Request textDocument/definition failed - CodeQL 2.21.0 seems to break Language Server integration

[kevinvandervlist]

After upgrading to the latest release 2.21.0, I noticed that none of the 'Go To Definition' actions seem to work anymore.

After checking the logs, it looks like the update to this version caused this somewhere in the language server that is used from the VSCode plugin

Apr 03, 2025 9:07:05 PM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint fallbackResponseError
SEVERE: Internal error: java.lang.NullPointerException: Cannot invoke "com.semmle.frontend.ast.ASTNode.getPosition()" because "node" is null
java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke "com.semmle.frontend.ast.ASTNode.getPosition()" because "node" is null
	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException: Cannot invoke "com.semmle.frontend.ast.ASTNode.getPosition()" because "node" is null
	at com.semmle.frontend.search.EditorPositionTransformer$EditorPositionNodeFinder.process(EditorPositionTransformer.java:129)
	at com.semmle.frontend.search.EditorPositionTransformer$EditorPositionNodeFinder.visit(EditorPositionTransformer.java:243)
	at com.semmle.frontend.search.EditorPositionTransformer.transform(EditorPositionTransformer.java:70)
	at com.semmle.frontend.search.DefinitionPositionTransformer.transform(DefinitionPositionTransformer.java:20)
	at com.semmle.frontend.project.QlLspImplementations.definition(QlLspImplementations.java:153)
	at com.semmle.frontend.server.QLLanguageServer$QLTextDocumentService.lambda$definition$2(QLLanguageServer.java:394)
	... 4 more

Content-Length: 1565

{"jsonrpc":"2.0","id":45,"error":{"code":-32603,"message":"Internal error.","data":"java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke \"com.semmle.frontend.ast.ASTNode.getPosition()\" because \"node\" is null\n\tat java.base/java.util.concurrent.CompletableFuture.encodeThrowable(Unknown Source)\n\tat java.base/java.util.concurrent.CompletableFuture.completeThrowable(Unknown Source)\n\tat java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(Unknown Source)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)\n\tat java.base/java.lang.Thread.run(Unknown Source)\nCaused by: java.lang.NullPointerException: Cannot invoke \"com.semmle.frontend.ast.ASTNode.getPosition()\" because \"node\" is null\n\tat com.semmle.frontend.search.EditorPositionTransformer$EditorPositionNodeFinder.process(EditorPositionTransformer.java:129)\n\tat com.semmle.frontend.search.EditorPositionTransformer$EditorPositionNodeFinder.visit(EditorPositionTransformer.java:243)\n\tat com.semmle.frontend.search.EditorPositionTransformer.transform(EditorPositionTransformer.java:70)\n\tat com.semmle.frontend.search.DefinitionPositionTransformer.transform(DefinitionPositionTransformer.java:20)\n\tat com.semmle.frontend.project.QlLspImplementations.definition(QlLspImplementations.java:153)\n\tat com.semmle.frontend.server.QLLanguageServer$QLTextDocumentService.lambda$definition$2(QLLanguageServer.java:394)\n\t... 4 more\n"}}[Error - 21:07:05] Request textDocument/definition failed.
  Message: Internal error.
  Code: -32603 
java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke "com.semmle.frontend.ast.ASTNode.getPosition()" because "node" is null
	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException: Cannot invoke "com.semmle.frontend.ast.ASTNode.getPosition()" because "node" is null
	at com.semmle.frontend.search.EditorPositionTransformer$EditorPositionNodeFinder.process(EditorPositionTransformer.java:129)
	at com.semmle.frontend.search.EditorPositionTransformer$EditorPositionNodeFinder.visit(EditorPositionTransformer.java:243)
	at com.semmle.frontend.search.EditorPositionTransformer.transform(EditorPositionTransformer.java:70)
	at com.semmle.frontend.search.DefinitionPositionTransformer.transform(DefinitionPositionTransformer.java:20)
	at com.semmle.frontend.project.QlLspImplementations.definition(QlLspImplementations.java:153)
	at com.semmle.frontend.server.QLLanguageServer$QLTextDocumentService.lambda$definition$2(QLLanguageServer.java:394)
	... 4 more

[jketema]

Hi @kevinvandervlist,

This clearly should not happen. Have you tried restarting VSCode, or slightly modifying the file with the module you want to jump to?

[kevinvandervlist]

Hi @jketema,

Actually, I did -- at least 2 times. I also think I modified the files, but I'm not 100% sure anymore.

I did however shut down the machine and called it a day. Now everything works as expected but no caches and running processes anymore ;)

So I don't know what exactly happened, but I cannot reproduce it (anymore).

[jketema]

Thanks for reporting back!