Error:Execution failed for task ':backend:appengineStart'.

[ahmedmed7t]

com.google.cloud.tools.appengine.cloudsdk.internal.process.ProcessRunnerException: Process exited before success message

i get this error when i trying to run server

[luizlugo]

It seems that you have to add the java8 tag to the file appengine-web.xml inside backend module

[kulloveth]

@ahmedmed7t how did you solve this error because I'm currently in the middle of it

[kulloveth]

It seems that you have to add the java8 tag to the file appengine-web.xml inside backend module

true by adding <runtime>java8</runtime> solved it for me