Code with sealed interfaces can not be formatted

[helmbold]

When trying to reformat code using the Google Java Format IntelliJ plugin, I get the following error:

Got unexpected exception during formatting PsiJavaFile:AccountCreationResult.java

java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: No enum constant javax.lang.model.element.Modifier.SEALED
	at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
	at com.intellij.codeInsight.actions.AbstractLayoutCodeProcessor$ProcessingTask.checkStop(AbstractLayoutCodeProcessor.java:439)
	at com.intellij.codeInsight.actions.AbstractLayoutCodeProcessor$ProcessingTask.performFileProcessing(AbstractLayoutCodeProcessor.java:433)
	at com.intellij.codeInsight.actions.AbstractLayoutCodeProcessor$1.run(AbstractLayoutCodeProcessor.java:282)
	at com.intellij.openapi.progress.impl.CoreProgressManager.startTask(CoreProgressManager.java:450)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.startTask(ProgressManagerImpl.java:117)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcessWithProgressAsync$5(CoreProgressManager.java:510)
	at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$3(ProgressRunner.java:243)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:183)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:705)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:647)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:63)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:170)
	at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$4(ProgressRunner.java:243)
	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.IllegalArgumentException: No enum constant javax.lang.model.element.Modifier.SEALED
	at java.base/java.lang.Enum.valueOf(Enum.java:240)
	at java.compiler@11.0.12/javax.lang.model.element.Modifier.valueOf(Modifier.java:47)
	at com.google.googlejavaformat.java.ModifierOrderer.asModifier(ModifierOrderer.java:151)
	at com.google.googlejavaformat.java.ModifierOrderer.reorderModifiers(ModifierOrderer.java:79)
	at com.google.googlejavaformat.java.Formatter.getFormatReplacements(Formatter.java:285)
	at com.google.googlejavaformat.intellij.FormatterUtil.getReplacements(FormatterUtil.java:40)
	at com.google.googlejavaformat.intellij.GoogleJavaFormatCodeStyleManager.format(GoogleJavaFormatCodeStyleManager.java:146)
	at com.google.googlejavaformat.intellij.GoogleJavaFormatCodeStyleManager.formatInternal(GoogleJavaFormatCodeStyleManager.java:133)
	at com.google.googlejavaformat.intellij.GoogleJavaFormatCodeStyleManager.reformatText(GoogleJavaFormatCodeStyleManager.java:69)
	at com.intellij.codeInsight.actions.ReformatCodeProcessor.lambda$prepareTask$0(ReformatCodeProcessor.java:129)
	at com.intellij.util.SlowOperations.allowSlowOperations(SlowOperations.java:152)
	at com.intellij.codeInsight.actions.ReformatCodeProcessor.lambda$prepareTask$1(ReformatCodeProcessor.java:119)
	at com.intellij.openapi.editor.ex.util.EditorScrollingPositionKeeper.perform(EditorScrollingPositionKeeper.java:100)
	at com.intellij.codeInsight.actions.ReformatCodeProcessor.lambda$prepareTask$2(ReformatCodeProcessor.java:119)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at com.intellij.codeInsight.actions.AbstractLayoutCodeProcessor$ProcessingTask.lambda$performFileProcessing$5(AbstractLayoutCodeProcessor.java:430)
	at com.intellij.openapi.command.WriteCommandAction$BuilderImpl.lambda$doRunWriteCommandAction$1(WriteCommandAction.java:143)
	at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:936)
	at com.intellij.openapi.command.WriteCommandAction$BuilderImpl.lambda$doRunWriteCommandAction$2(WriteCommandAction.java:141)
	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:216)
	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:182)
	at com.intellij.openapi.command.WriteCommandAction$BuilderImpl.doRunWriteCommandAction(WriteCommandAction.java:150)
	at com.intellij.openapi.command.WriteCommandAction$BuilderImpl.run(WriteCommandAction.java:117)
	at com.intellij.codeInsight.actions.AbstractLayoutCodeProcessor$ProcessingTask.lambda$performFileProcessing$6(AbstractLayoutCodeProcessor.java:430)
	at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:214)
	at com.intellij.openapi.application.TransactionGuardImpl.access$200(TransactionGuardImpl.java:21)
	at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:196)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:794)
	at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeAndWait$7(ApplicationImpl.java:451)
	at com.intellij.openapi.application.impl.LaterInvocator$1.run(LaterInvocator.java:134)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:84)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:133)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:46)
	at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:189)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:885)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:754)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:441)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:825)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:440)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:794)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:486)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[cushon]

Caused by: java.lang.IllegalArgumentException: No enum constant javax.lang.model.element.Modifier.SEALED
	at java.base/java.lang.Enum.valueOf(Enum.java:240)
	at java.compiler@11.0.12/javax.lang.model.element.Modifier.valueOf(Modifier.java:47)

The stack trace indicates that JDK 11 is being used here. google-java-format supports sealed, but only when running on newer JDKs that support the feature. Sealed classes were previewed in 15 and added in 17, so running on JDK 15 or newer should allow formatting sealed to work.

[helmbold]

You're right, the formatter itself was running on JDK 11 because that is the version IntelliJ runs on. While JetBrains provides JDK 17 for IntelliJ I wasn't able to start the IDE following this configuration approach. It looks like I have to wait for a future IntelliJ release running on JDK 17 out of the box to use the Java Formatter with Java 17.

Since JetBrains is very conservative with using new JDKs to run IntelliJ on, I don't expect the Google Java Formatter working properly with Java 17 code before autumn 2023 (two years after release of JDK 17, the update to JDK 11 was also two years after release).

[kevinb9n]

Relationship to #533?

[plumpy]

IntelliJ 2022.3 includes Java 17. So upgrading to that should fix this issue. Please leave a comment if it doesn't.