Warning: node.js detection failed, sbt will use the Rhino based Trireme JavaScript engine

Question

I\'m new to Play framework. Please explain the meaning of the below warning.

Warning: node.js detection failed, sbt will use the Rhino based Trireme J

Answer 1

in Windows 10:

Install node.js from https://nodejs.org/en/ (The installer automatically adds node.js to your PATH)

then add:

export SBT_OPTS="$SBT_OPTS -Dsbt.jse.engineType=Node"

to your plugins.sbt in

. ./project/plugins.sbt

Worked for me - the warning has disappeared!

EDIT: Apparently plugins.sbt was the wrong place to add the

export SBT_OPTS="$SBT_OPTS -Dsbt.jse.engineType=Node"

...although the warning disappeared when loading my app, it led to an error when relaunching the app a couple of hours later:

error: not found: value export

I would be glad if anyone could help and tell me where to put the export.