Unable to start Metals.

[zhuchenglllll]

When I try to start the Metals plugin in VS Code on Windows 11, I encounter the following errors:

Metals version: 1.6.1
Using coursier located at C:\Users\朱c.metals\cs.exe
openjdk version "17.0.14" 2025-01-21
OpenJDK Runtime Environment JBR-17.0.14+1-1367.22-nomod (build 17.0.14+1-b1367.22)
OpenJDK 64-Bit Server VM JBR-17.0.14+1-1367.22-nomod (build 17.0.14+1-b1367.22, mixed mode, sharing)
Using Java Home: C:\Program Files\Java\jdk-17

Error: Could not find or load main class scala.meta.metals.Main
Caused by: java.lang.ClassNotFoundException: scala.meta.metals.Main

[Error - 3:37:32 PM] Server initialization failed.
Message: Pending response rejected since connection got disposed
Code: -32097

[Info - 3:37:32 PM] Connection to server got closed. Server will restart.
true

[Error - 3:37:32 PM] Metals client: couldn't create connection to server.
Message: Pending response rejected since connection got disposed
Code: -32097

[Error - 3:37:32 PM] Server process exited with code 1.
Error: Could not find or load main class scala.meta.metals.Main
Caused by: java.lang.ClassNotFoundException: scala.meta.metals.Main

[Error - 3:37:32 PM] Server process exited with code 1.
[Error - 3:37:32 PM] Server initialization failed.
Message: Pending response rejected since connection got disposed
Code: -32097

[Info - 3:37:32 PM] Connection to server got closed. Server will restart.
true

[Error - 3:37:32 PM] Metals client: couldn't create connection to server.
Message: Pending response rejected since connection got disposed
Code: -32097

Could not launch Metals Language Server:
Pending response rejected since connection got disposed

Release notes was not shown: not showing release notes since they've already been seen for your current version

Error: Could not find or load main class scala.meta.metals.Main
Caused by: java.lang.ClassNotFoundException: scala.meta.metals.Main

[Error - 3:37:32 PM] Server initialization failed.
Message: Pending response rejected since connection got disposed
Code: -32097

[Info - 3:37:32 PM] Connection to server got closed. Server will restart.
true

[Error - 3:37:32 PM] Metals client: couldn't create connection to server.
Message: Pending response rejected since connection got disposed
Code: -32097

[Error - 3:37:32 PM] Restarting server failed
Message: Pending response rejected since connection got disposed
Code: -32097

[Error - 3:37:32 PM] Server process exited with code 1.
Error: Could not find or load main class scala.meta.metals.Main
Caused by: java.lang.ClassNotFoundException: scala.meta.metals.Main

[Error - 3:37:33 PM] Server process exited with code 1.
[Error - 3:37:33 PM] Server initialization failed.
Message: Pending response rejected since connection got disposed
Code: -32097

[Info - 3:37:33 PM] Connection to server got closed. Server will restart.
true

[Error - 3:37:33 PM] Metals client: couldn't create connection to server.
Message: Pending response rejected since connection got disposed
Code: -32097

[Error - 3:37:33 PM] Restarting server failed
Message: Pending response rejected since connection got disposed
Code: -32097

[Error - 3:37:33 PM] Server process exited with code 1.
Error: Could not find or load main class scala.meta.metals.Main
Caused by: java.lang.ClassNotFoundException: scala.meta.metals.Main

[Error - 3:37:33 PM] Server initialization failed.
Message: Pending response rejected since connection got disposed
Code: -32097

[Error - 3:37:33 PM] The Metals server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.

[Error - 3:37:33 PM] Metals client: couldn't create connection to server.
Message: Pending response rejected since connection got disposed
Code: -32097

[Error - 3:37:33 PM] Restarting server failed
Message: Pending response rejected since connection got disposed
Code: -32097

[tgodzik]

Thanks for reporting! Do you maybe set any special options in your project or environment? Or something like .jvmopts files or JAVA_OPTS env variable? It looks like the invocation is not working properly, I wonder if it's because of 朱 character, but I have never seen issues with non ASCII characters

[zhuchenglllll]

In my case, this character is normal, so it shouldn't be because of the character. I haven't set the JAVA_OPTS environment variable either. The project is a demo built with sbt.
ERROR.txt

[tgodzik]

We now print the exact arguments metals uses to connect in #1736

You would need to add -Dmetals.loglevel=debug to metals.serverProperties and enable prereleases for the extension. You can then try and run the exact command to see which part is breaking for us to fix it.

[zhuchenglllll]

I have already updated the Metals extension to version 1.54, and I've added the following to my VS Code user settings.json:

"metals.serverProperties": [
  "-Dmetals.loglevel=debug"
]

However, the error messages remain unchanged.
[

Ҳ ޷ scala.meta.meta.txt

](url)

[tgodzik]

Could set the version of the extension to prerelease? We could see the exact command being run this way.