I added few jar files that are related to taglibs.
Afetr that I wanted to delete them from WEB-INF/lib 
directory. When I try to delete I get the following 
exception

Tue Jun 04 12:27:35 PDT 2002: 
org.openide.filesystems.FSException:  Cannot delete file 
WEB-INF/lib/js.jar in D:\temp.
org.openide.filesystems.FSException: Cannot delete file 
WEB-INF/lib/js.jar in D:\temp.
        at org.openide.filesystems.FSException.io
(FSException.java:78)
        at org.openide.filesystems.LocalFileSystem.delete
(LocalFileSystem.java:321)
        at org.netbeans.core.ExLocalFileSystem.delete
(ExLocalFileSystem.java:75)
        at 
org.openide.filesystems.LocalFileSystem$Impl.delete
(LocalFileSystem.java:659)
        at 
org.openide.filesystems.AbstractFileObject.delete
(AbstractFileObject.java:480)
        at 
org.netbeans.modules.web.context.DefaultDataObject.handleDe
lete(LibJarObject.java:145)
        at 
org.netbeans.modules.web.context.LibJarObject.handleDelete
(LibJarObject.java:72)
        at org.openide.loaders.DataObject$2.run
(DataObject.java:524)
        at 
org.openide.filesystems.EventControl.runAtomicAction
(EventControl.java:89)
        at 
org.openide.filesystems.FileSystem.runAtomicAction
(FileSystem.java:388)
        at org.openide.loaders.DataObject.delete
(DataObject.java:522)
        at org.openide.loaders.DataNode.destroy
(DataNode.java:219)
        at org.openide.nodes.FilterNode.destroy
(FilterNode.java:399)
        at 
org.openide.explorer.ExplorerActions$DeleteActionPerformer$
DestroyAtomic.invoke(ExplorerActions.java:527)
        at $Proxy4.run(Unknown Source)
        at 
org.openide.filesystems.EventControl.runAtomicAction
(EventControl.java:89)
        at 
org.openide.filesystems.FileSystem.runAtomicAction
(FileSystem.java:388)
        at 
org.openide.explorer.ExplorerActions$DestroyInvoker.run
(ExplorerActions.java:568)
        at 
org.openide.explorer.ExplorerActions$DeleteActionPerformer.
doDestroy(ExplorerActions.java:494)
        at 
org.openide.explorer.ExplorerActions$DeleteActionPerformer.
performAction(ExplorerActions.java:463)
        at 
org.openide.util.actions.CallbackSystemAction.performAction
(CallbackSystemAction.java:109)
        at 
org.openide.util.actions.CallableSystemAction.actionPerform
ed(CallableSystemAction.java:69)
        at org.netbeans.core.ModuleActions$1.run
(ModuleActions.java:105)
        at org.openide.util.Task.run(Task.java:152)
[catch] at 
org.openide.util.RequestProcessor$ProcessorThread.run
(RequestProcessor.java:622)