CodeAction: Index out of bounds

[Eskibear]

Java Model Exception: Error in Java Model (code 980): Index out of bounds
	at org.eclipse.jdt.internal.core.Openable.codeSelect(Openable.java:162)
	at org.eclipse.jdt.internal.core.CompilationUnit.codeSelect(CompilationUnit.java:389)
	at org.eclipse.jdt.internal.core.CompilationUnit.codeSelect(CompilationUnit.java:382)
	at org.eclipse.jdt.ls.core.internal.JDTUtils.findElementsAtSelection(JDTUtils.java:977)
	at org.eclipse.jdt.ls.core.internal.JDTUtils.findElementAtSelection(JDTUtils.java:958)
	at org.eclipse.jdt.ls.core.internal.text.correction.SourceAssistProcessor.getSourceActionCommands(SourceAssistProcessor.java:111)
	at org.eclipse.jdt.ls.core.internal.handlers.CodeActionHandler.getCodeActionCommands(CodeActionHandler.java:210)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$15(JDTLanguageServer.java:648)

[github-actions]

Hi @Eskibear, I'm an AI Support assistant here to help with your issue. While the team reviews your request, I wanted to provide some possible tips and documentation that might help you in the meantime.

The Index out of bounds in CodeActionHandler.getCodeActionCommands is a known JDT-LS issue when it can’t resolve the AST node at the current selection. No direct workaround exists in the extension; you can track progress or try a different JDK:

• Use Java 11 (set java.jdt.ls.java.home to a JDK 11 installation) instead of JDK 16+ (many users report fewer code‐selection errors).
• Ensure you’re on the latest VS Code Java Extension Pack (which includes the newest JDT-LS).

High‐confidence references:

• Issue #1935 (“Autocomplete doesn’t work” – identical stack inside findElementsAtSelection → getSourceActionCommands):
redhat-developer/vscode-java#1935
• Eclipse JDT LS #340 (“Problem resolving code lens Index out of bounds” – similar codeSelect OOB in JDTUtils):
eclipse-jdtls/eclipse.jdt.ls#340

Other references with low confidence

• VS Code Java #4080 (OOB in QuickAssist proposals, similar symptoms but different code path):
redhat-developer/vscode-java#4080

The team will respond to your issue shortly. I hope these suggestions are helpful in the meantime. If this comment helped you, please give it a 👍. If the suggestion was not helpful or incorrect, please give it a 👎. Your feedback helps us improve!

[Eskibear]

closing this as AI is bullshitting.