bug: Formatter fails when lombok imports are present #413
Description
Did you check docs and existing issues?
- I have read all the plugin docs
- I have searched the existing issues
- I have searched the existing issues of plugins related to this issue
Neovim version (nvim -v)
v0.12.0-dev
Operating system/version
Ubuntu 24.04.2 LTS
Describe the bug
Trying to format some of the Java files fails with errors like:
[ERROR][2025-08-10 16:27:23] ...p/_transport.lua:36 "rpc" "java" "stderr" "Aug 10, 2025 4:27:23 PM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint fallbackResponseError
SEVERE: Internal error: java.lang.IndexOutOfBoundsException: Index -1 out of bounds for length 64
java.util.concurrent.CompletionException: java.lang.IndexOutOfBoundsException: Index -1 out of bounds for length 64
\tat java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
\tat java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)
\tat java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:649)
\tat java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483)
\tat java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
\tat java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
\tat java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
\tat java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
\tat java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
Caused by: java.lang.IndexOutOfBoundsException: Index -1 out of bounds for length 64
\tat java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:100)
\tat java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:106)
\tat java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:302)
\tat java.base/java.util.Objects.checkIndex(Objects.java:385)
\tat java.base/java.util.ArrayList.get(ArrayList.java:427)
\tat org.eclipse.jdt.internal.formatter.TokenManager.get(TokenManager.java:78)
\tat org.eclipse.jdt.internal.formatter.TokenManager.findIndex(TokenManager.java:172)
\tat org.eclipse.jdt.internal.formatter.TokenManager.lastIndexIn(TokenManager.java:205)
\tat org.eclipse.jdt.internal.formatter.LineBreaksPreparator.handleBracedCode(LineBreaksPreparator.java:664)
\tat org.eclipse.jdt.internal.formatter.LineBreaksPreparator.visit(LineBreaksPreparator.java:229)
\tat org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:652)
\tat org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:3312)
\tat org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:3383)
\tat org.eclipse.jdt.core.dom.TypeDeclaration.accept0(TypeDeclaration.java:497)
\tat org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:3312)
\tat org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:3383)
\tat org.eclipse.jdt.core.dom.CompilationUnit.accept0(CompilationUnit.java:257)
\tat org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:3312)
\tat org.eclipse.jdt.internal.formatter.DefaultCodeFormatter.prepareLineBreaks(DefaultCodeFormatter.java:418)
\tat org.eclipse.jdt.internal.formatter.DefaultCodeFormatter.prepareFormattedCode(DefaultCodeFormatter.java:229)
\tat org.eclipse.jdt.internal.formatter.DefaultCodeFormatter.format(DefaultCodeFormatter.java:185)
\tat org.eclipse.jdt.internal.formatter.DefaultCodeFormatter.format(DefaultCodeFormatter.java:169)
\tat org.eclipse.jdt.ls.core.internal.handlers.FormatterHandler.format(FormatterHandler.java:120)
\tat org.eclipse.jdt.ls.core.internal.handlers.FormatterHandler.format(FormatterHandler.java:107)
\tat org.eclipse.jdt.ls.core.internal.handlers.FormatterHandler.formatting(FormatterHandler.java:78)
\tat org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$19(JDTLanguageServer.java:840)
\tat org.eclipse.jdt.ls.core.internal.BaseJDTLanguageServer.lambda$0(BaseJDTLanguageServer.java:87)
\tat java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646)
\t... 6 more"
Removing/commenting parts of the code I've figured out that if I delete/comment lombok imports formatting starts working again.
Steps To Reproduce
I've created minimum reproducible example, using Spring Initializr: DemoApplication.java.
With import lombok.AllArgsConstructor; trying to format this file produces error above for me. When I comment this line - formatting works again.
Expected Behavior
Java files are formatted without an error. The same file formatting works in VS Code, so I assume this is not an issue with a language server itself (maybe an issue with server version though).