Appears to not work with groovy files?

[David Logan]

java.lang.ClassCastException: org.jetbrains.plugins.groovy.lang.psi.impl.GroovyFileImpl cannot be cast to com.intellij.psi.PsiJavaFile at org.pmesmeur.sketchit.diagram.clazz.ClassDiagramGenerator$RelationshipsGenerator.classIsFromJavaLangPackage(ClassDiagramGenerator.java:485) at org.pmesmeur.sketchit.diagram.clazz.ClassDiagramGenerator$RelationshipsGenerator.generateClassInheritence(ClassDiagramGenerator.java:477) at org.pmesmeur.sketchit.diagram.clazz.ClassDiagramGenerator$RelationshipsGenerator.generate(ClassDiagramGenerator.java:456) at org.pmesmeur.sketchit.diagram.clazz.ClassDiagramGenerator.generate(ClassDiagramGenerator.java:167) at org.pmesmeur.sketchit.diagram.UmlModuleClassDiagram.generateDiagram(UmlModuleClassDiagram.java:48) at org.pmesmeur.sketchit.diagram.UmlDiagram.generateDiagram(UmlDiagram.java:43) at org.pmesmeur.sketchit.diagram.UmlDiagram.generate(UmlDiagram.java:24) at org.pmesmeur.sketchit.diagram.UmlDiagramsGenerator.generateModuleClassDiagram(UmlDiagramsGenerator.java:44) at org.pmesmeur.sketchit.diagram.UmlDiagramsGenerator.generateClassDiagrams(UmlDiagramsGenerator.java:35) at org.pmesmeur.sketchit.SketchIt.generatePlantUmlDiagram(SketchIt.java:62) at org.pmesmeur.sketchit.SketchIt.actionBody(SketchIt.java:49) at org.pmesmeur.sketchit.SketchIt.access$000(SketchIt.java:13) at org.pmesmeur.sketchit.SketchIt$1.run(SketchIt.java:36) at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1057) at org.pmesmeur.sketchit.SketchIt.runInsideAnIntellijWriteAction(SketchIt.java:34) at org.pmesmeur.sketchit.SketchIt.actionPerformed(SketchIt.java:28) 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$1(TransactionGuardImpl.java:111) at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:120) at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:122) at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:111) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:308) at javax.swing.AbstractButton.doClick(AbstractButton.java:376) at com.apple.laf.ScreenMenuItemCheckbox.itemStateChanged(ScreenMenuItemCheckbox.java:193) at java.awt.CheckboxMenuItem.processItemEvent(CheckboxMenuItem.java:389) at java.awt.CheckboxMenuItem.processEvent(CheckboxMenuItem.java:357) at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:355) at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:343) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:767) 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:668) 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)