Java Debugger error: "Failed to send request to lsp proxy failed to fetch ... 502 Bad Gateway"

[himicoswilson]

Relevance Confirmation

• I confirmed that this is not an issue with the Eclipse JDT Language Server itself

What happened?

Zed’s Java debugger fails with a 502 Bad Gateway error when trying to communicate with the internal LSP proxy.
This happens after opening a multi-module Java project (Maven-based) and attempting to start debugging or interacting with the Java Language Server (JDTLS).

The Java language server itself starts successfully, but once the debugger or related features trigger a proxy request, the following error appears in the logs and the debug panel fails to respond.

2025-11-09T13:50:18+08:00 INFO  [lsp] Language server with id 3 sent unhandled notification language/status:
{
  "type": "Message",
  "message": "Updating ruoyi-system configuration"
}
2025-11-09T13:50:18+08:00 INFO  [lsp] Language server with id 3 sent unhandled notification language/status:
{
  "type": "ProjectStatus",
  "message": "OK"
}
2025-11-09T13:50:18+08:00 INFO  [lsp] Language server with id 3 sent unhandled notification language/status:
{
  "type": "ProjectStatus",
  "message": "OK"
}
2025-11-09T13:50:18+08:00 INFO  [lsp] Language server with id 3 sent unhandled notification language/status:
{
  "type": "ProjectStatus",
  "message": "OK"
}
2025-11-09T13:50:22+08:00 ERROR [workspace::notifications] Showing error notification in app: Error: dev::ToggleInspector is only available in debug builds
2025-11-09T13:50:44+08:00 ERROR [debugger_ui::debugger_panel] "Failed to send request to lsp proxy failed to fetch 'http://localhost:64930': status code 502 Bad Gateway"

What did you expect to happen?

The debugger and Java LSP should communicate through the internal LSP proxy without errors.

Environment

Zed: 0.211.6
Platform: macOS 26.1
Java: 21.0.9