"sbt server is already booting." error when launching sbt from wsl2 ubuntu - sbt

Question

I've installed sbt using sdkman on wsl2 ubuntu setup. Currently sbt 1.4.2 is installed. When I try to launch it from the terminal it gives
sbt server is already booting. Create a new server? y/n (default y) if I choose n, nothing happens. If I choose y, then sbt starts. What I want to do is to be able to start sbt without that error message. Because this behaviour breaks metals on visual studio code.
I checked the sbt source code and found that the method below prints the error message - in sbt/main/src/main/scala/sbt/Main.scala
private def getSocketOrExit(
configuration: xsbti.AppConfiguration
): (Option[BootServerSocket], Option[Exit]) =
try (Some(new BootServerSocket(configuration)) -> None)
catch {
case _: ServerAlreadyBootingException
if System.console != null && !ITerminal.startedByRemoteClient =>
println("sbt server is already booting. Create a new server? y/n (default y)")
val exit = ITerminal.get.withRawInput(System.in.read) match {
case 110 => Some(Exit(1))
case _ => None
}
(None, exit)
case _: ServerAlreadyBootingException =>
if (SysProp.forceServerStart) (None, None)
else (None, Some(Exit(2)))
}
}
So, calling new BootServerSocket(configuration) throws an exception. Exception source is the method below from BootServerSocket.java;
static ServerSocket newSocket(final String sock) throws ServerAlreadyBootingException {
ServerSocket socket = null;
String name = socketName(sock);
try {
if (!isWindows) Files.deleteIfExists(Paths.get(sock));
socket =
isWindows
? new Win32NamedPipeServerSocket(name, false, Win32SecurityLevel.OWNER_DACL)
: new UnixDomainServerSocket(name);
return socket;
} catch (final IOException e) {
throw new ServerAlreadyBootingException();
}
}
I checked the isWindows method and it returns false. So the new UnixDomainServerSocket(name) part is running. And somehow it can't create a unix domain server socket. That's all I found out. Is there a way to fix this? Or is this a bug?

Answer 1

After moving my project files to a directory within wsl2, problem is solved. My project files were in a Windows directory before.