How to generate a new application.secret in Play 2.x

in play 2.4 use

activator playGenerateSecret

run

sbt play-generate-secret

or

sbt play-update-secret

if you want to update an existing secret in application.conf

More info here https://www.playframework.com/documentation/2.3.2/ApplicationSecret

You are right. I think this feature is not yet implemented in 2.x version. I am afraid the only way to do is to create a new project. Each new project will generate a new secret key. And then copy only the newly generated key.

I think this issue was raised for your problem: https://github.com/n8han/giter8/issues/42 referenced in https://groups.google.com/forum/#!topic/play-framework/aMyM_fDglSs

Good luck.

EDIT 2020-01-23:

It would appear that they went back to camel-case, so on current versions of Play w/ SBT it should be

sbt playGenerateSecret

EDIT 2015-05-11:

As noted by @myk this is now implemented in the sbt plugin, you need to run:

sbt play-generate-secret

or

sbt play-update-secret

Edit 2015-07-02

Using activator:

activator playGenerateSecret

This is how you can do it in Scala console:

$ scala

scala> val r = new java.security.SecureRandom
r: java.security.SecureRandom = java.security.SecureRandom@b4ca6f6

scala> (1 to 64).map(_=>(r.nextInt(74)+48).toChar).mkString.replaceAll("\\\\+", "/")
res4: String = cCU`liU?i^R3f:Tk3ekG9a0^hjtwADUi@X2OtjAqKG`vv/>dk@cq_QOnu47WQ<0_

Your secret is key now is:

cCU`liU?i^R3f:Tk3ekG9a0^hjtwADUi@X2OtjAqKG`vv/>dk@cq_QOnu47WQ<0_