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SDKMAN! - Multiple versions of Java
What is SDKMAN!
SDKMAN! is a development tool that allows you to install and manage Java, Scala, Groovy, Maven and many other tools, libraries and programming languages united under JVM platform. It is created for GNU/Linux's and MacOS' users.
Installation
The first step is to paste this command in your terminal and submit it.
curl-s"https://get.sdkman.io" | bashThis will launch the process of installation, which might require your input. After successful installation paste this command and you are ready to work.
source"$HOME/.sdkman/bin/sdkman-init.sh"Usage
You can list all available versions of desired SDK using below command:
sdk list <sdk>Here is output of this command for Groovy.
sdk list groovy================================================================================Available Groovy Versions================================================================================ 3.0.0-beta-3 2.4.8 2.1.4 1.7.6 3.0.0-beta-2 2.4.7 2.1.3 1.7.5 3.0.0-beta-1 2.4.6 2.1.2 1.7.4 3.0.0-alpha-4 2.4.5 2.1.1 1.7.3 3.0.0-alpha-3 2.4.4 2.1.0 1.7.2 3.0.0-alpha-2 2.4.3 2.0.8 1.7.1 3.0.0-alpha-1 2.4.2 2.0.7 1.7.0 2.6.0-alpha-4 2.4.1 2.0.6 1.6.9 2.6.0-alpha-3 2.4.0 2.0.5 1.6.8 2.6.0-alpha-2 2.3.11 2.0.4 1.6.7 2.6.0-alpha-1 2.3.10 2.0.3 1.6.6 2.5.8 2.3.9 2.0.2 1.6.5 2.5.7 2.3.8 2.0.1 1.6.4 2.5.6 2.3.7 2.0.0 1.6.3 2.5.5 2.3.6 1.8.9 1.6.2 2.5.4 2.3.5 1.8.8 1.6.1 2.5.3 2.3.4 1.8.7 1.6.0 2.5.2 2.3.3 1.8.6 1.5.8 2.5.1 2.3.2 1.8.5 1.5.7 2.5.0 2.3.1 1.8.4 1.5.6 2.4.17 2.3.0 1.8.3 1.5.5 2.4.16 2.2.2 1.8.2 1.5.4 2.4.15 2.2.1 1.8.1 1.5.3 2.4.14 2.2.0 1.8.0 1.5.2 2.4.13 2.1.9 1.7.11 1.5.1 2.4.12 2.1.8 1.7.10 1.5.0 2.4.11 2.1.7 1.7.9 2.4.10 2.1.6 1.7.8 2.4.9 2.1.5 1.7.7================================================================================+ -localversion* - installed> - currentlyinuse================================================================================Installation is effortless. Select any of available versions or just skip it and install the currently stable version.
sdkinstall <sdk>(<version>)Let's try install Java 11. Pastesdk install java 11.0.4-hs-adpt and hit Enter.
sdkinstalljava 11.0.4.hs-adptDownloading: java 11.0.4.hs-adptIn progress...######################################################################## 100,0%Repackaging Java 11.0.4.hs-adpt...Done repackaging...Installing: java 11.0.4.hs-adptDone installing!Do you want java 11.0.4.hs-adpt to besetas default?(Y/n): Setting java 11.0.4.hs-adpt as default.All installed Java versions will be available in the folder$SDKMAN_DIR/candiadates/java.
ls$SDKMAN_DIR/candidates/java-ltotal 8drwxr-xr-x. 9 wpanas wpanas 4096 10-18 17:44 8u152-zuludrwxr-xr-x. 10 wpanas wpanas 4096 11-04 16:22 9.0.1-zululrwxrwxrwx. 1 wpanas wpanas 47 12-25 17:23 current -> /home/wpanas/.sdkman/candidates/java/11.0.4.hs-adptYou can check if installation was successful by checking current Java version. The commandjava --version will not work in Java 8 or any previous, so let's try it.
java--versionopenjdk 11.0.4 2019-07-16OpenJDK Runtime Environment AdoptOpenJDK(build 11.0.4+11)OpenJDK 64-Bit Server VM AdoptOpenJDK(build 11.0.4+11, mixed mode)As you can see Java 11 is installed and ready to work. If you want to switch default Java's version use commandsdk default java <version>, but you can also switch version only for current terminal session usingsdk use java <version>. It's very convenient, if you want to check, how your code would behave on different Java version.
Summary
SDKMAN! is an essential tool for developers using Java, Groovy or any other JVM language. Check it out and you will not be disappointed.
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