPENDENCIES: JBAS018733: Failed to process phase DEPENDENCIES of deployment "resteasy-spring-integration-test2.war"
	at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:166) [jboss-as-server-7.4.0.Final-redhat-18.jar:7.4.0.Final-redhat-18]
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1980) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1913) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [rt.jar:1.6.0_45]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [rt.jar:1.6.0_45]
	at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_45]
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: org.jboss.as.server.deployment.DeploymentUnitProcessingException: java.io.IOException: VFS000017: Filesystem already mounted at mount point ""/home/kanovotn/RESTEasy/EAP_6.3.0.ER9/jboss-eap-6.3/modules/system/layers/base/org/jboss/resteasy/resteasy-spring/main/bundled/resteasy-spring-jar/resteasy-spring-2.3.8.Final-redhat-3.jar""
	at org.jboss.as.jaxrs.deployment.JaxrsSpringProcessor.deploy(JaxrsSpringProcessor.java:204)
	at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:159) [jboss-as-server-7.4.0.Final-redhat-18.jar:7.4.0.Final-redhat-18]
	... 5 more
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: java.io.IOException: VFS000017: Filesystem already mounted at mount point ""/home/kanovotn/RESTEasy/EAP_6.3.0.ER9/jboss-eap-6.3/modules/system/layers/base/org/jboss/resteasy/resteasy-spring/main/bundled/resteasy-spring-jar/resteasy-spring-2.3.8.Final-redhat-3.jar""
	at org.jboss.as.jaxrs.deployment.JaxrsSpringProcessor.getResteasySpringVirtualFile(JaxrsSpringProcessor.java:134)
	at org.jboss.as.jaxrs.deployment.JaxrsSpringProcessor.deploy(JaxrsSpringProcessor.java:200)
	... 6 more
Caused by: java.io.IOException: VFS000017: Filesystem already mounted at mount point ""/home/kanovotn/RESTEasy/EAP_6.3.0.ER9/jboss-eap-6.3/modules/system/layers/base/org/jboss/resteasy/resteasy-spring/main/bundled/resteasy-spring-jar/resteasy-spring-2.3.8.Final-redhat-3.jar""
	at org.jboss.vfs.VFS.mount(VFS.java:127) [jboss-vfs-3.2.5.Final-redhat-1.jar:3.2.5.Final-redhat-1]
	at org.jboss.vfs.VFS.doMount(VFS.java:336) [jboss-vfs-3.2.5.Final-redhat-1.jar:3.2.5.Final-redhat-1]
	at org.jboss.vfs.VFS.mountZip(VFS.java:360) [jboss-vfs-3.2.5.Final-redhat-1.jar:3.2.5.Final-redhat-1]
	at org.jboss.as.jaxrs.deployment.JaxrsSpringProcessor.getResteasySpringVirtualFile(JaxrsSpringProcessor.java:114)
	... 7 more

Expected results:
Both wars are deployed successfully.

Additional info:
This issue was reproduced on 6.3.0.ER9 only. I doesn't apply to 6.3.0.ER7 and 6.2.4.