Sometimes during development web applications stuck and can't be undeployed. manually removing war archive is not possible because system says that file is used by another program.
But no other programs use archive except jboss process. Trying to remove stucked web application from Admin Console only stops the application but not removes it completely. The following exception is thrown in during the click on remove button in Admin Console

14:55:51,376 INFO [DeployHandler] Stop, [vfszip:/D:/jboss-5.1.0.GA/server/default/deploy/docflowweb.war/]
14:55:51,376 INFO [DeployHandler] End stop, [vfszip:/D:/jboss-5.1.0.GA/server/default/deploy/docflowweb.war/]
14:55:51,381 INFO [DeployHandler] Remove, [vfszip:/D:/jboss-5.1.0.GA/server/default/deploy/docflowweb.war/]
14:55:53,385 INFO [DeployHandler] Failed to complete command: [remove] for deployment: names=[vfszip:/D:/jboss-5.1.0.GA/server/default/deploy/docflowweb.war/], copyContent=true
java.io.IOException: Failed to delete: DelegatingHandler@15550946[path=docflowweb.war context=file:/D:/jboss-5.1.0.GA/server/default/deploy/ real=file:/D:/jboss-5.1.0.GA/server/default/deploy/docflowweb.war]
at org.jboss.system.server.profileservice.repository.BasicDeploymentRepository.removeDeployment(BasicDeploymentRepository.java:268)
at org.jboss.system.server.profileservice.repository.BasicDeploymentRepository.removeDeployment(BasicDeploymentRepository.java:229)
at org.jboss.profileservice.management.upload.remoting.DeployHandler.removeDeployment(DeployHandler.java:176)
at org.jboss.profileservice.management.upload.remoting.AbstractDeployHandler.remove(AbstractDeployHandler.java:333)
at org.jboss.profileservice.management.upload.remoting.AbstractDeployHandler.invoke(AbstractDeployHandler.java:185)
at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:891)
at org.jboss.remoting.transport.local.LocalClientInvoker.invoke(LocalClientInvoker.java:106)
at org.jboss.remoting.Client.invoke(Client.java:1724)
at org.jboss.remoting.Client.invoke(Client.java:629)
at org.jboss.profileservice.management.upload.remoting.StreamingDeploymentTarget.invoke(StreamingDeploymentTarget.java:305)
at org.jboss.profileservice.management.upload.remoting.StreamingDeploymentTarget.remove(StreamingDeploymentTarget.java:229)
at org.jboss.profileservice.management.upload.DeploymentProgressImpl.remove(DeploymentProgressImpl.java:321)
at org.jboss.profileservice.management.upload.DeploymentProgressImpl.run(DeploymentProgressImpl.java:94)
at org.rhq.plugins.jbossas5.util.DeploymentUtils.run(DeploymentUtils.java:120)
at org.rhq.plugins.jbossas5.StandaloneManagedDeploymentComponent.deleteResource(StandaloneManagedDeploymentComponent.java:326)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.rhq.core.pc.inventory.ResourceContainer$ComponentInvocationThread.call(ResourceContainer.java:482)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
14:55:53,843 ERROR [StandaloneManagedDeploymentComponent] Failed to remove deployment 'vfszip:/D:/jboss-5.1.0.GA/server/default/deploy/docflowweb.war/'.
java.lang.RuntimeException: java.io.IOException: Failed to delete: DelegatingHandler@15550946[path=docflowweb.war context=file:/D:/jboss-5.1.0.GA/server/default/deploy/ real=file:/D:/jboss-5.1.0.GA/server/default/deploy/docflowweb.war]
at org.jboss.profileservice.management.upload.remoting.StreamingDeploymentTarget.invoke(StreamingDeploymentTarget.java:313)
at org.jboss.profileservice.management.upload.remoting.StreamingDeploymentTarget.remove(StreamingDeploymentTarget.java:229)
at org.jboss.profileservice.management.upload.DeploymentProgressImpl.remove(DeploymentProgressImpl.java:321)
at org.jboss.profileservice.management.upload.DeploymentProgressImpl.run(DeploymentProgressImpl.java:94)
at org.rhq.plugins.jbossas5.util.DeploymentUtils.run(DeploymentUtils.java:120)
at org.rhq.plugins.jbossas5.StandaloneManagedDeploymentComponent.deleteResource(StandaloneManagedDeploymentComponent.java:326)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.rhq.core.pc.inventory.ResourceContainer$ComponentInvocationThread.call(ResourceContainer.java:482)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.IOException: Failed to delete: DelegatingHandler@15550946[path=docflowweb.war context=file:/D:/jboss-5.1.0.GA/server/default/deploy/ real=file:/D:/jboss-5.1.0.GA/server/default/deploy/docflowweb.war]
at org.jboss.system.server.profileservice.repository.BasicDeploymentRepository.removeDeployment(BasicDeploymentRepository.java:268)
at org.jboss.system.server.profileservice.repository.BasicDeploymentRepository.removeDeployment(BasicDeploymentRepository.java:229)
at org.jboss.profileservice.management.upload.remoting.DeployHandler.removeDeployment(DeployHandler.java:176)
at org.jboss.profileservice.management.upload.remoting.AbstractDeployHandler.remove(AbstractDeployHandler.java:333)
at org.jboss.profileservice.management.upload.remoting.AbstractDeployHandler.invoke(AbstractDeployHandler.java:185)
at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:891)
at org.jboss.remoting.transport.local.LocalClientInvoker.invoke(LocalClientInvoker.java:106)
at org.jboss.remoting.Client.invoke(Client.java:1724)
at org.jboss.remoting.Client.invoke(Client.java:629)
at org.jboss.profileservice.management.upload.remoting.StreamingDeploymentTarget.invoke(StreamingDeploymentTarget.java:305)
... 15 more
14:55:54,153 WARN [AbstractManagedObjectPopulator] Cannot create String name from non-Simple property: ManagedProperty

, value=null
14:55:54,159 WARN [AbstractManagedObjectPopulator] Cannot create String name from non-Simple property: ManagedProperty

, value=null

I think some thread in JBoss locks the war archive. something related to new vfs system that was introduced in JBoss 5.
No such problems occurred in JBoss 4.2.3 or early versions.