Error in custom provider, Configuration error: mimetype replaced by play.http.fileMimeTypes map

Play Framework
1

Hi experts,

Has anyone seen this exception?
I get it when I try to open the first page in our application - it initially starts up fine.
We are upgrading from Play 2.2 to Play 2.6 and there have been many difficulties…
Google searches came up empty.
The Play migration documentation says that the mimetypes change is under the hood and didn’t require any Java changes.
I have tried my own custom Module and ApplicationLoader and get the same error with or without them.

1) Error in custom provider, Configuration error: Configuration error[mimetype replaced by play.http.fileMimeTypes map]
  while locating play.api.http.HttpConfiguration$HttpConfigurationProvider
  while locating play.api.http.HttpConfiguration
    for the 1st parameter of play.api.http.HttpConfiguration$CookiesConfigurationProvider.<init>(HttpConfiguration.scala:293)
  at play.api.http.HttpConfiguration$CookiesConfigurationProvider.class(HttpConfiguration.scala:293)
  while locating play.api.http.HttpConfiguration$CookiesConfigurationProvider
  while locating play.api.http.CookiesConfiguration
    for the 1st parameter of play.api.mvc.DefaultCookieHeaderEncoding.<init>(Cookie.scala:325)
  while locating play.api.mvc.DefaultCookieHeaderEncoding
  while locating play.api.mvc.CookieHeaderEncoding
    for the 1st parameter of play.api.mvc.request.DefaultRequestFactory.<init>(RequestFactory.scala:90)
  while locating play.api.mvc.request.DefaultRequestFactory
  while locating play.api.mvc.request.RequestFactory
    for the 5th parameter of play.api.DefaultApplication.<init>(Application.scala:236)
  at play.api.DefaultApplication.class(Application.scala:235)
  while locating play.api.DefaultApplication
  while locating play.api.Application
Caused by: Configuration error: Configuration error[mimetype replaced by play.http.fileMimeTypes map]
	at play.api.Configuration$.configError(Configuration.scala:156)
	at play.api.Configuration.globalError(Configuration.scala:1007)
	at play.api.http.HttpConfiguration$.fromConfiguration(HttpConfiguration.scala:186)
	at play.api.http.HttpConfiguration$HttpConfigurationProvider.get$lzycompute(HttpConfiguration.scala:284)
	at play.api.http.HttpConfiguration$HttpConfigurationProvider.get(HttpConfiguration.scala:284)
	at play.api.http.HttpConfiguration$HttpConfigurationProvider.get(HttpConfiguration.scala:283)
	at com.google.inject.internal.ProviderInternalFactory.provision(ProviderInternalFactory.java:81)
	at com.google.inject.internal.BoundProviderFactory.provision(BoundProviderFactory.java:72)
	at com.google.inject.internal.ProviderInternalFactory.circularGet(ProviderInternalFactory.java:61)
	at com.google.inject.internal.BoundProviderFactory.get(BoundProviderFactory.java:62)
	at com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:38)
	at com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:62)
	at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:110)
	at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:90)
	at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:268)
	at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46)
	at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1092)
	at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
	at com.google.inject.internal.SingletonScope$1.get(SingletonScope.java:194)
	at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:41)
	at com.google.inject.internal.BoundProviderFactory.get(BoundProviderFactory.java:61)
	at com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:38)
	at com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:62)
	at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:110)
	at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:90)
	at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:268)
	at com.google.inject.internal.FactoryProxy.get(FactoryProxy.java:56)
	at com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:38)
	at com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:62)
	at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:110)
	at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:90)
	at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:268)
	at com.google.inject.internal.FactoryProxy.get(FactoryProxy.java:56)
	at com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:38)
	at com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:62)
	at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:110)
	at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:90)
	at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:268)
	at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46)
	at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1092)
	at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
	at com.google.inject.internal.SingletonScope$1.get(SingletonScope.java:194)
	at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:41)
	at com.google.inject.internal.FactoryProxy.get(FactoryProxy.java:56)
	at com.google.inject.internal.InjectorImpl$2$1.call(InjectorImpl.java:1019)
	at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1085)
	at com.google.inject.internal.InjectorImpl$2.get(InjectorImpl.java:1015)
	at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1054)
	at play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:409)
	at play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:404)
	at play.api.inject.ContextClassLoaderInjector$$anonfun$instanceOf$2.apply(Injector.scala:117)
	at play.api.inject.ContextClassLoaderInjector.withContext(Injector.scala:126)
	at play.api.inject.ContextClassLoaderInjector.instanceOf(Injector.scala:117)
	at play.api.inject.guice.GuiceApplicationBuilder.build(GuiceApplicationBuilder.scala:137)
	at play.api.inject.guice.GuiceApplicationLoader.load(GuiceApplicationLoader.scala:21)
	at play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$1.apply(DevServerStart.scala:174)
	at play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$1.apply(DevServerStart.scala:171)
	at play.utils.Threads$.withContextClassLoader(Threads.scala:21)
	at play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1.reload(DevServerStart.scala:171)
	at play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1.get(DevServerStart.scala:124)
	at play.core.server.AkkaHttpServer.play$core$server$AkkaHttpServer$$handleRequest(AkkaHttpServer.scala:222)
	at play.core.server.AkkaHttpServer$$anonfun$4.apply(AkkaHttpServer.scala:137)
	at play.core.server.AkkaHttpServer$$anonfun$4.apply(AkkaHttpServer.scala:137)
	at akka.stream.impl.fusing.MapAsync$$anon$25.onPush(Ops.scala:1194)
	at akka.stream.impl.fusing.GraphInterpreter.processPush(GraphInterpreter.scala:519)
	at akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:482)
	at akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:378)
	at akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:585)
	at akka.stream.impl.fusing.GraphInterpreterShell$AsyncInput.execute(ActorGraphInterpreter.scala:469)
	at akka.stream.impl.fusing.GraphInterpreterShell.processEvent(ActorGraphInterpreter.scala:560)
	at akka.stream.impl.fusing.ActorGraphInterpreter.akka$stream$impl$fusing$ActorGraphInterpreter$$processEvent(ActorGraphInterpreter.scala:742)
	at akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:757)
	at akka.actor.Actor$class.aroundReceive(Actor.scala:517)
	at akka.stream.impl.fusing.ActorGraphInterpreter.aroundReceive(ActorGraphInterpreter.scala:667)
	at akka.actor.ActorCell.receiveMessage(ActorCell.scala:590)
	at akka.actor.ActorCell.invoke(ActorCell.scala:559)
	at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
	at akka.dispatch.Mailbox.run(Mailbox.scala:224)
	at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
	at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
	at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
	at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
	at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
2

In 2.6 Play changed to a more flexible format for mapping file extensions to MIME types. From the 2.6 migration guide:

There is a syntax that allows configurations defined as mimetype.foo=text/bar for additional MIME types. This is deprecated, and you are encouraged to use the above configuration.

The wording here is actually a bit misleading, as this format is not just deprecated but forbidden in 2.6. The fix is to move to all your mimetype.* configuration keys to the new format. As described in the migration guide, this looks like:

play.http.fileMimeTypes = ${play.http.fileMimeTypes} """
  foo=text/bar
"""

You can add multiple MIME type mappings to match the previous mimetype.* settings, where each one is defined on its own line in the string. See the defaults in reference.conf.

You might also want to submit a pull request to improve the wording in the migration guide to help others fix this more easily in the future. The page to edit is https://github.com/playframework/playframework/blob/master/documentation/manual/releases/release26/migration26/Migration26.md.