Hot deploying a web app fails

When I dropped the embedded console into the /deploy folder I got the following exception. But when I simply restarted the app server it deployed fine.

16:50:26,062 INFO [ServerImpl] JBoss (Microcontainer) [5.1.0.Beta1 (build: SVNTag=JBoss_5_1_0_Beta1 date=200903111033)] Sta
rted in 1m:22s:891ms
17:00:10,796 WARN [HDScanner] Scan failed
org.jboss.deployers.spi.DeploymentException: Error determining structure: jbas5-admin-console.war
at org.jboss.deployers.spi.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:49)
at org.jboss.deployers.vfs.plugins.structure.explicit.DeclaredStructure.determineStructure(DeclaredStructure.java:89
)
at org.jboss.deployers.vfs.plugins.structure.StructureDeployerWrapper.determineStructure(StructureDeployerWrapper.ja
va:73)
at org.jboss.deployers.vfs.plugins.structure.VFSStructuralDeployersImpl.doDetermineStructure(VFSStructuralDeployersI
mpl.java:196)
at org.jboss.deployers.vfs.plugins.structure.VFSStructuralDeployersImpl.determineStructure(VFSStructuralDeployersImp
l.java:221)
at org.jboss.deployers.structure.spi.helpers.AbstractStructuralDeployers.determineStructure(AbstractStructuralDeploy
ers.java:77)
at org.jboss.deployers.plugins.main.MainDeployerImpl.determineStructure(MainDeployerImpl.java:1000)
at org.jboss.deployers.plugins.main.MainDeployerImpl.determineDeploymentContext(MainDeployerImpl.java:440)
at org.jboss.deployers.plugins.main.MainDeployerImpl.addDeployment(MainDeployerImpl.java:390)
at org.jboss.deployers.plugins.main.MainDeployerImpl.addDeployment(MainDeployerImpl.java:300)
at org.jboss.system.server.profileservice.repository.MainDeployerAdapter.addDeployment(MainDeployerAdapter.java:86)
at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:317)
at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:229)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:280)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:135)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:
65)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java
:142)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:166)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.RuntimeException: java.util.zip.ZipException: The process cannot access the file because it is being us
ed by another process
at org.jboss.virtual.plugins.context.AbstractExceptionHandler.handleZipEntriesInitException(AbstractExceptionHandler
.java:39)
at org.jboss.virtual.plugins.context.helpers.NamesExceptionHandler.handleZipEntriesInitException(NamesExceptionHandl
er.java:63)
at org.jboss.virtual.plugins.context.zip.ZipEntryContext.ensureEntries(ZipEntryContext.java:610)
at org.jboss.virtual.plugins.context.zip.ZipEntryContext.checkIfModified(ZipEntryContext.java:757)
at org.jboss.virtual.plugins.context.zip.ZipEntryContext.getChild(ZipEntryContext.java:801)
at org.jboss.virtual.plugins.context.zip.ZipEntryHandler.createChildHandler(ZipEntryHandler.java:191)
at org.jboss.virtual.plugins.context.AbstractVirtualFileHandler.structuredFindChild(AbstractVirtualFileHandler.java:
681)
at org.jboss.virtual.plugins.context.zip.ZipEntryHandler.getChild(ZipEntryHandler.java:165)
at org.jboss.virtual.plugins.context.DelegatingHandler.getChild(DelegatingHandler.java:107)
at org.jboss.virtual.VirtualFile.getChild(VirtualFile.java:481)
at org.jboss.deployers.vfs.plugins.structure.explicit.DeclaredStructure.determineStructure(DeclaredStructure.java:64
)
... 20 more
Caused by: java.util.zip.ZipException: The process cannot access the file because it is being used by another process
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:203)
at java.util.zip.ZipFile.<init>(ZipFile.java:234)
at org.jboss.virtual.plugins.context.zip.ZipFileWrapper.ensureZipFile(ZipFileWrapper.java:175)
at org.jboss.virtual.plugins.context.zip.ZipFileWrapper.acquire(ZipFileWrapper.java:245)
at org.jboss.virtual.plugins.context.zip.ZipEntryContext.initEntries(ZipEntryContext.java:470)
at org.jboss.virtual.plugins.context.zip.ZipEntryContext.ensureEntries(ZipEntryContext.java:603)
... 28 more