How To Install gjar on Ubuntu 21.04

One-liner install command

For those in a hurry, here's a one-line installation command:

sudo apt-get update && sudo apt -y install gcj-jdk

But if you are interested in the detailed steps with descriptions, the following information is for you.

What is gjar and what are the ways to install it?

Before beginning this tutorial, you will need access to a server or computer running Ubuntu 21.04. This guide was written specifically with a server running Ubuntu 21.04 in mind, although it should also work on older, supported versions of the operating system.

Also, make sure you are running a regular, non-root user with sudo privileges configured on your server. When you have an account available, log in as your non-root user to begin.

There are several ways to install gjar on Ubuntu 21.04. You can use (links are clickable):

In the following sections, we will describe each method in detail. You can choose one of them or refer to the recommended one.

Install gjar using apt-get

First, update apt database with apt-get using the following command.

sudo apt-get update

After updating apt-get database, You can install gjar using apt by running the following command:

sudo apt -y install gcj-jdk

Install gjar using apt

Because gjar is available in Ubuntu 21.04’s default repositories, it is possible to install it from these repositories using the apt packaging system.

To begin, update apt database with apt using the following command.

sudo apt update

After updating apt database, You can install gjar using apt by running the following command:

sudo apt -y install gcj-jdk

Install gjar using aptitude

If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu 21.04. Update apt database with aptitude using the following command.

sudo aptitude update

After updating aptitude database, You can install gjar by running the following command:

sudo aptitude -y install gcj-jdk

How to upgrade (update) a single package gjar using apt-get?

First, you will need to update packages index. Run update command as usual:

sudo apt-get update

Next, to upgrade only the gjar, e.g. single package, you should use the following format with the apt-get command/apt command:

sudo apt-get --only-upgrade install gcj-jdk

Note that this command will not install any new packages! If you wish to install the package if it doesn't exist you may leave out --only-upgrade part.

sudo apt-get install gcj-jdk

How To Uninstall gjar from Ubuntu 21.04

To uninstall only the gjar package you can execute the following command:

sudo apt-get remove gcj-jdk

Uninstall gjar and all its dependencies

To uninstall gjar and its dependencies that are no longer needed by Ubuntu 21.04, you can use the command below:

sudo apt-get -y autoremove gcj-jdk

Remove gjar with all configurations and data

To remove gjar configuration and data from your system you can run the following purge command:

sudo apt-get -y purge gcj-jdk

Remove gjar completely (configurations, data and all of its dependencies)

And lastly, you can run the next command to remove absolutely everything related to gjar package, e.g.: configurations, data and all of its dependencies. Just use this command:

sudo apt-get -y autoremove --purge gcj-jdk

Extra info and code examples

GCJ is a front end to the GCC compiler which can natively compile both Java(tm) source and bytecode files. The compiler can also generate class files. Other java development tools from Classpath are included in this package. The package contains as well a collection of wrapper scripts and symlinks. It is meant to provide a Java-SDK-like interface to the GCJ tool set.

Conclusion

You now have a full guide on how to install gjar using apt, apt-get and aptitude tools. Also, we showed how to update as a single package and different ways to uninstall the gjar from Ubuntu 21.04.

See also: