react-nativegradlegradle-daemon

Gradle Daemon could not be reused


I am trying to run a react native project but I see an error saying "Starting a Gradle Daemon, 14 busy and 1 incompatible and 2 stopped Daemons could not be reused, use --status for details" after which the terminal stays idle.

Hello, I've followed the steps outlined in the official react native docs for starting a new react native project. Everything went perfect until I ran the react-native run-android command with an emulator open. I got the following error:

"Starting a Gradle Daemon, 14 busy and 1 incompatible and 2 stopped Daemons could not be reused, use --status for details"

And then the application stayed in "IDLE" state and I could not get the react native application to show on the emulator.

So far I have tried every existing solution proposal on every blog/article I could find but none of them worked.

  1. I have tried to stop all gradle processes using gradle --stop.
  2. I have tried to delete the .gradle dir.
  3. I have tried to delete the .gradle/5.4.1/daemon files but I could not even find a daemon folder inside the gradle version folder.
  4. I have tried multiple times deleting the project and creating a new one with react-native init.
  5. I have tried not updating the gradle software which is suggested when opening a new project inside android studio.
  6. I have tried using a different phone for the emulator.

terminal output - https://i.sstatic.net/cEnJG.jpg project folders - https://i.sstatic.net/eQ4JB.jpg


Solution

  • It's not an error, it's just a warning and your app started fine. The error means that there are no available cached Gradle processes (daemons) available. A Gradle daemon is available when it is:

    Some aspects of the requested build environment may not be met by an Daemon. If the Daemon is running with a Java 8 runtime, but the requested environment calls for Java 10, then the Daemon is not compatible and another must be started. Moreover, certain properties of a Java runtime cannot be changed once the JVM has started. For example, it is not possible to change the memory allocation (e.g. -Xmx1024m), default text encoding, default locale, etc of a running JVM.

    Read more in the docs.

    So your messages basically means that you have 14 occupied (non-idle) daemons and 2 non-compatible. Gradle just have to start a new daemon to execute your build!

    P.S. I recommend you to kill those 14 processes with gradle --stop as that seems to be to much. I guess you've just started your app 14 times!