You are viewing the documentation for the 2.5.0 release in the 2.5.x series of releases. The latest stable release series is 3.0.x.

§Play 2.5 Migration Guide

This is a guide for migrating from Play 2.4 to Play 2.5. If you need to migrate from an earlier version of Play then you must first follow the Play 2.4 Migration Guide.

As well as the information contained on this page, there is more detailed migration information for some topics:

§sbt upgrade to 0.13.11

Although Play 2.5 will still work with sbt 0.13.8, we recommend upgrading to the latest sbt version, 0.13.11. The 0.13.11 release of sbt has a number of improvements and bug fixes.

§How to migrate

Update your project/ so that it reads:


§Scala 2.10 support discontinued

Play 2.3 and 2.4 supported both Scala 2.10 and 2.11. Play 2.5 has dropped support for Scala 2.10 and now only supports Scala 2.11. There are a couple of reasons for this:

  1. Play 2.5’s internal code makes extensive use of the scala-java8-compat library, which only supports Scala 2.11. The scala-java8-compat has conversions between many Scala and Java 8 types, such as Scala Futures and Java CompletionStages. (You might find this library useful for your code too.)

  2. The next version of Play will probably add support for Scala 2.12. It’s time for Play to move to Scala 2.11 so that the upcoming transition to 2.12 will be easier.

§How to migrate

Both Scala and Java users must configure sbt to use Scala 2.11. Even if you have no Scala code in your project, Play itself uses Scala and must be configured to use the right Scala libraries.

To set the Scala version in sbt, simply set the scalaVersion key, eg:

scalaVersion := "2.11.7"

If you have a single project build, then this setting can just be placed on its own line in build.sbt. However, if you have a multi project build, then the scala version setting must be set on each project. Typically, in a multi project build, you will have some common settings shared by every project, this is the best place to put the setting, eg:

def common = Seq(
  scalaVersion := "2.11.7"

lazy val projectA = (project in file("projectA"))
  .settings(common: _*)

lazy val projectB = (project in file("projectB"))
  .settings(common: _*)

§Change to Logback configuration

As part of the change to remove Play’s hardcoded dependency on Logback (see Highlights), one of the classes used by Logback configuration had to be moved to another package.

§How to migrate

You will need to update your Logback configuration files (logback*.xml) and change any references to the old play.api.Logger$ColoredLevel to the new play.api.libs.logback.ColoredLevel class.

The new configuration after the change will look something like this:

<conversionRule conversionWord="coloredLevel" converterClass="play.api.libs.logback.ColoredLevel" />

You can find more details on how to set up Play with different logging frameworks are in Configuring logging section of the documentation.

§Play WS upgrades to AsyncHttpClient 2

Play WS has been upgraded to use AsyncHttpClient 2. This is a major upgrade that uses Netty 4.0. Most of the changes in AHC 2.0 are under the hood, but AHC has some significant refactorings which require breaking changes to the WS API:

In addition, there are number of small changes:

§Deprecated GlobalSettings

As part of the on going efforts to move away from global state in Play, GlobalSettings and the application Global object have been deprecated. For more details, see the Play 2.4 migration guide for how to migrate away from using GlobalSettings.

§Removed Plugins API

The Plugins API was deprecated in Play 2.4 and has been removed in Play 2.5. The Plugins API has been superseded by Play’s dependency injection and module system which provides a cleaner and more flexible way to build reusable components. For details on how to migrate from plugins to dependency injection see the Play 2.4 migration guide.

§Routes generated with InjectedRoutesGenerator

Routes are now generated using the dependency injection aware InjectedRoutesGenerator, rather than the previous StaticRoutesGenerator which assumed controllers were singleton objects.

To revert back to the earlier behavior (if you have “object MyController” in your code, for example), please add:

routesGenerator := StaticRoutesGenerator

to your build.sbt file.

Using static controllers with the static routes generator is not deprecated, but it is recommended that you migrate to using classes with dependency injection.

§Replaced static controllers with dependency injection

controllers.ExternalAssets is now a class, and has no static equivalent. controllers.Assets and controllers.Default are also classes, and while static equivalents exist, it is recommended that you use the class version.

§How to migrate

The recommended solution is to use classes for all your controllers. The InjectedRoutesGenerator is now the default, so the controllers in the routes file are assumed to be classes instead of objects.

If you still have static controllers, you can use StaticRoutesGenerator (described above) and add the @ symbol in front of the route in the routes file, e.g.

GET  /assets/*file = "/public", file)

§Deprecated play.Play and play.api.Play methods

The following methods have been deprecated in play.Play:

Likewise, methods in play.api.Play that take an implicit Application and delegate to Application, such as def classloader(implicit app: Application) are now deprecated.

§How to migrate

These methods delegate to either play.Application or play.Environment – code that uses them should use dependency injection to inject the relevant class.

You should refer to the list of dependency injected components in the Play 2.4 Migration Guide to migrate built-in Play components.

For example, the following code injects an environment and configuration into a Controller in Scala:

class HomeController @Inject() (environment: play.api.Environment, configuration: play.api.Configuration) extends Controller {

  def index = Action {
    Ok(views.html.index("Your new application is ready."))

  def config = Action {

  def count = Action {
    val num = environment.resource("application.conf").toSeq.size

§Handling legacy components

Generally the components you use should not need to depend on the entire application, but sometimes you have to deal with legacy components that require one. You can handle this by injecting the application into one of your components:

class FooController @Inject() (appProvider: Provider[Application]) extends Controller {
  implicit lazy val app = appProvider.get()
  def bar = Action {

Note that you usually want to use a Provider[Application] in this case to avoid circular dependencies.

Even better, you can make your own *Api class that turns the static methods into instance methods:

class FooApi @Inject() (appProvider: Provider[Application]) {
  implicit lazy val app = appProvider.get()
  def bar =
  def baz = Foo.baz(app)

This allows you to benefit from the testability you get with DI and still use your library that uses global state.

§Content-Type charset changes

Prior to Play 2.5, Play would add a charset parameter to certain content types that do not define a charset parameter, specifically application/json and application/x-www-form-urlencoded. Now the Content-Type is sent without a charset by default. This applies both to sending requests with WS and returning responses from Play actions. If you have a non-spec-compliant client or server that requires you to send a charset parameter, you can explicitly set the Content-Type header.

§Guice injector and Guice builder changes

By default, Guice can resolve your circular dependency by proxying an interface in the cycle. Since circular dependencies are generally a code smell, and you can also inject Providers to break the cycle, we have chosen to disable this feature on the default Guice injector. Other DI frameworks also are not likely to have this feature, so it can lead to problems when writing Play modules.

Now there are four new methods on the Guice builders (GuiceInjectorBuilder and GuiceApplicationBuilder) for customizing how Guice injects your classes:
* disableCircularProxies: disables the above-mentioned behaviour of proxying interfaces to resolve circular dependencies. To allow proxying use disableCircularProxies(false).
* requireExplicitBindings: instructs the injector to only inject classes that are explicitly bound in a module. Can be useful in testing for verifying bindings.
* requireAtInjectOnConstructors: requires a constructor annotated with @Inject to instantiate a class.
* requireExactBindingAnnotations: disables the error-prone feature in Guice where it can substitute a binding for @Named Foo when injecting @Named(“foo”) Foo.

§CSRF changes

In order to make Play’s CSRF filter more resilient to browser plugin vulnerabilities and new extensions, the default configuration for the CSRF filter has been made far more conservative. The changes include:

There’s a new config option to bypass the new CSRF protection for requests with certain headers. This config option is turned on by default for the Cookie and Authorization headers, so that REST clients, which typically don’t use session authentication, will still work without having to send a CSRF token.

However, since the config option allows through all requests without those headers, applications that use other authentication schemes (NTLM, TLS client certificates) will be vulnerable to CSRF. These applications should disable the config option so that their authenticated (cookieless) requests are protected by the CSRF filter.

Finally, an additional option has been added to disable the CSRF check for origins trusted by the CORS filter. Please note that the CORS filter must come before the CSRF filter in your filter chain for this to work!

Play’s old default behaviour can be restored by adding the following configuration to application.conf:

play.filters.csrf {
  header {
    bypassHeaders {
      X-Requested-With = "*"
      Csrf-Token = "nocheck"
    protectHeaders = null
  bypassCorsTrustedOrigins = false
  method {
    whiteList = []
    blackList = ["POST"]
  contentType.blackList = ["application/x-www-form-urlencoded", "multipart/form-data", "text/plain"]

§Getting the CSRF token

Previously, a CSRF token could be retrieved from the HTTP request in any action. Now you must have either a CSRF filter or a CSRF action for CRSF.getToken to work. If you’re not using a filter, you can use the CSRFAddToken action in Scala or AddCSRFToken Java annotation to ensure a token is in the session.

Also, a minor bug was fixed in this release in which the CSRF token would be empty (throwing an exception in the template helper) if its signature was invalid. Now it will be regenerated on the same request so a token is still available from the template helpers and CSRF.getToken.

For more details, please read the CSRF documentation for Java and Scala.

§Crypto Deprecated

From Play 1.x, Play has come with a Crypto object that provides some cryptographic operations. This used internally by Play. The Crypto object is not mentioned in the documentation, but is mentioned as “cryptographic utilities” in the scaladoc.

For a variety of reasons, providing cryptographic utilities as a convenience has turned out not to be workable. In 2.5.x, the Play-specific functionality has been broken into CookieSigner, CSRFTokenSigner and AESSigner traits, and the Crypto singleton object deprecated.

§How to Migrate

Cryptographic migration will depend on your use case, especially if there is unsafe construction of the cryptographic primitives. The short version is to use Kalium if possible, otherwise use KeyCzar or straight JCA.

Please see Crypto Migration for more details.

§Netty 4 upgrade

Netty has been upgraded from 3.10 to 4.0. One consequence of this is the configuration options for configuring Netty channel options have changed. The full list options can be seen here.

§How to Migrate

Modify any play.server.netty.option keys to use the new keys defined in ChannelOption. A mapping of some of the more popularly used ones is:

Old New
play.server.netty.option.backlog play.server.netty.option.SO_BACKLOG
play.server.netty.option.child.keepAlive play.server.netty.option.child.SO_KEEPALIVE
play.server.netty.option.child.tcpNoDelay play.server.netty.option.child.TCP_NODELAY

Next: Streams Migration Guide