ubuntu 14.04 install scala 2.11.7 and sbt 13.9 and java 8 and git

gistfile1.txt

# scala install
wget www.scala-lang.org/files/archive/scala-2.11.7.deb
sudo dpkg -i scala-2.11.7.deb

 
# sbt installation
echo "deb https://dl.bintray.com/sbt/debian /" | sudo tee -a /etc/apt/sources.list.d/sbt.list
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 642AC823
sudo apt-get update
sudo apt-get install sbt


# java install
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer


# git install
sudo apt-get install git

Here is error, how to fix it?

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256M; support was removed in 8.0
java.lang.NoClassDefFoundError: sbt/serialization/package$

install java first