I use Fedora 22 OS and I'm trying to get started with Play! Framework. Naturally, I'm trying to build the simplest application possible so I can have a starting point. 

I tried to follow the guide at the documentation (<https://www.playframework.com/documentation/2.4.x/NewApplication>) as close as I could, but I'm getting no success here. It fails when I call the activator inside the base folder of the project and indicates me some unresolved dependencies. I'll post the steps I've taken so I can show what I've done and the problem as clearly as possible, including some information about Java (I read somewhere I should use Oracle Java instead of OpenJDK, so I downloaded the latest Java SE JDK 7) and sbt, which I belive to be related to the process.
My OS is in portuguese, so a few lines will be in portuguese, but as they refer to well known commands (basically the command alternatives), I don't think it will harm the comprehension.

```
su -

[root@localhost ~]# alternatives --config java

Há 3 programas que oferecem "java".

  Seleção    Comando
-----------------------------------------------
*+ 1           /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.45-36.b13.fc22.x86_64/jre/bin/java
   2           /usr/java/jdk1.7.0_79/bin/java
   3           /usr/java/default/jre/bin/java

Indique para manter a seleção atual[+] ou digite o número da seleção: 2

[root@localhost ~]# alternatives --config javac

Há 1 programa que oferece "javac".

  Seleção    Comando
-----------------------------------------------
*+ 1           /usr/java/default/bin/javac

[root@localhost ~]# alternatives --config javaws

Há 1 programa que oferece "javaws".

  Seleção    Comando
-----------------------------------------------
*+ 1           /usr/java/default/jre/bin/javaws

Indique para manter a seleção atual[+] ou digite o número da seleção: 1  

[root@localhost ~]# alternatives --config jar

Há 1 programa que oferece "jar".

  Seleção    Comando
-----------------------------------------------
*+ 1           /usr/java/default/bin/jar

Indique para manter a seleção atual[+] ou digite o número da seleção: 1

[root@localhost ~]# exit
logout

[gscofano@localhost new-project]$ java -version
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)

[gscofano@localhost new-project]$ javac -version
javac 1.7.0_79

[gscofano@localhost new-project]$ pwd 
/home/gscofano/Documentos/Programacao/play/play-2.4.2

[gscofano@localhost new-project]$ ls
activator-1.3.5-minimal

[gscofano@localhost new-project]$ mkdir new-project

[gscofano@localhost new-project]$ cd ./new-project

[gscofano@localhost new-project]$ sbt about

[info] Set current project to new-project (in build file:/home/gscofano/Documentos/Programacao/play/play-2.4.2/new-project/)
[info] This is sbt 0.13.1
[info] The current project is {file:/home/gscofano/Documentos/Programacao/play/play-2.4.2/new-project/}new-project 0.1-SNAPSHOT
[info] The current project is built against Scala 2.10.4
[info] 
[info] sbt, sbt plugins, and build definitions are using Scala 2.10.4

[gscofano@localhost new-project]$ ../activator-1.3.5-minimal/activator new first-app play-java

OK, application "first-app" is being created using the "play-java" template.

To run "first-app" from the command line, "cd first-app" then:
/home/gscofano/Documentos/Programacao/play/play-2.4.2/new-project/first-app/activator run

To run the test for "first-app" from the command line, "cd first-app" then:
/home/gscofano/Documentos/Programacao/play/play-2.4.2/new-project/first-app/activator test

To run the Activator UI for "first-app" from the command line, "cd first-app" then:
/home/gscofano/Documentos/Programacao/play/play-2.4.2/new-project/first-app/activator ui

[gscofano@localhost new-project]$ cd ./first-app

[gscofano@localhost first-app]$ ./activator
[info] Loading project definition from /home/gscofano/Documentos/Programacao/play/play-2.4.2/new-project/first-app/project
[info] Updating {file:/home/gscofano/Documentos/Programacao/play/play-2.4.2/new-project/first-app/project/}first-app-build...
[info] Resolving org.scala-sbt#precompiled-2_9_3;0.13.8 ...
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn]  ::          UNRESOLVED DEPENDENCIES         ::
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn]  :: org.scala-lang#scala-library;2.10.4: configuration not found in org.scala-lang#scala-library;2.10.4: 'master(compile)'. Missing configuration: 'compile'. It was required from com.typesafe#npm_2.10;1.1.1 compile
[warn]  :: org.scala-lang#scala-compiler;2.10.4: configuration not found in org.scala-lang#scala-compiler;2.10.4: 'master(compile)'. Missing configuration: 'compile'. It was required from com.typesafe.play#twirl-compiler_2.10;1.1.1 compile
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn] 
[warn]  Note: Unresolved dependencies path:
[warn]      org.scala-lang:scala-library:2.10.4 ((sbt.Classpaths) Defaults.scala#L1203)
[warn]        +- org.scala-sbt:control:0.13.8
[warn]        +- org.scala-sbt:io:0.13.8
[warn]        +- org.scala-sbt:classpath:0.13.8
[warn]        +- org.scala-sbt:incremental-compiler:0.13.8
[warn]        +- org.scala-sbt:persist:0.13.8
[warn]        +- org.scala-sbt:compiler-integration:0.13.8
[warn]        +- org.scala-sbt:actions:0.13.8
[warn]        +- org.scala-sbt:main:0.13.8
[warn]        +- org.scala-sbt:sbt:0.13.8
[warn]        +- default:first-app-build:0.1-SNAPSHOT (sbtVersion=0.13, scalaVersion=2.10)
[warn]      org.scala-lang:scala-compiler:2.10.4
[warn]        +- org.scala-sbt:classpath:0.13.8
[warn]        +- org.scala-sbt:incremental-compiler:0.13.8
[warn]        +- org.scala-sbt:persist:0.13.8
[warn]        +- org.scala-sbt:compiler-integration:0.13.8
[warn]        +- org.scala-sbt:actions:0.13.8
[warn]        +- org.scala-sbt:main:0.13.8
[warn]        +- org.scala-sbt:sbt:0.13.8
[warn]        +- default:first-app-build:0.1-SNAPSHOT (sbtVersion=0.13, scalaVersion=2.10)
sbt.ResolveException: unresolved dependency: org.scala-lang#scala-library;2.10.4: configuration not found in org.scala-lang#scala-library;2.10.4: 'master(compile)'. Missing configuration: 'compile'. It was required from com.typesafe#npm_2.10;1.1.1 compile
unresolved dependency: org.scala-lang#scala-compiler;2.10.4: configuration not found in org.scala-lang#scala-compiler;2.10.4: 'master(compile)'. Missing configuration: 'compile'. It was required from com.typesafe.play#twirl-compiler_2.10;1.1.1 compile
    at sbt.IvyActions$.sbt$IvyActions$$resolve(IvyActions.scala:291)
    at sbt.IvyActions$$anonfun$updateEither$1.apply(IvyActions.scala:188)
    at sbt.IvyActions$$anonfun$updateEither$1.apply(IvyActions.scala:165)
    at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:155)
    at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:155)
    at sbt.IvySbt$$anonfun$withIvy$1.apply(Ivy.scala:132)
    at sbt.IvySbt.sbt$IvySbt$$action$1(Ivy.scala:57)
    at sbt.IvySbt$$anon$4.call(Ivy.scala:65)
    at xsbt.boot.Locks$GlobalLock.withChannel$1(Locks.scala:93)
    at xsbt.boot.Locks$GlobalLock.xsbt$boot$Locks$GlobalLock$$withChannelRetries$1(Locks.scala:78)
    at xsbt.boot.Locks$GlobalLock$$anonfun$withFileLock$1.apply(Locks.scala:97)
    at xsbt.boot.Using$.withResource(Using.scala:10)
    at xsbt.boot.Using$.apply(Using.scala:9)
    at xsbt.boot.Locks$GlobalLock.ignoringDeadlockAvoided(Locks.scala:58)
    at xsbt.boot.Locks$GlobalLock.withLock(Locks.scala:48)
    at xsbt.boot.Locks$.apply0(Locks.scala:31)
    at xsbt.boot.Locks$.apply(Locks.scala:28)
    at sbt.IvySbt.withDefaultLogger(Ivy.scala:65)
    at sbt.IvySbt.withIvy(Ivy.scala:127)
    at sbt.IvySbt.withIvy(Ivy.scala:124)
    at sbt.IvySbt$Module.withModule(Ivy.scala:155)
    at sbt.IvyActions$.updateEither(IvyActions.scala:165)
    at sbt.Classpaths$$anonfun$sbt$Classpaths$$work$1$1.apply(Defaults.scala:1369)
    at sbt.Classpaths$$anonfun$sbt$Classpaths$$work$1$1.apply(Defaults.scala:1365)
    at sbt.Classpaths$$anonfun$doWork$1$1$$anonfun$87.apply(Defaults.scala:1399)
    at sbt.Classpaths$$anonfun$doWork$1$1$$anonfun$87.apply(Defaults.scala:1397)
    at sbt.Tracked$$anonfun$lastOutput$1.apply(Tracked.scala:37)
    at sbt.Classpaths$$anonfun$doWork$1$1.apply(Defaults.scala:1402)
    at sbt.Classpaths$$anonfun$doWork$1$1.apply(Defaults.scala:1396)
    at sbt.Tracked$$anonfun$inputChanged$1.apply(Tracked.scala:60)
    at sbt.Classpaths$.cachedUpdate(Defaults.scala:1419)
    at sbt.Classpaths$$anonfun$updateTask$1.apply(Defaults.scala:1348)
    at sbt.Classpaths$$anonfun$updateTask$1.apply(Defaults.scala:1310)
    at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
    at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
    at sbt.std.Transform$$anon$4.work(System.scala:63)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
    at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
    at sbt.Execute.work(Execute.scala:235)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
    at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
    at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
[error] (*:update) sbt.ResolveException: unresolved dependency: org.scala-lang#scala-library;2.10.4: configuration not found in org.scala-lang#scala-library;2.10.4: 'master(compile)'. Missing configuration: 'compile'. It was required from com.typesafe#npm_2.10;1.1.1 compile
[error] unresolved dependency: org.scala-lang#scala-compiler;2.10.4: configuration not found in org.scala-lang#scala-compiler;2.10.4: 'master(compile)'. Missing configuration: 'compile'. It was required from com.typesafe.play#twirl-compiler_2.10;1.1.1 compile
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore?

```

Here is build.sbt

```
name := """first-app"""

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayJava)

scalaVersion := "2.11.6"

libraryDependencies ++= Seq(
  javaJdbc,
  cache,
  javaWs
)

// Play provides two styles of routers, one expects its actions to be injected, the
// other, legacy style, accesses its actions statically.
routesGenerator := InjectedRoutesGenerator

```

build properties

```
#Activator-generated Properties
#Sat Aug 01 03:30:20 BRT 2015
template.uuid=4908845b-9453-410b-af0f-404c1440dff1
sbt.version=0.13.8

```

And plugins.sbt

```
// The Play plugin
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.4.2")

// Web plugins
addSbtPlugin("com.typesafe.sbt" % "sbt-coffeescript" % "1.0.0")
addSbtPlugin("com.typesafe.sbt" % "sbt-less" % "1.0.6")
addSbtPlugin("com.typesafe.sbt" % "sbt-jshint" % "1.0.3")
addSbtPlugin("com.typesafe.sbt" % "sbt-rjs" % "1.0.7")
addSbtPlugin("com.typesafe.sbt" % "sbt-digest" % "1.1.0")
addSbtPlugin("com.typesafe.sbt" % "sbt-mocha" % "1.1.0")

// Play enhancer - this automatically generates getters/setters for public fields
// and rewrites accessors of these fields to use the getters/setters. Remove this
// plugin if you prefer not to have this feature, or disable on a per project
// basis using disablePlugins(PlayEnhancer) in your build.sbt
addSbtPlugin("com.typesafe.sbt" % "sbt-play-enhancer" % "1.1.0")

// Play Ebean support, to enable, uncomment this line, and enable in your build.sbt using
// enablePlugins(SbtEbean). Note, uncommenting this line will automatically bring in
// Play enhancer, regardless of whether the line above is commented out or not.
// addSbtPlugin("com.typesafe.sbt" % "sbt-play-ebean" % "1.0.0")

```

I tried to separate the lines in this last file with blank lines. Nothing changes.

I tried to google this, but I couldn't find anything like. I'd appreciate very much if somebody could help me with this issue. And, finally, I'd like to thank all the readers who dedicated their time in reading this question.

edit: I just realized I was using /usr/default/jre/bin/javac. I fixed that to /usr/jdk1.8.0\_51/jre/bin/javac when I tried Java SDK 8.