[BUG] Exception "Slow Operations are prohibited" in Claude Code plugin for JetBrains IDEA
Open 💬 0 comments Opened Jul 1, 2026 by AceMcCloudxx
Preflight Checklist
- [x] I have searched existing issues and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code
What's Wrong?
Exception reported, see below
What Should Happen?
Claude should not throw any exceptions.
Error Messages/Logs
java.lang.Throwable: Slow operations are prohibited on EDT. See SlowOperations.assertSlowOperationsAreAllowed javadoc.
at com.intellij.openapi.diagnostic.Logger.error(Logger.java:378)
at com.intellij.util.SlowOperations.logError(SlowOperations.java:180)
at com.intellij.util.SlowOperations.assertSlowOperationsAreAllowed(SlowOperations.java:128)
at com.intellij.openapi.vfs.newvfs.persistent.FSRecordsImpl.update(FSRecordsImpl.java:790)
at com.intellij.openapi.vfs.newvfs.persistent.PersistentFSImpl.findChildInfo(PersistentFSImpl.java:854)
at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.findInPersistence(VirtualDirectoryImpl.java:243)
at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.findChildImpl(VirtualDirectoryImpl.java:221)
at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.findChild(VirtualDirectoryImpl.java:132)
at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.findChild(VirtualDirectoryImpl.java:670)
at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.findChild(VirtualDirectoryImpl.java:63)
at com.intellij.openapi.vfs.newvfs.FileNavigator$2.childOf(FileNavigator.java:85)
at com.intellij.openapi.vfs.newvfs.FileNavigator$2.childOf(FileNavigator.java:59)
at com.intellij.openapi.vfs.newvfs.FileNavigator.followPath(FileNavigator.java:138)
at com.intellij.openapi.vfs.newvfs.FileNavigator.lambda$navigate$0(FileNavigator.java:115)
at com.intellij.openapi.vfs.newvfs.FileNavigator.retryUpToN(FileNavigator.java:172)
at com.intellij.openapi.vfs.newvfs.FileNavigator.navigate(FileNavigator.java:114)
at com.intellij.openapi.vfs.newvfs.NewVirtualFileSystem.findFileByPath(NewVirtualFileSystem.java:344)
at com.intellij.openapi.vfs.impl.local.LocalFileSystemBase.findFileByPath(LocalFileSystemBase.java:89)
at com.anthropic.code.plugin.UtilsKt.openVirtualFileFromPath$lambda$0(Utils.kt:37)
at com.intellij.openapi.application.ActionsKt.runReadActionBlocking(actions.kt:47)
at com.intellij.openapi.application.ActionsKt.runReadAction(actions.kt:27)
at com.anthropic.code.plugin.UtilsKt.openVirtualFileFromPath(Utils.kt:36)
at com.anthropic.code.plugin.mcp.tools.DiagnosticTools$addTools$1.invokeSuspend$lambda$1(DiagnosticTools.kt:87)
at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:246)
at com.intellij.openapi.application.TransactionGuardImpl.access$100(TransactionGuardImpl.java:22)
at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:208)
at com.intellij.openapi.application.impl.ApplicationImpl$7.lambda$run$0(ApplicationImpl.java:655)
at com.intellij.concurrency.ThreadContext.installThreadContext(threadContext.kt:307)
at com.intellij.openapi.application.impl.ApplicationImpl$7.run(ApplicationImpl.java:650)
at com.intellij.openapi.application.impl.AppImplKt.rethrowExceptions$lambda$1(appImpl.kt:86)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:193)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:193)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:199)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:193)
at com.intellij.util.concurrency.ContextRunnable.lambda$run$0(ContextRunnable.java:26)
at com.intellij.concurrency.ThreadContext.resetThreadContext(threadContext.kt:295)
at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:25)
at com.intellij.openapi.application.impl.AppImplKt.rethrowExceptions$lambda$2(appImpl.kt:97)
at com.intellij.openapi.application.impl.LaterInvocator$1.run(LaterInvocator.java:141)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.runNextEvent$lambda$1$1$0(NonBlockingFlushQueue.kt:329)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:941)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.runNextEvent$lambda$1$1(NonBlockingFlushQueue.kt:328)
at com.intellij.concurrency.ThreadContext.resetThreadContext(threadContext.kt:295)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.runNextEvent$lambda$1(NonBlockingFlushQueue.kt:325)
at com.intellij.platform.locking.impl.NestedLocksThreadingSupport.tryRunWriteIntentReadAction(NestedLocksThreadingSupport.kt:753)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.runNextEvent(NonBlockingFlushQueue.kt:321)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.flushNow(NonBlockingFlushQueue.kt:299)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.FLUSH_NOW$lambda$0(NonBlockingFlushQueue.kt:158)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:323)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:732)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:711)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:731)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:584)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$0$0$0(IdeEventQueue.kt:384)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$0(IdeEventQueue.kt:1122)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:106)
at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:1122)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$0(IdeEventQueue.kt:382)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:422)
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)Steps to Reproduce
Hard to say where it came from or what the context was as I had multiple projects open and have been getting exceptions from other IDEA components.
Claude Model
Sonnet (default)
Is this a regression?
I don't know
Last Working Version
_No response_
Claude Code Version
2.1.197 (Claude Code)
Platform
Anthropic API
Operating System
macOS
Terminal/Shell
IntelliJ IDEA terminal
Additional Information
_No response_