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Last updated December 1, 2016

• Page 36, above Listing 2.7

  app/controllers/Application.conf

  should be

  app/controlers/Application.scala

• Page 37, under Listing 2.7

  The first thing you have to do in this setup is get an enumerator to work with. Iteratees are used to consume streams, whereas enumeratees produce them.

  should be

  The first thing you have to do in this setup is get an enumerator to work with. Iteratees are used to consume streams, whereas enumerators produce them.
              

• Page 84, under the curl command

  This should produce a 501 Not Implemented result (because you have a TODO action and no real implementation). 
  Then check out an invalid language

  should be

  This should produce a 501 Not Implemented result (because you have a TODO action and no real implementation).
  Then replace the TODO action with an action that returns Ok (Action { request => Ok }) and check out what happens with an invalid language.

Page 144, Listing 6.6

case class FetchFollowerCount(user: String)
case class FollowerCount(user: String, followersCount: Int)


should be

case class FetchFollowerCount(tweetId: BigInt, user: String)
case class FollowerCount(tweetId: BigInt, user: String, followersCount: Int)


• Page 169, "Creating and evolving the schema of a database"

  There needs to be an additional dependency in order to be able to run the evolutions:

  libraryDependencies ++= Seq(
    jdbc,
    "org.postgresql" % "postgresql" % "9.4-1201-jdbc41"
  )

  should be

  libraryDependencies ++= Seq(
    jdbc,
    evolutions,
    "org.postgresql" % "postgresql" % "9.4-1201-jdbc41"
  )

• Page 174, Listing 7.7

  val sql: DSLContext

  should be

  val context: DSLContext

• Page 188, Section 7.2.3 Writing the event stream with persistent actors

  The underlying idea of the CQRS model is to turn commands into events once they’ve been validated

  should be

  The underlying idea of the CQRS with Event Sourcing model is to turn commands into events once they’ve been validated

• Page 193, Exercise 7.2

  The exercise mentions the

  ClientConnectionHandler

  whereas this should be

  ClientCommandHandler