[scala 2.5.0] Crypto deprecation - play.crypto.secret not found

[Andy Czerwonka]

I've taken on a migration to 2.5.0, and while I read that Crypto is deprecated, I'd argue it's now broken. I managed to move over most of my global state (GlobalSettings, Configuration, etc) to the DI framework. Now when I run my application, I do get warnings that Crypto is deprecated so I was going to start on that. Prior to and change in that area, I now have a problem in that 2.5.0 can't find 'play.crypto.secret', which is clearly there in the application.conf.

[error] - akka.actor.OneForOneStrategy - No configuration setting found for key 'play.crypto.secret'

com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'play.crypto.secret'

at com.typesafe.config.impl.SimpleConfig.findKeyOrNull(SimpleConfig.java:152)

at com.typesafe.config.impl.SimpleConfig.findOrNull(SimpleConfig.java:170)

at com.typesafe.config.impl.SimpleConfig.findOrNull(SimpleConfig.java:176)

at com.typesafe.config.impl.SimpleConfig.findOrNull(SimpleConfig.java:176)

at com.typesafe.config.impl.SimpleConfig.findOrNull(SimpleConfig.java:193)

at com.typesafe.config.impl.SimpleConfig.findOrNull(SimpleConfig.java:198)

at com.typesafe.config.impl.SimpleConfig.getIsNull(SimpleConfig.java:208)

at play.api.ConfigLoader$$anon$4.load(Configuration.scala:1075)

at play.api.ConfigLoader$$anon$4.load(Configuration.scala:1073)

at play.api.PlayConfig.get(Configuration.scala:916)

at play.api.PlayConfig$$anonfun$getDeprecated$2.apply(Configuration.scala:960)

at scala.Option.getOrElse(Option.scala:121)

at play.api.PlayConfig.getDeprecated(Configuration.scala:959)

at play.api.libs.crypto.CryptoConfigParser.get$lzycompute(Crypto.scala:494)

at play.api.libs.crypto.CryptoConfigParser.get(Crypto.scala:465)

at play.api.libs.Crypto$$anonfun$crypto$1.apply(Crypto.scala:58)

at play.api.libs.Crypto$$anonfun$crypto$1.apply(Crypto.scala:55)

at scala.Option.fold(Option.scala:158)

at play.api.libs.Crypto$.crypto(Crypto.scala:63)

at play.api.libs.Crypto$.decryptAES(Crypto.scala:86)

at models.Site$.findByApiKey(Site.scala:146)

[Andy Czerwonka]

If anyone is curious, I put a small project together to demonstrate the issue.

https://github.com/andyczerwonka/crypto-akka-exception

[Greg Methvin]

Hi Andy,

The problem is that the application isn't started yet at that point. Actually the specific exception you're getting is misleading. We really should just throw an exception if there is no application in scope, but instead we try to create a Crypto instance, which fails because there's no configuration. So technically there is a bug but even if we fixed it it wouldn't work.

I would suggest creating the actor with dependency injection, or simply passing a Crypto instance to that actor when you create it. It would also probably work to set an initial delay in the scheduler to make sure the application is initialized, but that is not really a robust solution.

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Greg Methvin

Senior Software Engineer

Lightbend, Inc.