How To Install objenesis on Fedora 34
Introduction
In this tutorial we learn how to install objenesis
on Fedora 34.
What is objenesis
Objenesis is a small Java library that serves one purpose 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 Fedora 34. In this tutorial we discuss both methods but you only need to choose one of method to install objenesis.
Install objenesis on Fedora 34 Using dnf
Update yum database with dnf
using the following command.
sudo dnf makecache --refresh
The output should look something like this:
Fedora 34 - x86_64 20 kB/s | 6.6 kB 00:00
Fedora 34 openh264 (From Cisco) - x86_64 1.4 kB/s | 989 B 00:00
Fedora Modular 34 - x86_64 68 kB/s | 6.5 kB 00:00
Fedora 34 - x86_64 - Updates 3.5 kB/s | 6.2 kB 00:01
Fedora Modular 34 - x86_64 - Updates 17 kB/s | 5.9 kB 00:00
Metadata cache created.
After updating yum database, We can install objenesis
using dnf
by running the following command:
sudo dnf -y install objenesis
Install objenesis on Fedora 34 Using yum
Update yum database with yum
using the following command.
sudo yum makecache --refresh
The output should look something like this:
Fedora 34 - x86_64 20 kB/s | 6.6 kB 00:00
Fedora 34 openh264 (From Cisco) - x86_64 1.4 kB/s | 989 B 00:00
Fedora Modular 34 - x86_64 68 kB/s | 6.5 kB 00:00
Fedora 34 - x86_64 - Updates 3.5 kB/s | 6.2 kB 00:01
Fedora Modular 34 - x86_64 - Updates 17 kB/s | 5.9 kB 00:00
Metadata cache created.
After updating yum database, We can install objenesis
using yum
by running the following command:
sudo yum -y install objenesis
How To Uninstall objenesis on Fedora 34
To uninstall only the objenesis
package we can use the following command:
sudo dnf remove objenesis
objenesis Package Contents on Fedora 34
/usr/share/doc/objenesis
/usr/share/doc/objenesis/LICENSE.txt
/usr/share/java/objenesis
/usr/share/java/objenesis/objenesis-tck.jar
/usr/share/java/objenesis/objenesis.jar
/usr/share/maven-metadata/objenesis.xml
/usr/share/maven-poms/objenesis
/usr/share/maven-poms/objenesis/objenesis-parent.pom
/usr/share/maven-poms/objenesis/objenesis-tck.pom
/usr/share/maven-poms/objenesis/objenesis.pom
References
Summary
In this tutorial we learn how to install objenesis
on Fedora 34 using yum and dnf.