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teaganga
teaganga

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How to install Java on Linux and use SdkMan to switch between versions

#java #jvm #programming #webdev

I'm writing this guide for Ubuntu/Debian, for other you need to use their package manager. Here’s a simple way to get Java 17 up and running on Ubuntu:

  1. Update your package index 
 sudo apt update
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  1. Install OpenJDK 17 Ubuntu’s repositories include OpenJDK 17 as openjdk-17-jdk. To install both the JRE and JDK: 
 sudo apt install -y openjdk-17-jdk
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  1. Verify the installation 
 java -version
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You should see output like:

 openjdk version "17.0.x" 202x-xx-xx OpenJDK Runtime Environment (build 17.0.x+xx-Ubuntu-...) OpenJDK 64-Bit Server VM (build 17.0.x+xx-Ubuntu-..., mixed mode)
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  1. (Optional) Set JAVA_HOME Many tools need the JAVA_HOME environment variable. First find where Java was installed: 
 readlink -f /usr/bin/java | sed "s:bin/java::"
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That might return, for example, /usr/lib/jvm/java-17-openjdk-amd64/.
To set it system-wide, edit /etc/environment:

 sudo nano /etc/environment
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Add at the end:

 JAVA_HOME="/usr/lib/jvm/java-17-openjdk-amd64/"
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Then reload:

 source /etc/environment echo $JAVA_HOME
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  1. (Alternative) Use SDKMAN! If you need to frequently switch Java versions, to test specific features, the best is to use SDKMAN!. Sdkman is for Java what Nvm(Node version manager) is for node!

Here is how you install it:

 curl -s "https://get.sdkman.io" | bash source "$HOME/.sdkman/bin/sdkman-init.sh" sdk install java 17.0.8-tem # example build sdk use java 17.0.8-tem
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Now you have to add the source line to .bash_rc, to make sdkman available in any command line:

 echo 'source "$HOME/.sdkman/bin/sdkman-init.sh"' >> ~/.bashrc
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You can see which java version are available, you can | grep 17 for a specific version(sdk list java | grep 17):

 sdk list java
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skdman can be used o install other jvm tools, just use sdk list to see all the options:

 sdk list
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The list include( sdk list kotlin will lost kotlin versions, it's case sensitive ):

  • Ant
  • Graddle
  • Kotlin
  • Maven
  • Scala

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