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Deleting a UML project not always delete the project from disk. From the log there are issues with subversion support. I know I've seen this somewhere else for normal projects (maybe I wrote it myself). Probably the same type of fix is needed. Here's the related log: INFO [org.netbeans.modules.subversion]: org.tigris.subversion.javahl.ClientException: The process cannot access the file because it is being used by another process. svn: Can't remove 'Z:\Netbeans\jWrestling Project\jWrestling-Model\.QueryCache' svn: Can't remove file 'Z:\Netbeans\jWrestling Project\jWrestling-Model\.QueryCache': The process cannot access the file because it is being used by another process. msg Caused: org.tigris.subversion.javahl.ClientException: The process cannot access the file because it is being used by another process. svn: Can't remove 'Z:\Netbeans\jWrestling Project\jWrestling-Model\.QueryCache' svn: Can't remove file 'Z:\Netbeans\jWrestling Project\jWrestling-Model\.QueryCache': The process cannot access the file because it is being used by another process. at org.tigris.subversion.javahl.SVNClient.remove(Native Method) at org.tigris.subversion.javahl.SVNClient.remove(SVNClient.java:404) at org.tigris.subversion.svnclientadapter.javahl.AbstractJhlClientAdapter.remove(AbstractJhlClientAdapter.java:819) Caused: org.tigris.subversion.svnclientadapter.SVNClientException at org.tigris.subversion.svnclientadapter.javahl.AbstractJhlClientAdapter.remove(AbstractJhlClientAdapter.java:822) 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.netbeans.modules.subversion.client.SvnClientInvocationHandler.handle(SvnClientInvocationHandler.java:365) at org.netbeans.modules.subversion.client.SvnClientInvocationHandler.invokeMethod(SvnClientInvocationHandler.java:329) at org.netbeans.modules.subversion.client.SvnClientInvocationHandler$2.call(SvnClientInvocationHandler.java:175) at org.netbeans.modules.versioning.indexingbridge.Bridge$1.call(Bridge.java:64) at org.netbeans.modules.parsing.api.indexing.IndexingManager.runProtected(IndexingManager.java:304) at org.netbeans.modules.versioning.indexingbridge.Bridge.runWithoutIndexing(Bridge.java:59) at org.netbeans.modules.versioning.util.IndexingBridge.runWithoutIndexing(IndexingBridge.java:133) at org.netbeans.modules.versioning.util.IndexingBridge.runWithoutIndexing(IndexingBridge.java:102) at org.netbeans.modules.subversion.client.SvnClientInvocationHandler.invoke(SvnClientInvocationHandler.java:185) at $Proxy18.remove(Unknown Source) at org.netbeans.modules.subversion.FilesystemHandler.doDelete(FilesystemHandler.java:124) at org.netbeans.modules.versioning.FilesystemInterceptor$DelegatingInterceptor.delete(FilesystemInterceptor.java:545) at org.netbeans.modules.masterfs.ProvidedExtensionsProxy$DelegatingDeleteHandler$1.run(ProvidedExtensionsProxy.java:324) at org.netbeans.modules.masterfs.ProvidedExtensionsProxy.runCheckCode(ProvidedExtensionsProxy.java:309) at org.netbeans.modules.masterfs.ProvidedExtensionsProxy.access$300(ProvidedExtensionsProxy.java:66) at org.netbeans.modules.masterfs.ProvidedExtensionsProxy$DelegatingDeleteHandler.delete(ProvidedExtensionsProxy.java:322) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj.deleteFile(FolderObj.java:474) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj.delete(FolderObj.java:307) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj$2.call(BaseFileObj.java:637) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj$2.call(BaseFileObj.java:632) at org.netbeans.modules.masterfs.filebasedfs.FileBasedFileSystem.runAsInconsistent(FileBasedFileSystem.java:115) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.delete(BaseFileObj.java:645) at org.openide.filesystems.FileObject.delete(FileObject.java:368) at org.netbeans.modules.uml.project.ui.nodes.UMLPhysicalViewProvider$UMLLogicalViewRootNode.destroy(UMLPhysicalViewProvider.java:453) at org.netbeans.modules.uml.project.UMLActionProvider.invokeAction(UMLActionProvider.java:99) at org.netbeans.modules.project.ui.actions.ProjectAction.actionPerformed(ProjectAction.java:134) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.actionPerformed(LookupSensitiveAction.java:170) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.AbstractButton.doClick(AbstractButton.java:357) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1223) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1264) at java.awt.Component.processMouseEvent(Component.java:6263) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:6028) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4630) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168) at java.awt.Container.dispatchEventImpl(Container.java:2085) at java.awt.Window.dispatchEventImpl(Window.java:2478) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) [catch] at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) Subversion failed to delete Z:\Netbeans\jWrestling Project\jWrestling-Model org.tigris.subversion.javahl.ClientException: The process cannot access the file because it is being used by another process. svn: Can't remove 'Z:\Netbeans\jWrestling Project\jWrestling-Model\.QueryCache' svn: Can't remove file 'Z:\Netbeans\jWrestling Project\jWrestling-Model\.QueryCache': The process cannot access the file because it is being used by another process.