How To Install libobjenesis-java on Ubuntu 18.04
Introduction
In this tutorial we learn how to install libobjenesis-java on Ubuntu 18.04.
What is libobjenesis-java
libobjenesis-java is:
Objenesis is a small Java library that serves one purpose: to instantiate a new object of a particular class. Java already supports this dynamic instantiation of classes using Class.newInstance(). However, this only works if the class has an appropriate constructor. There are many times when a class cannot be instantiated this way, such as when the class contains:
- Constructors that require arguments.
- Constructors that have side effects.
- Constructors that throw exceptions. As a result, it is common to see restrictions in libraries stating that classes must require a default constructor. Objenesis aims to overcomes these restrictions by bypassing the constructor on object instantiation.
There are three methods to install libobjenesis-java on Ubuntu 18.04. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install libobjenesis-java Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install libobjenesis-java using apt-get by running the following command:
sudo apt-get -y install libobjenesis-java
Install libobjenesis-java Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install libobjenesis-java using apt by running the following command:
sudo apt -y install libobjenesis-java
Install libobjenesis-java 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. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install libobjenesis-java using aptitude by running the following command:
sudo aptitude -y install libobjenesis-java
How To Uninstall libobjenesis-java on Ubuntu 18.04
To uninstall only the libobjenesis-java package we can use the following command:
sudo apt-get remove libobjenesis-java
Uninstall libobjenesis-java And Its Dependencies
To uninstall libobjenesis-java and its dependencies that are no longer needed by Ubuntu 18.04, we can use the command below:
sudo apt-get -y autoremove libobjenesis-java
Remove libobjenesis-java Configurations and Data
To remove libobjenesis-java configuration and data from Ubuntu 18.04 we can use the following command:
sudo apt-get -y purge libobjenesis-java
Remove libobjenesis-java configuration, data, and all of its dependencies
We can use the following command to remove libobjenesis-java configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge libobjenesis-java
References
Summary
In this tutorial we learn how to install libobjenesis-java package on Ubuntu 18.04 using different package management tools: apt, apt-get and aptitude.
