How To Install objenesis on CentOS 7
Introduction
In this tutorial we learn how to install objenesis on CentOS 7.
What is objenesis
Objenesis is a small Java library that serves one purpose instantiate a new object of a particular class. Java supports 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, that have side effects, and/or 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 overcome these restrictions by bypassing the constructor on object instantiation. Needing to instantiate an object without calling the constructor is a fairly specialized task, however there are certain cases when this is useful * Serialization, Remoting and Persistence - Objects need to be instantiated and restored to a specific state, without invoking code. * Proxies, AOP Libraries and Mock Objects - Classes can be sub-classed without needing to worry about the super() constructor. * Container Frameworks - Objects can be dynamically instantiated in non-standard ways.
We can use yum or dnf to install objenesis on CentOS 7. In this tutorial we discuss both methods but you only need to choose one of method to install objenesis.
Install objenesis on CentOS 7 Using yum
Update yum database with yum using the following command.
sudo yum makecache
After updating yum database, We can install objenesis using yum by running the following command:
sudo yum -y install objenesis
Install objenesis on CentOS 7 Using dnf
If you don’t have dnf installed you can install DNF on CentOS 7 first.
Update yum database with dnf using the following command.
sudo dnf makecache
After updating yum database, We can install objenesis using dnf by running the following command:
sudo dnf -y install objenesis
How To Uninstall objenesis on CentOS 7
To uninstall only the objenesis package we can use the following command:
sudo dnf remove objenesis
References
Summary
In this tutorial we learn how to install objenesis on CentOS 7 using yum and dnf.
