Install Multiple Versions of Java with SDKMAN

What is SDKMAN?

SDKMAN! is a tool for managing parallel versions of multiple Software Development Kits. This is very useful for managing Java versions as well as Gradle, Maven etc..

Installation

Open up a terminal and enter:

curl -s "https://get.sdkman.io" | bash

This will add the following to your .bashrc or .zshrc:

#THIS MUST BE AT THE END OF THE FILE FOR SDKMAN TO WORK!!! export SDKMAN_DIR="/home/chris/.sdkman" [[ -s "/home/chris/.sdkman/bin/sdkman-init.sh" ]] && source "/home/chris/.sdkman/bin/sdkman-init.sh"

Now you can open a new terminal and run the following to confirm installation:

sdk version

Install to a custom location

You can install to a custom location with the following command:

export SDKMAN_DIR="/usr/local/sdkman" && curl -s "https://get.sdkman.io" | bash

Install without modifying shell config

If you don't want it to modify your .bashrc or .zshrc then set rcupdate=fale:

curl -s "https://get.sdkman.io?rcupdate=false" | bash

Using SDKMAN

SDKMAN will allow you to install a lot of different programs.

List all options to install

sdk ls

Installing Java

Install default version:

sdk install java

Find a specific version:

sdk ls java

Install a specific version based on identifier from list:

sdk install java 15.0.2.j9-adpt

Using a specific version:

sdk use java 15.0.2.j9-adpt

Default a specific version:

sdk default java 15.0.2.j9-adpt

To update sdkman:

sdk update

NOTE All of the above commands will work for the other programs available such as:

• gradle
• maven
• groovy
• kotlin
• spark
• springboot

Getting help

sdk help

Optional Configuration

In ~/.sdkman/etc/config

# make sdkman non-interactive, preferred for CI environments sdkman_auto_answer=true|false # perform automatic selfupdates sdkman_auto_selfupdate=true|false # disables SSL certificate verification # https://github.com/sdkman/sdkman-cli/issues/327 # HERE BE DRAGONS.... sdkman_insecure_ssl=true|false # configure curl timeouts sdkman_curl_connect_timeout=5 sdkman_curl_continue=true sdkman_curl_max_time=10 # subscribe to the beta channel sdkman_beta_channel=true # enable verbose debugging sdkman_debug_mode=true|false # enable colour mode sdkman_colour_enable=true|false # enable automatic env sdkman_auto_env=true|false

References

SDKMAN!