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What is update java alternatives?
update-java-alternatives is a program to update alternatives for jre/jdk installations. update-alternatives is a symbolic link management system for linux (I’m sure there is little news here). You can, and really should, use both update-java-alternatives and update-alternatives together.
How do I install java alternatives?
In this time lets install openJDK 8 version.
- get update your apt sudo apt-get update.
- Now install openJDK 8 sudo apt-get install openjdk-8-jre.
- Set the variables echo “JAVA_HOME$(which java)” | sudo tee -a /etc/environment.
- Reload the system variables source /etc/environment.
- Verify variables using this echo $JAVA_HOME.
What should JAVA_HOME point to?
as a developer, you should point your JAVA_HOME at jdk to access javac copiler etc. It’s good if you can test your program to run on the JRE though. If you are using an app server you often also need the JDK instead of the JRE but that depends on the particular server.
What is Update-alternatives?
update-alternatives creates, removes, maintains and displays information about the symbolic links comprising the Debian alternatives system. It is possible for several programs fulfilling the same or similar functions to be installed on a single sys‐ tem at the same time.
Does maven need java?
Maven needs a JDK, and not a JRE.
How does update-alternatives work with Java home?
Like update-alternatives, it works through symlink management. The advantage is that is manages symlinks to all the Java utilities at once: javac, java, javap, etc. I am yet to see a JAVA_HOME effect on the JDK.
How to install and switch between alternative Java?
sudo update-alternatives — config java When you run this in terminal it shows us what are the available versions that you can switch on.You can choose the number and after you confirm it, it will be your default java version. You can change your java compiler version with following command. sudo update-alternatives — config javac
What to do when Java and javac are showing different versions?
if java and javac are showing different versions, then you can easily set them to the correct or same versions this will show the following results, start (*) indicates the javac version that your system is using. You can change it by selecting your required version.
Where are the Java home and path variables?
I have set the $JAVA_HOME and $PATH environment variables in ~/.profile as follows: I then did source ~/.profile to make the proper changes. When I execute java -version command to check the active java version, it shows the default (already installed open-jdk) java version.