[BUG] Bounds check (Intellij plugin)
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?
Version: 2.1.109 (Claude Code)
Source: Claude itself ...
Proper fix (for Anthropic to address)
The plugin needs a bounds check in DiagnosticTools.kt before calling getLineNumber:
val docLen = document.textLength
if (highlight.startOffset in 0 until docLen) {
val line = document.getLineNumber(highlight.startOffset)
// ...
}
What Should Happen?
No exception when it runs
Error Messages/Logs
Your plugin for Intellij throws an exception. How can we fix that? java.lang.IndexOutOfBoundsException: Wrong offset: 3313104. Should be in range: [0, 392356]
at com.intellij.openapi.editor.impl.LineSet.findLineIndex(LineSet.java:167)
at com.intellij.openapi.editor.impl.DocumentImpl.getLineNumber(DocumentImpl.java:1050)
at com.anthropic.code.plugin.mcp.tools.DiagnosticTools$addTools$1$1$1.daemonFinished$lambda$0(DiagnosticTools.kt:124)
at com.anthropic.code.plugin.mcp.tools.DiagnosticTools$addTools$1$1$1.daemonFinished$lambda$1(DiagnosticTools.kt:118)
at com.intellij.codeInsight.daemon.impl.DaemonCodeAnalyzerEx.lambda$processHighlights$0(DaemonCodeAnalyzerEx.java:83)
at com.intellij.openapi.editor.impl.MarkupModelImpl.processRangeHighlightersOverlappingWith(MarkupModelImpl.java:285)
at com.intellij.codeInsight.daemon.impl.DaemonCodeAnalyzerEx.processHighlights(DaemonCodeAnalyzerEx.java:76)
at com.intellij.codeInsight.daemon.impl.DaemonCodeAnalyzerEx.processHighlights(DaemonCodeAnalyzerEx.java:62)
at com.intellij.codeInsight.daemon.impl.DaemonCodeAnalyzerEx.processHighlights(DaemonCodeAnalyzerEx.java:49)
at com.anthropic.code.plugin.mcp.tools.DiagnosticTools$addTools$1$1$1.daemonFinished(DiagnosticTools.kt:112)
at com.intellij.codeInsight.daemon.DaemonCodeAnalyzer$DaemonListener.daemonFinished(DaemonCodeAnalyzer.java:98)
at com.intellij.util.messages.impl.MessageBusImplKt.invokeMethod(MessageBusImpl.kt:818)
at com.intellij.util.messages.impl.MessageBusImplKt.invokeListener(MessageBusImpl.kt:762)
at com.intellij.util.messages.impl.MessageBusImplKt.executeOrAddToQueue(MessageBusImpl.kt:583)
at com.intellij.util.messages.impl.MessagePublisher.publish$intellij_platform_core(MessageBusImpl.kt:554)
at com.intellij.util.messages.impl.MessagePublisher.invoke(MessageBusImpl.kt:531)
at jdk.proxy2/jdk.proxy2.$Proxy91.daemonFinished(Unknown Source)
at com.intellij.codeInsight.daemon.impl.DaemonCodeAnalyzerImpl$MyDaemonProgressIndicator.onStop(DaemonCodeAnalyzerImpl.java:1649)
at com.intellij.codeInsight.daemon.impl.DaemonProgressIndicator.stop(DaemonProgressIndicator.java:39)
at com.intellij.codeInsight.daemon.impl.PassExecutorService.lambda$applyInformationToEditorsLater$3(PassExecutorService.java:554)
at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:240)
at com.intellij.openapi.application.TransactionGuardImpl.access$100(TransactionGuardImpl.java:26)
at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:202)
at com.intellij.openapi.application.impl.AppImplKt$runnableUnitFunction$1.invoke(appImpl.kt:104)
at com.intellij.openapi.application.impl.AppImplKt$runnableUnitFunction$1.invoke(appImpl.kt:104)
at com.intellij.platform.locking.impl.NestedLocksThreadingSupport.doRunWriteIntentReadAction(NestedLocksThreadingSupport.kt:666)
at com.intellij.platform.locking.impl.NestedLocksThreadingSupport.runPreventiveWriteIntentReadAction(NestedLocksThreadingSupport.kt:640)
at com.intellij.platform.locking.impl.NestedLocksThreadingSupport.runWriteIntentReadAction(NestedLocksThreadingSupport.kt:633)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:1022)
at com.intellij.openapi.application.impl.ApplicationImpl$6.run(ApplicationImpl.java:574)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:167)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:167)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:173)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:167)
at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:27)
at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:122)
at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:43)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:781)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:728)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:750)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:595)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:488)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12$lambda$11$lambda$10$lambda$9(IdeEventQueue.kt:313)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:865)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12$lambda$11$lambda$10(IdeEventQueue.kt:312)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$3(IdeEventQueue.kt:974)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:110)
at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:974)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12(IdeEventQueue.kt:307)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:347)
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
The exception is in DiagnosticTools.kt:124. The daemon finishes analyzing the file, then calls document.getLineNumber(3313104) — but the document only has 392,356 bytes at that point. The offset is ~8× larger than the current document size.
The cause: you opened unified_runner_output.log in the IDE. The backend is actively writing to it. The sequence is:
- IntelliJ daemon runs on the file when it is ~3.3 MB
- The log file keeps growing (or IntelliJ reloads it mid-flight, or truncation happened)
- By the time the daemon calls getLineNumber(highlight.startOffset) the document has been replaced with a smaller version (392 KB)
- The stale offset is now out of range → IndexOutOfBoundsException
This is a real bug in the plugin (no bounds check before getLineNumber), but you can work around it immediately:
Claude Model
Sonnet (default)
Is this a regression?
Yes, this worked in a previous version
Last Working Version
_No response_
Claude Code Version
2.1.109
Platform
Anthropic API
Operating System
Ubuntu/Debian Linux
Terminal/Shell
IntelliJ IDEA terminal
Additional Information
_No response_
This issue has 1 comment on GitHub. Read the full discussion on GitHub ↗