Netty version is conflict with play 2.5.9.

Oops, cannot start the server.
io.netty.channel.ChannelException: Unable to create Channel from class class io.netty.channel.socket.nio.NioServerSocketChannel
	at io.netty.bootstrap.AbstractBootstrap$BootstrapChannelFactory.newChannel(AbstractBootstrap.java:455)
	at io.netty.bootstrap.AbstractBootstrap.initAndRegister(AbstractBootstrap.java:306)
	at io.netty.bootstrap.AbstractBootstrap.doBind(AbstractBootstrap.java:271)
	at io.netty.bootstrap.AbstractBootstrap.bind(AbstractBootstrap.java:235)
	at play.core.server.NettyServer.bind(NettyServer.scala:139)
	at play.core.server.NettyServer.play$core$server$NettyServer$$bindChannel(NettyServer.scala:224)
	at play.core.server.NettyServer$$anonfun$1.apply(NettyServer.scala:216)
	at play.core.server.NettyServer$$anonfun$1.apply(NettyServer.scala:216)
	at scala.Option.map(Option.scala:146)
	at play.core.server.NettyServer.<init>(NettyServer.scala:216)
	at play.core.server.NettyServerProvider.createServer(NettyServer.scala:279)
	at play.core.server.NettyServerProvider.createServer(NettyServer.scala:278)
	at play.core.server.ServerProvider$class.createServer(ServerProvider.scala:25)
	at play.core.server.NettyServerProvider.createServer(NettyServer.scala:278)
	at play.core.server.ProdServerStart$.start(ProdServerStart.scala:53)
	at play.core.server.ProdServerStart$.main(ProdServerStart.scala:22)
	at play.core.server.NettyServer$.main(NettyServer.scala:300)
	at play.core.server.NettyServer.main(NettyServer.scala)
Caused by: java.lang.NoSuchMethodError: io.netty.util.CharsetUtil.encoder(Ljava/nio/charset/Charset;)Ljava/nio/charset/CharsetEncoder;
	at io.netty.buffer.ByteBufUtil.<clinit>(ByteBufUtil.java:61)
	at io.netty.buffer.ByteBufAllocator.<clinit>(ByteBufAllocator.java:24)
	at io.netty.channel.DefaultChannelConfig.<init>(DefaultChannelConfig.java:53)
	at io.netty.channel.socket.DefaultServerSocketChannelConfig.<init>(DefaultServerSocketChannelConfig.java:45)
	at io.netty.channel.socket.nio.NioServerSocketChannel$NioServerSocketChannelConfig.<init>(NioServerSocketChannel.java:189)
	at io.netty.channel.socket.nio.NioServerSocketChannel$NioServerSocketChannelConfig.<init>(NioServerSocketChannel.java:187)
	at io.netty.channel.socket.nio.NioServerSocketChannel.<init>(NioServerSocketChannel.java:85)
	at io.netty.channel.socket.nio.NioServerSocketChannel.<init>(NioServerSocketChannel.java:70)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at java.lang.Class.newInstance(Class.java:442)
	at io.netty.bootstrap.AbstractBootstrap$BootstrapChannelFactory.newChannel(AbstractBootstrap.java:453)
	... 17 more

"io.netty" % "netty-all" % "4.0.40.Final" force()