⁉️Common Errors

Here you will find a list of common errors and their solutions.

Error "no space left on device" shuts the server down

What happens

• The console prints:

  [jfr,system] Failed to write to jfr stream because no space left on device

• Java is trying to save Java Flight Recorder (JFR) files inside the container’s temporary directory. That tmp filesystem is very small; once it fills up, the JVM exits for safety.

The 30‑second fix

1. Go to Startup → JVM Startup Flags / Arguments in your panel.

2. Add this flag exactly as shown, anywhere in the list:

   -XX:-FlightRecorder -Djdk.jfr.disabled=true
   
   For versions prior to Java 11:
   
   -XX:+UnlockCommercialFeatures -XX:-FlightRecorder -Djdk.jfr.disabled=true
   
   If it still doesn't work then add this:
   
   -XX:-FlightRecorder -Djava.io.tmpdir=/home/container/tmp_jfr

3. Save the changes and restart the server.

Disabling JFR stops the .jfr files from being written, so the "no space left on device" error disappears.

Usually the cause of this is the Spark plugin/mod, if the problem persists, simply remove it.

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Do I lose anything by turning JFR off?

No. Gameplay and mods continue exactly the same; you only lose an advanced diagnostic recording that most people never use.