IDE Internal Error

[alexkrapf]

IntelliJ IDEA 2023.3.1 (Ultimate Edition)
Build #IU-233.11799.300, built on December 12, 2023
Runtime version: 17.0.9+7-b1087.7 aarch64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
macOS 14.1.2
GC: G1 Young Generation, G1 Old Generation
Memory: 4096M
Cores: 12
Metal Rendering is ON
Registry:
ide.experimental.ui=true
Non-Bundled Plugins:
com.github.oowekyala.javacc (1.12.1)
Kotlin: 233.11799.300-IJ

I just finished installing all my tools on a new Mac (M2). Latest version of IntelliJ, latest OS, latest Java 21, latest everything. The plugin managed to compile the existing JavaCC file (which works fine on an older Intel Mac with an older 2022.X. version of IDEA) but the IDE keeps complaining:

java.lang.Throwable: Assertion failed: Element(JCC_GRAMMAR_FILE_ROOT)
	at com.intellij.openapi.diagnostic.Logger.assertTrue(Logger.java:469)
	at com.intellij.psi.impl.source.tree.CompositeElement.getChildrenAsPsiElements(CompositeElement.java:395)
	at com.intellij.psi.impl.source.PsiFileImpl.getChildren(PsiFileImpl.java:733)
	at com.intellij.psi.impl.source.PsiFileImpl.findChildByClass(PsiFileImpl.java:545)
	at com.github.oowekyala.ijcc.lang.psi.impl.JccFileImpl.getGrammarFileRoot(JccFileImpl.kt:34)
	at com.github.oowekyala.ijcc.lang.psi.impl.JccFileImpl.getOptions(JccFileImpl.kt:77)
	at com.github.oowekyala.ijcc.lang.model.InlineGrammarOptions.getOptionValueOrDefault(InlineGrammarOptions.kt:74)
	at com.github.oowekyala.ijcc.lang.model.InlineGrammarOptions.access$getOptionValueOrDefault(InlineGrammarOptions.kt:15)
	at com.github.oowekyala.ijcc.lang.model.InlineGrammarOptions$nodePrefix$2.invoke(InlineGrammarOptions.kt:67)
	at com.github.oowekyala.ijcc.lang.model.InlineGrammarOptions$nodePrefix$2.invoke(InlineGrammarOptions.kt:67)
	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
	at com.github.oowekyala.ijcc.lang.model.InlineGrammarOptions.getNodePrefix(InlineGrammarOptions.kt:67)
	at com.github.oowekyala.ijcc.lang.psi.stubs.JccFileStub$StubType$getBuilder$1.createStubForFile(StubImplementations.kt:53)
	at com.intellij.psi.stubs.DefaultStubBuilder.buildStubTree(DefaultStubBuilder.java:22)
	at com.intellij.psi.stubs.StubTreeBuilder.lambda$buildStubTree$1(StubTreeBuilder.java:142)
	at com.intellij.psi.stubs.StubTreeBuilder.handleStubBuilderException(StubTreeBuilder.java:98)
	at com.intellij.psi.stubs.StubTreeBuilder.lambda$buildStubTree$3(StubTreeBuilder.java:142)
	at com.intellij.psi.impl.PsiManagerImpl.runInBatchFilesMode(PsiManagerImpl.java:462)
	at com.intellij.psi.stubs.StubTreeBuilder.buildStubTree(StubTreeBuilder.java:132)
	at com.intellij.psi.stubs.StubUpdatingIndex$2.computeValue(StubUpdatingIndex.java:198)
	at com.intellij.psi.stubs.StubUpdatingIndex$2.computeValue(StubUpdatingIndex.java:176)
	at com.intellij.psi.stubs.StubUpdatingIndex$2.computeValue(StubUpdatingIndex.java:145)
	at com.intellij.util.indexing.SingleEntryIndexer.map(SingleEntryIndexer.java:30)
	at com.intellij.util.indexing.SingleEntryIndexer.map(SingleEntryIndexer.java:19)
	at com.intellij.util.indexing.impl.MapReduceIndex.mapByIndexer(MapReduceIndex.java:318)
	at com.intellij.util.indexing.impl.MapReduceIndex.mapInput(MapReduceIndex.java:309)
	at com.intellij.util.indexing.impl.MapReduceIndex.mapInputAndPrepareUpdate(MapReduceIndex.java:254)
	at com.intellij.psi.stubs.StubUpdatingIndexStorage.mapInputAndPrepareUpdate(StubUpdatingIndexStorage.java:61)
	at com.intellij.psi.stubs.StubUpdatingIndexStorage.mapInputAndPrepareUpdate(StubUpdatingIndexStorage.java:22)
	at com.intellij.indexing.composite.CompositeInvertedIndexBase.updateBaseIndex(CompositeInvertedIndexBase.java:284)
	at com.intellij.indexing.composite.CompositeInvertedIndexBase.mapInputAndPrepareUpdate(CompositeInvertedIndexBase.java:64)
	at com.intellij.indexing.composite.CompositeInvertedIndexBase.mapInputAndPrepareUpdate(CompositeInvertedIndexBase.java:30)
	at com.intellij.util.indexing.FileBasedIndexImpl.createSingleIndexValueApplier(FileBasedIndexImpl.java:1571)
	at com.intellij.util.indexing.FileBasedIndexImpl.lambda$doIndexFileContent$23(FileBasedIndexImpl.java:1444)
	at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.freezeFileTypeTemporarilyWithProvidedValueIn(FileTypeManagerImpl.java:678)
	at com.intellij.util.indexing.FileBasedIndexImpl.doIndexFileContent(FileBasedIndexImpl.java:1397)
	at com.intellij.util.indexing.FileBasedIndexImpl.indexFileContent(FileBasedIndexImpl.java:1371)
	at com.intellij.util.indexing.contentQueue.IndexUpdateRunner.lambda$indexOneFileOfJob$5(IndexUpdateRunner.java:492)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$OTelMonitor.callWrapped(NonBlockingReadActionImpl.java:840)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$OTelMonitor$MonitoredComputation.call(NonBlockingReadActionImpl.java:872)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.insideReadAction(NonBlockingReadActionImpl.java:604)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.lambda$attemptComputation$4(NonBlockingReadActionImpl.java:567)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1075)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$runInReadActionWithWriteActionPriority$0(ProgressIndicatorUtils.java:73)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtilService.runActionAndCancelBeforeWrite(ProgressIndicatorUtilService.java:73)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runActionAndCancelBeforeWrite(ProgressIndicatorUtils.java:128)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$runWithWriteActionPriority$1(ProgressIndicatorUtils.java:111)
	at com.intellij.openapi.progress.ProgressManager.lambda$runProcess$0(ProgressManager.java:73)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:192)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$12(CoreProgressManager.java:610)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:685)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:641)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:609)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:78)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:179)
	at com.intellij.openapi.progress.ProgressManager.runProcess(ProgressManager.java:73)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runWithWriteActionPriority(ProgressIndicatorUtils.java:108)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runInReadActionWithWriteActionPriority(ProgressIndicatorUtils.java:73)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.attemptComputation(NonBlockingReadActionImpl.java:567)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.executeSynchronously(NonBlockingReadActionImpl.java:492)
	at com.intellij.openapi.application.impl.NonBlockingReadActionImpl.executeSynchronously(NonBlockingReadActionImpl.java:220)
	at com.intellij.util.indexing.contentQueue.IndexUpdateRunner.indexOneFileOfJob(IndexUpdateRunner.java:496)
	at com.intellij.util.indexing.contentQueue.IndexUpdateRunner.lambda$indexJobsFairly$4(IndexUpdateRunner.java:375)
	at com.intellij.openapi.progress.impl.ProgressSuspender.executeNonSuspendableSection(ProgressSuspender.java:90)
	at com.intellij.util.indexing.contentQueue.IndexUpdateRunner.indexJobsFairly(IndexUpdateRunner.java:378)
	at com.intellij.util.indexing.contentQueue.IndexUpdateRunner.lambda$doIndexFiles$3(IndexUpdateRunner.java:309)
	at com.intellij.util.concurrency.BoundedTaskExecutor.doRun(BoundedTaskExecutor.java:244)
	at com.intellij.util.concurrency.BoundedTaskExecutor.access$200(BoundedTaskExecutor.java:30)
	at com.intellij.util.concurrency.BoundedTaskExecutor$1.executeFirstTaskAndHelpQueue(BoundedTaskExecutor.java:222)
	at com.intellij.util.ConcurrencyUtil.runUnderThreadName(ConcurrencyUtil.java:218)
	at com.intellij.util.concurrency.BoundedTaskExecutor$1.run(BoundedTaskExecutor.java:210)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:702)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:699)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:699)
	at java.base/java.lang.Thread.run(Thread.java:840)

[ITachiLab]

I'm observing the same issue.