Emulators start and suddenly shutting down

[REQUIRED] Environment info

firebase-tools: 9.16.0

Platform: macOS 11.4

[REQUIRED] Test case

I’ve 2 mac which 10.15.7 working fine but 11.4 refuse to start emulator.

[REQUIRED] Steps to reproduce

firebase emulators:start

[REQUIRED] Expected behavior

emulator start

[REQUIRED] Actual behavior

i  emulators: Starting emulators: functions, firestore
i  emulators: Shutting down emulators.
i  hub: Stopping emulator hub
:warning:  functions: Port 5001 is not open on localhost, could not start Functions Emulator.
:warning:  functions: To select a different host/port, specify that host/port in a firebase.json config file:
      {
        // ...
        "emulators": {
          "functions": {
            "host": "HOST",
            "port": "PORT"
          }
        }
      }
i  emulators: Shutting down emulators.

Error: Could not start Functions Emulator, port taken.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[galaxyblur]

Just experienced this on a new Mac and it would definitely help if this error (“Unable to locate a Java Runtime.”) was printed to the console instead. Additionally, I don’t see any mention of Java in the emulator docs.

[katopz]

I think so at first, so I try lsof -ti:5001 with no result. To make sure, I kill all related port I can think of. And even reboot and try again with no luck. Retry firebase init didn’t work either.

Anyway when I try change function port to 9991. I got

i  emulators: Starting emulators: functions, firestore
:warning:  functions: The following emulators are not running, calls to these services from the Functions emulator will affect production: auth, database, hosting, pubsub, storage
:heavy_check_mark:  functions: Using node@16 from host.
i  firestore: Firestore Emulator logging to firestore-debug.log
:warning:  firestore: Fatal error occurred: 
   Firestore Emulator has exited with code: 1, 
   stopping all running emulators
i  functions: Stopping Functions Emulator
i  firestore: Stopping Firestore Emulator
:warning:  firestore: Error stopping Firestore Emulator
i  hub: Stopping emulator hub

Which is fine because I’vefirestore-debug.log to investigate now and it said.

The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit http://www.java.com/ for information on installing Java.

Cool, This is new mac which I didn’t install java runtime yet so I install it and try again. And now it’s working!

But, I’m still curious about 5001 port which no one using it so I switch back to 5001 and try again… didn’t work! I’ve to stick with other port number then.

TLDR

• firestore-debug.log not create and emu shutting down when no java installed.
• port 5001 didn’t work for some reason even no one using it.
• Error detail seem incorrect about port taken?

I’ll leave issue open and let the team desire to close it as is or fix or investigate it somehow.

Thanks