Install Java Development Kit on Windows Subsystem for Linux

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Install default JDK

Install default JDK (OpenJDK 8 at the moment of writing):

root@localhost ~ # apt install default-jdk

Verify java and javac version:

user@localhost ~ $ java -version
user@localhost ~ $ javac -version

Install other OpenJDK versions

OpenJDK 9 (optional)

OpenJDK 9 is no longer supported and is only available from the OpenJDK archives

root@localhost ~ # /opt

Download and install the OpenJDK 9 binaries

root@localhost /opt # wget -O /opt/openjdk-9.0.4_linux-x64_bin.tar.gz https://download.java.net/java/GA/jdk9/9.0.4/binaries/openjdk-9.0.4_linux-x64_bin.tar.gz
root@localhost /opt # tar xvzf openjdk-9.0.4_linux-x64_bin.tar.gz
root@localhost /opt # ln -s jdk-9.0.4 jdk-9
root@localhost /opt # rm openjdk-9.0.4_linux-x64_bin.tar.gz

OpenJDK 10 (optional)

OpenJDK 10 is available at http://jdk.java.net/10/

root@localhost ~ # /opt

Download and install the OpenJDK 10 binaries

root@localhost /opt # tar xvzf openjdk-10.0.2_linux-x64_bin.tar.gz
root@localhost /opt # ln -s jdk-10.0.2 jdk-10
root@localhost /opt # rm openjdk-10.0.2_linux-x64_bin.tar.gz

OpenJDK 11 (optional)

OpenJDK 11 is available at http://jdk.java.net/11/

root@localhost ~ # /opt

Download and install the OpenJDK 11 binaries

root@localhost /opt # tar xvzf openjdk-11.0.1_linux-x64_bin.tar.gz
root@localhost /opt # ln -s jdk-11.0.1 jdk-11
root@localhost /opt # rm openjdk-11.0.1_linux-x64_bin.tar.gz

OpenJDK 12 (optional)

OpenJDK 12 early access is available at http://jdk.java.net/12/

root@localhost ~ # /opt

Download and install the OpenJDK 12 binaries

root@localhost /opt # tar xvzf openjdk-12-ea+16_linux-x64_bin.tar.gz
root@localhost /opt # rm openjdk-12-ea+16_linux-x64_bin.tar.gz

Java switcher script (optional)

When using multiple Java versions it's useful to be able to easily switch between them. The following script updates the JAVA_HOME and the PATH for the selected JDK version.

user@localhost ~ $ nano -w ~/bin/jsw
#!/usr/bin/env bash

case "${1}" in
    "8")
        export JAVA_HOME=""
        ;;
    "9")
        export JAVA_HOME=/opt/jdk-9
        ;;
    "10")
        export JAVA_HOME=/opt/jdk-10
        ;;
    "11")
        export JAVA_HOME=/opt/jdk-11
        ;;
    "12")
        export JAVA_HOME=/opt/jdk-12
        ;;
esac

export PATH="~/bin:${JAVA_HOME}/bin:/usr/local/bin:/usr/bin:/bin"

echo "${JAVA_HOME}"
echo "${PATH}"
java -version
javac -version

Verify that jsw works and sets the java and javac version.

user@localhost ~ $ source ~/bin/jsw 8
user@localhost ~ $ java -version
user@localhost ~ $ javac -version
user@localhost ~ $ source ~/bin/jsw 9
user@localhost ~ $ java -version
user@localhost ~ $ javac -version
user@localhost ~ $ source ~/bin/jsw 10
user@localhost ~ $ java -version
user@localhost ~ $ javac -version
user@localhost ~ $ source ~/bin/jsw 11
user@localhost ~ $ java -version
user@localhost ~ $ javac -version
user@localhost ~ $ source ~/bin/jsw 12
user@localhost ~ $ java -version
user@localhost ~ $ javac -version

Continue with Installing developer tools on Windows Subsystem for Linux

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