NullPointerException in Jakarta EE Server Initialization

When clicking on variables in a Java project, an error occurs in the Jakarta EE server initialisation process. The error message indicates a NullPointerException during the execution of the org.eclipse.lsp4j.Diagnostic.getCode() method, specifically when trying to invoke org.eclipse.lsp4j.jsonrpc.messages.Either.getLeft(). As a result, the request textDocument/codeAction fails repeatedly, showing error code -32603. Additionally, in some cases, there are warnings for unmatched cancel notifications and errors indicating that the client is not running.

Environment

• Operating System: MacOS (Ventura 13.4)
• JDK version: temurin-11
• Visual Studio Code version: 1.80.1
• Java extension version: Latest at this time (1.20.0 I believe)

Steps To Reproduce

1. Build project, open file.
2. Click somewhere within the code.
3. See error.

Current Result

Expected Result

No errors.

Additional Informations

java-server.log

Start by reproducing the failure using the listed MacOS, JDK, VS Code, and Java extension environment, then inspect java-server.log. Trace the textDocument/codeAction path around org.eclipse.lsp4j.Diagnostic.getCode() and Either.getLeft(). Done means clicking in the Java project no longer produces the NullPointerException or repeated -32603 errors.