Exception: "Read access is allowed from event dispatch thread or inside read-action only"

[windmueller]

After using checkstyle from the commit dialog in IDEA 14.1, I received this exception:

Read access is allowed from event dispatch thread or inside read-action only (see com.intellij.openapi.application.Application.runReadAction())
Details: Current thread: Thread[ApplicationImpl pooled thread 39,4,main] 1294714407
; dispatch thread: false; isDispatchThread(): false
SystemEventQueueThread: Thread[AWT-EventQueue-0 14.1#IU-141.177.4, eap:false,6,main] 1096794837
java.lang.Throwable
    at com.intellij.openapi.diagnostic.Logger.error(Logger.java:126)
    at com.intellij.openapi.application.impl.ApplicationImpl.assertReadAccessAllowed(ApplicationImpl.java:982)
    at com.intellij.psi.impl.file.impl.FileManagerImpl.findFile(FileManagerImpl.java:375)
    at com.intellij.psi.impl.PsiManagerImpl.findFile(PsiManagerImpl.java:184)
    at org.infernus.idea.checkstyle.checker.AbstractCheckerThread$1.visitFile(AbstractCheckerThread.java:109)
    at com.intellij.openapi.vfs.VirtualFileVisitor.visitFileEx(VirtualFileVisitor.java:132)
    at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:264)
    at org.infernus.idea.checkstyle.checker.AbstractCheckerThread.buildFilesList(AbstractCheckerThread.java:105)
    at org.infernus.idea.checkstyle.checker.AbstractCheckerThread.<init>(AbstractCheckerThread.java:47)
    at org.infernus.idea.checkstyle.checker.ScanFilesThread.<init>(ScanFilesThread.java:35)
    at org.infernus.idea.checkstyle.CheckStylePlugin.scanFiles(CheckStylePlugin.java:198)
    at org.infernus.idea.checkstyle.handlers.ScanFilesBeforeCheckinHandler$2.run(ScanFilesBeforeCheckinHandler.java:98)
    at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:563)
    at com.intellij.openapi.progress.impl.CoreProgressManager$8.run(CoreProgressManager.java:367)
    at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:152)
    at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:452)
    at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
    at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:137)
    at com.intellij.openapi.application.impl.ApplicationImpl$10$1.run(ApplicationImpl.java:623)
    at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:405)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
    at org.jetbrains.ide.PooledThreadExecutor$1$1.run(PooledThreadExecutor.java:56)

[jshiell]

Thanks for the report. I've wrapped this in a readAction, so it should be fixed as of 4.14.1.