Problem migrating from 6.10.4 to 7.0 Beta3

When trying to migrate to 7.0 Beta 3 from 6.10.4, the migration dialog goes back to the project properties dialog without triggering an update.

Here the stacktrace:

java.lang.NullPointerException
at sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:247)
at java.nio.file.Paths.get(Paths.java:84)
at com.haulmont.studio.intellij.ui.pm.Migrator_7_0.lambda$updateWebXmlFiles$16(Migrator_7_0.java:277)
at com.intellij.openapi.command.WriteCommandAction.lambda$runWriteCommandAction$5(WriteCommandAction.java:363)
at com.intellij.openapi.command.WriteCommandAction$BuilderImpl$1.run(WriteCommandAction.java:124)
at com.intellij.openapi.application.RunResult.run(RunResult.java:35)
at com.intellij.openapi.command.WriteCommandAction.lambda$null$1(WriteCommandAction.java:264)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1057)
at com.intellij.openapi.command.WriteCommandAction.lambda$performWriteCommandAction$2(WriteCommandAction.java:263)
at com.intellij.openapi.command.WriteCommandAction.lambda$doExecuteCommand$4(WriteCommandAction.java:321)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:220)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:188)
at com.intellij.openapi.command.WriteCommandAction.doExecuteCommand(WriteCommandAction.java:323)
at com.intellij.openapi.command.WriteCommandAction.performWriteCommandAction(WriteCommandAction.java:262)
at com.intellij.openapi.command.WriteCommandAction.execute(WriteCommandAction.java:244)
at com.intellij.openapi.command.WriteCommandAction$BuilderImpl.run(WriteCommandAction.java:126)
at com.intellij.openapi.command.WriteCommandAction.runWriteCommandAction(WriteCommandAction.java:363)
at com.intellij.openapi.command.WriteCommandAction.runWriteCommandAction(WriteCommandAction.java:355)
at com.haulmont.studio.intellij.ui.pm.Migrator_7_0.updateWebXmlFiles(Migrator_7_0.java:266)
at com.haulmont.studio.intellij.ui.pm.Migrator_7_0.migrate(Migrator_7_0.java:97)
at com.haulmont.studio.intellij.ui.pm.MigrationProcessor.migrate(MigrationProcessor.java:124)
at com.haulmont.studio.intellij.ui.pm.CubaProjectPropertiesPanel.migrateAndApply(CubaProjectPropertiesPanel.java:262)
at com.haulmont.studio.intellij.ui.pm.CubaProjectPropertiesPanel.stopProjectMigrateAndApply(CubaProjectPropertiesPanel.java:270)
at com.haulmont.studio.intellij.ui.pm.CubaProjectPropertiesPanel.applyBeforeMigrate(CubaProjectPropertiesPanel.java:239)
at com.haulmont.studio.intellij.ui.pm.CubaProjectPropertiesPanel.lambda$apply$5(CubaProjectPropertiesPanel.java:186)
at com.haulmont.studio.intellij.ui.pm.CubaProjectPropertiesPanel.checkIncompatibilityAppComponentVersions(CubaProjectPropertiesPanel.java:218)
at com.haulmont.studio.intellij.ui.pm.CubaProjectPropertiesPanel.apply(CubaProjectPropertiesPanel.java:186)
at com.haulmont.studio.intellij.ui.pm.CubaProjectPropertiesPanel.doOKAction(CubaProjectPropertiesPanel.java:179)
at com.intellij.openapi.ui.DialogWrapper$OkAction.doAction(DialogWrapper.java:1871)
at com.intellij.openapi.ui.DialogWrapper$DialogWrapperAction.actionPerformed(DialogWrapper.java:1831)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6548)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3325)
at java.awt.Component.processEvent(Component.java:6313)
at java.awt.Container.processEvent(Container.java:2237)
at java.awt.Component.dispatchEventImpl(Component.java:4903)
at java.awt.Container.dispatchEventImpl(Container.java:2295)
at java.awt.Component.dispatchEvent(Component.java:4725)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467)
at java.awt.Container.dispatchEventImpl(Container.java:2281)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4725)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764)
at java.awt.EventQueue.access$500(EventQueue.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:715)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:737)
at java.awt.EventQueue$4.run(EventQueue.java:735)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:719)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:664)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:363)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:109)
at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:190)
at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:235)
at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:233)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:233)
at java.awt.Dialog.show(Dialog.java:1077)
at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl$MyDialog.show(DialogWrapperPeerImpl.java:698)
at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl.show(DialogWrapperPeerImpl.java:430)
at com.intellij.openapi.ui.DialogWrapper.invokeShow(DialogWrapper.java:1681)
at com.intellij.openapi.ui.DialogWrapper.show(DialogWrapper.java:1630)
at com.haulmont.studio.intellij.action.cubamenu.CubaProjectPropertiesAction.doActionPerformed(CubaProjectPropertiesAction.java:25)
at com.haulmont.studio.intellij.action.CubaProjectAction.actionPerformed(CubaProjectAction.java:76)
at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:258)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:275)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$0(ActionMenuItem.java:287)
at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:283)
at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:106)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:277)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$0(ActionMenuItem.java:111)
at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88)
at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:111)
at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:120)
at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:122)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:111)
at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:522)
at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:35)
at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:544)
at java.awt.Component.processMouseEvent(Component.java:6548)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3325)
at java.awt.Component.processEvent(Component.java:6313)
at java.awt.Container.processEvent(Container.java:2237)
at java.awt.Component.dispatchEventImpl(Component.java:4903)
at java.awt.Container.dispatchEventImpl(Container.java:2295)
at java.awt.Component.dispatchEvent(Component.java:4725)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467)
at java.awt.Container.dispatchEventImpl(Container.java:2281)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4725)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764)
at java.awt.EventQueue.access$500(EventQueue.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:715)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:737)
at java.awt.EventQueue$4.run(EventQueue.java:735)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:719)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:664)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:363)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

Thanks for reporting the issue.

Problem seems to be caused by invalid handling of the buildWar task defined in the project.
As a workaround you can comment task definition in the build.gradle file, update the project and then uncomment it.
Also please check your project files. They should be migrated even with the error mentioned above.

Please note that you should have auto-import enabled in Gradle settings, to Studio correctly handle project properties modification.

Thank you. I was able to migrate by commenting out the builWar section.
For reference, this was the content:

task buildWar(type: CubaWarBuilding) {
    coreContextXmlPath = 'modules/core/web/META-INF/war-context.xml'
    appProperties = ['cuba.automaticDatabaseUpdate':'true']
['cuba.web.productionMode':'true']
    singleWar = false
    includeContextXml = true
    includeJdbcDriver = true
    appHome = '/var/lib/tomcat8/webapps'
}