`NoClassDefFoundError` from `GenerateTestsAction` is thrown in IDE when a Python class is right-clicked

[alisevych]

Description

GenerateTestsAction#update@ProjectViewPopup thrown NoClassDefFoundError from PythonLanguageAssistant.getPsiTargets
in IDEA - just after Python plugin is installed - without restart.

To Reproduce

1. Run the 'utbot' project in IntelliJ Idea 2022.2.4 Ultimate
2. Python plugin is NOT installed
3. Install the latest UTBotJava builds from main
4. Set Experimental languages support to true (File -> Settings -> Tools -> UnitTestBot)
5. Open Plugins, install Python plugin, click Ok
6. Do NOT restart IDE
7. In Project view right-click on utbot-python/samples/easy_samples/annotations2.py

Expected behavior

Generate Tests with UnitTestBot... action should be present in context menu.
No exception is expected to be thrown.

Actual behavior

Generate Tests with UnitTestBot... action is absent.
NoClassDefFoundError is thrown in IDE (see details below)

Visual proofs (screenshots, logs, images)

GenerateTestsAction#update@ProjectViewPopup (org.utbot.intellij.plugin.ui.actions.GenerateTestsAction), actionId=org.utbot.intellij.plugin.ui.actions.GenerateTestsAction, text='Generate Tests with UnitTestBot...'

java.lang.NoClassDefFoundError: com/jetbrains/python/psi/PyFile
	at org.utbot.intellij.plugin.language.python.PythonLanguageAssistant.getPsiTargets(PythonLanguageAssistant.kt:51)
	at org.utbot.intellij.plugin.language.python.PythonLanguageAssistant.update(PythonLanguageAssistant.kt:46)
	at org.utbot.intellij.plugin.ui.actions.GenerateTestsAction.update(GenerateTestsAction.kt:19)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.lambda$performDumbAwareUpdate$0(ActionUtil.java:150)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.performDumbAwareUpdate(ActionUtil.java:173)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.doUpdate(ActionUpdater.java:660)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$updateActionReal$4(ActionUpdater.java:128)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$computeOnEdt$6(ActionUpdater.java:211)
	at com.intellij.openapi.progress.ProgressManager.lambda$runProcess$0(ProgressManager.java:66)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:188)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$12(CoreProgressManager.java:608)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:683)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:639)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:607)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:60)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:175)
	at com.intellij.openapi.progress.ProgressManager.runProcess(ProgressManager.java:66)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$computeOnEdt$7(ActionUpdater.java:207)
	at com.intellij.openapi.actionSystem.impl.ActionUpdateEdtExecutor.lambda$computeOnEdt$0(ActionUpdateEdtExecutor.java:45)
	at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:194)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:881)
	at com.intellij.openapi.application.impl.ApplicationImpl$3.run(ApplicationImpl.java:513)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:75)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:118)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:42)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:779)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:730)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:724)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:749)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:918)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:766)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:450)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:791)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:449)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:113)
	at com.intellij.ide.IdeEventQueue.performActivity(IdeEventQueue.java:624)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:447)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:881)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:493)
	at com.intellij.openapi.actionSystem.impl.Utils.lambda$expandActionGroupImpl$3(Utils.java:235)
	at com.intellij.openapi.actionSystem.impl.Utils.runLoopAndWaitForFuture(Utils.java:778)
	at com.intellij.openapi.actionSystem.impl.Utils.expandActionGroupImpl(Utils.java:233)
	at com.intellij.openapi.actionSystem.impl.Utils.lambda$fillMenu$6(Utils.java:317)
	at com.intellij.openapi.actionSystem.impl.Utils.computeWithRetries(Utils.java:808)
	at com.intellij.openapi.actionSystem.impl.Utils.fillMenu(Utils.java:316)
	at com.intellij.openapi.actionSystem.impl.ActionPopupMenuImpl$MyMenu.lambda$updateChildren$2(ActionPopupMenuImpl.java:172)
	at com.intellij.util.TimeoutUtil.run(TimeoutUtil.java:59)
	at com.intellij.openapi.actionSystem.impl.ActionPopupMenuImpl$MyMenu.updateChildren(ActionPopupMenuImpl.java:171)
	at com.intellij.openapi.actionSystem.impl.ActionPopupMenuImpl$MyMenu.show(ActionPopupMenuImpl.java:123)
	at com.intellij.ui.PopupHandler$2.invokePopup(PopupHandler.java:142)
	at com.intellij.ui.PopupHandler.mouseReleased(PopupHandler.java:55)
	at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:298)
	at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297)
	at java.desktop/java.awt.Component.processMouseEvent(Component.java:6648)
	at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3392)
	at com.intellij.ui.treeStructure.Tree.processMouseEvent(Tree.java:422)
	at com.intellij.ide.dnd.aware.DnDAwareTree.processMouseEvent(DnDAwareTree.java:44)
	at java.desktop/java.awt.Component.processEvent(Component.java:6413)
	at java.desktop/java.awt.Container.processEvent(Container.java:2266)
	at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5022)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4854)
	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4948)
	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4575)
	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4516)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2310)
	at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2802)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4854)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:781)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:730)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:724)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:754)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:752)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:751)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:918)
	at com.intellij.ide.IdeEventQueue.dispatchMouseEvent(IdeEventQueue.java:840)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:763)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:450)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:791)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:449)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:113)
	at com.intellij.ide.IdeEventQueue.performActivity(IdeEventQueue.java:624)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:447)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:881)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:493)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)
Caused by: java.lang.ClassNotFoundException: com.jetbrains.python.psi.PyFile PluginClassLoader(plugin=PluginDescriptor(name=UnitTestBot, id=org.utbot.intellij.plugin.id, descriptorPath=plugin.xml, path=~\AppData\Roaming\JetBrains\IntelliJIdea2022.2\plugins\utbot-intellij, version=2023.2.764., package=null, isBundled=false), packagePrefix=null, instanceId=369, state=active)
	at com.intellij.ide.plugins.cl.PluginClassLoader.loadClass(PluginClassLoader.java:214)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
	... 99 more

Environment

Windows 10 Pro
IntelliJ IDEA Ultimate 2022.2.4

Additional context

Reproducing after Python plugin is installed without IDE restart.
Doesn't reproduce after IDE was restarted.