Install JDK 8 on Raspberry Pi

What you need:

• Raspberry Pi (model B)
• Raspbian installed

Install JDK 8:

• Get Oracle JDK 8 (with JavaFX) for ARM from the Oracle download page: http://jdk8.java.net/download.html
  You need the Linux ARMv6/7 VFP, HardFP ABI version
• Extract it to /opt/jdk1.8.0/ using:
  sudo tar zxvf jdk-8-ea-b*.tar.gz -C /opt
• Setup Java
  

  sudo update-alternatives --install "/usr/bin/java" "java" "/opt/jdk1.8.0/bin/java" 1
  sudo update-alternatives --install "/usr/bin/javac" "javac" "/opt/jdk1.8.0/bin/javac" 1

If there is more than one java runtime installed check which version is used by output of:

java -version

If it is the wrong java runtime version, solve this by running:

sudo update-alternatives --config java

And choose the appropriate option.