Unhandled exception while starting IntelliJ

[nail2001]

It did not happen before 0.20 (if I remember well)

Every time I start IntelliJ I get this exception:

To reindex this file IDEA has to be restarted: com.intellij.openapi.fileTypes.impl.AbstractFileType cannot be cast to com.intellij.openapi.fileTypes.LanguageFileType
java.lang.ClassCastException: com.intellij.openapi.fileTypes.impl.AbstractFileType cannot be cast to com.intellij.openapi.fileTypes.LanguageFileType
at com.intellij.util.indexing.FileContentImpl.createFileFromText(FileContentImpl.java:97)
at com.intellij.util.indexing.FileContentImpl.getPsiFile(FileContentImpl.java:75)
at org.zalando.intellij.swagger.index.SwaggerDataIndexer.map(SwaggerDataIndexer.java:34)
at org.zalando.intellij.swagger.index.SwaggerDataIndexer.map(SwaggerDataIndexer.java:25)
at com.intellij.util.indexing.MapReduceIndex.update(MapReduceIndex.java:457)
at com.intellij.util.indexing.FileBasedIndexImpl.updateSingleIndex(FileBasedIndexImpl.java:1633)
at com.intellij.util.indexing.FileBasedIndexImpl.lambda$doIndexFileContent$8(FileBasedIndexImpl.java:1559)
at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.freezeFileTypeTemporarilyIn(FileTypeManagerImpl.java:505)
at com.intellij.util.indexing.FileBasedIndexImpl.doIndexFileContent(FileBasedIndexImpl.java:1516)
at com.intellij.util.indexing.FileBasedIndexImpl.indexFileContent(FileBasedIndexImpl.java:1501)
at com.intellij.util.indexing.UnindexedFilesUpdater.lambda$indexFiles$0(UnindexedFilesUpdater.java:107)
at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.lambda$run$0(CacheUpdateRunner.java:219)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1026)
at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.lambda$run$1(CacheUpdateRunner.java:236)
at com.intellij.openapi.progress.impl.CoreProgressManager$3.run(CoreProgressManager.java:170)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:494)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:443)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:155)
at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.run(CacheUpdateRunner.java:232)
at com.intellij.openapi.application.impl.ApplicationImpl$2.run(ApplicationImpl.java:307)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

[semonte]

I will take a look at this. Are you able to share your project so that I could test this with your setup?

[nail2001]

I was unable to reproduce the error myself on a different computer. Therefore I made a clean install of intellij and the problem is gone now.

[semonte]

Ok, please let me know if the problem reappears. I have not heard of a similar issue before, so it does not make sense to invest time in this for now.