Install Java on WSL Ubuntu 18.04


-Host OS: Windows10 Home · Virtual OS: WSL Ubuntu18.04 lts (Ubuntu 18.04 is installed using wsl installed in windows 10)


-Install Java on ubuntu 18.04.


① Package update

$ sudo apt update

② Install OPEN JRE

$ sudo apt-get install default-jre

Check if JRE is installed with the following command

$ java --version
openjdk 11.0.6 2020-01-14
OpenJDK Runtime Environment (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1)
OpenJDK 64-Bit Server VM (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1, mixed mode, sharing)

② Install OPEN JDK

$ sudo apt-get install default-jdk

Make sure you have the same installation as before. javac is a command that deals with the Java compiler.

$ javac --version
javac 11.0.6

Both ① and ② can be installed by specifying the version, but I think it is safe to install the latest version with default-jre and default-jdk until you are used to it.

③ Setting environment variables

First, check the java installation path with the following command.

$ sudo update-alternatives --config java
There is only one alternative in link group java (providing /usr/bin/java): /usr/lib/jvm/java-11-openjdk-amd64/bin/java
Nothing to configure

I was able to confirm that the Java installation path is / usr / lib / jvm / java-11-openjdk-amd64.

Then open the bash file with the following command.

$ vi ~/.bashrc

Set the following environment variables in the bash file.

export JDK_HOME = "/usr/lib/jvm/java-11-openjdk-amd64"


After saving your edits with the: wq! Command, close the bash file.

** * When I read the article about Java environment construction, I often set the environment variable to $ JAVA_HOME, but then the VScode extension did not work and I felt it was inconvenient. ** **

Make sure the environment variables are set.

$ echo $JDK_HOME

You have successfully installed Java.

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