Java is a well-known programming language for making strong and expandable applications. It started in 1995 and is now one of the top choices in the field. This language is used in many areas, like making desktop and Android apps, playing games, handling big data, and creating websites.
Java’s design is high-level, versatile, and based on objects. This makes it important, especially for building big company-level applications. It’s a top pick for developers. This guide will show how to put OpenJDK 17 on Ubuntu 22.04, the newest long-term support release of Java.
Introduction to Java and Its Significance
Java is a popular programming language used by developers all over the world. It’s loved for its great features and the many applications it supports. As of September 2023, it was the second most popular language, according to the PYPL Popularity of Programming Language Index.
Java as a Popular Programming Language
Java is great because it lets developers make apps that work on different systems like Windows, macOS, and Linux. This makes it easy to reach a wide audience. Java is also known for its strong security, handling many tasks at once, and a big library of tools.
These features make it perfect for big projects, mobile apps, and new tech like AI, VR, and Big Data.
Key Features of Java
Java is widely used because of its many features. It has an object-oriented design, checks types strongly, and manages memory automatically. This makes it a dependable choice for developers.
Java also stands out for its ability to work on any platform, grow easily, and have a huge library of tools and frameworks. This makes it a versatile and strong language for many projects, from apps to big systems.
Prerequisites for Installing Java on Ubuntu
To install Java on your Ubuntu system, you need to meet a few requirements. First, you must have the Ubuntu 22.04 server ready on your machine or in a VirtualBox. Also, you’ll need a root account or a non-root user with “sudo” privileges. This is needed for the admin commands during installation.
These steps are key for a smooth Java setup on Ubuntu 22.04. By making sure your system is ready, you can easily follow the installation steps. This is true whether you’re an experienced developer or new to Ubuntu. Knowing these steps helps you install Java successfully on your system.
With the right setup and permissions, you’re ready to use Java on your Ubuntu 22.04 server. The guide will walk you through installing OpenJDK and Oracle Java 17. It also covers setting the default Java version and the JAVA_HOME environment variable. Meeting these prerequisites lets you fully enjoy Java’s features and capabilities on Ubuntu.
Methods to Install Java on Ubuntu
Installing Java on Ubuntu gives you two choices: OpenJDK or Oracle JDK. OpenJDK is open-source and comes with Ubuntu. Oracle JDK is from Oracle and needs a third-party PPA repository.
Install Java on Ubuntu using OpenJDK
OpenJDK is the top choice for Ubuntu users. To get the latest OpenJDK 17, just use this command in your terminal:
sudo apt install openjdk-17-jdkThis installs the full Java Development Kit (JDK). It includes the compiler, libraries, and tools for Java apps.
Install Oracle Java 17 on Ubuntu using PPA Repository
For the official Oracle Java, add the Linux Uprising PPA repository and install the package. Here’s what to do:
sudo add-apt-repository ppa:linuxuprising/java
sudo apt update
sudo apt install oracle-java17-installerThis installs the latest Oracle Java 17 on your Ubuntu 22.04.
Installing Java on Ubuntu from OpenJDK
To install Java on your Ubuntu system using OpenJDK, just follow a few easy steps. First, make sure your Ubuntu repositories are current by running a command:
Step 1: Update Ubuntu Repositories
Use this command to update the package list:
sudo apt-get updateStep 2: Search OpenJDK using Apt Cache
Next, search for OpenJDK versions with the apt-cache command:
apt-cache search openjdkThis shows a list of OpenJDK packages you can install.
Step 3: Install OpenJDK-17 Java on Ubuntu
To install OpenJDK 17, use this command:
sudo apt-get -y install openjdk-17-jdkThis installs the OpenJDK 17 Java Development Kit on your Ubuntu.
Step 4: Verify Java Installation
Verify the Java installation by checking the Java version:
java -versionThe output will show the OpenJDK 17 version you installed.
That’s it! You’ve installed OpenJDK 17 Java on your Ubuntu system. Now, you can start developing Java applications and use the Java programming language’s powerful features.
Install OpenJDK 17 from Ubuntu Repository
If you’re using Ubuntu 22.04, you’re lucky. The default repository for this version includes OpenJDK 17. This makes it easy to set up Java on your system. Just use the apt install command, and you’ll have OpenJDK 17 ready quickly.
The steps are simple. First, update your system’s package index with the sudo apt update command. Then, install the openjdk-17-jdk package with this command:
sudo apt install openjdk-17-jdkThis installs the full Java Development Kit (JDK) version 17, including the Java Runtime Environment (JRE). After installation, check the Java version by running the java --version command.
The OpenJDK 17 package in Ubuntu’s repository is a dependable and community-supported version of Java. It’s a great choice for developers and users who like open-source software. By installing Java from the Ubuntu repository, you ensure your system works with the latest Java apps and tech. You also get the latest security updates and bug fixes.
Installing Oracle JDK 17 using PPA
To install the latest Oracle Java Development Kit (JDK) 17 on Ubuntu, add a third-party repository called the Linux Uprising PPA. This repository has the packages for the official Oracle Java 17 distribution.
Step 1: Add Oracle Java PPA Linux Uprising Repository
First, add the Linux Uprising PPA to your system’s sources list. Use this command in your terminal:
sudo add-apt-repository ppa:linuxuprising/java
This makes the Linux Uprising repository available. It has the latest Oracle Java 17 packages for Ubuntu.
Step 2: Update Packages Index
After adding the repository, update your system’s package index. This ensures you have the latest package versions:
sudo apt-get updateStep 3: Install Oracle Java 17 on Ubuntu
Next, install Oracle Java 17 with this command:
sudo apt-get install oracle-java17-installerThis command will install Oracle JDK 17 on your Ubuntu system. It also includes accepting the Oracle license agreement. After installation, you’ll have the latest Oracle JDK 17.
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How to Test Java Installation on Ubuntu
After installing Java on Ubuntu, it’s key to check if it worked. This makes sure the Java runtime and compiler are working right. It’s vital for developers and users who want to run Java apps or scripts.
To check your Java installation on Ubuntu, just follow these easy steps:
Step 1: Open the Terminal
First, open the Terminal on your Ubuntu system. You can find it in the Applications menu or by pressing Ctrl + Alt + T.
Step 2: Verify Java Version
In the Terminal, type this command to see the Java version you have:
java -versionThis will show the Java version on your system. Make sure it’s the version you installed, like Java 17.
Step 3: Create a Simple Java Program
Then, make a simple Java program to test the installation. In the Terminal, use these commands:
echo 'public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World!"); }}' > HelloWorld.java
javac HelloWorld.java
java HelloWorldThese commands will make a Java file named HelloWorld.java, compile it, and then run it. If everything’s set up right, you’ll see “Hello, World!” in the Terminal.
By doing these steps, you can test java installation ubuntu and verify java ubuntu. This ensures your Java setup is correct. It’s important for developers and users who work with Java apps or scripts on Ubuntu.
Install OpenJDK 17 on Ubuntu Manually
You can install OpenJDK 17 on Ubuntu without using the package manager. First, download the tar.gz archive from Oracle’s website. Then, extract it and set up the environment variables. This method gives you more control over Java but might need extra setup.
To install OpenJDK 17 on Ubuntu manually, follow these steps:
1. Go to the Oracle Java 17 download page and download the OpenJDK 17 tar.gz archive for your system type (like 64-bit or 32-bit).
2. Use the terminal to extract the tar.gz file with this command:
tar -xvf jdk-17_linux-x64_bin.tar.gz3. Move the extracted files to a good spot on your system, like /opt/java/:
sudo mv jdk-17 /opt/java/4. Edit the .bashrc file to set environment variables:
sudo nano ~/.bashrcAdd these lines at the end:
export JAVA_HOME=/opt/java/jdk-17
export PATH=$JAVA_HOME/bin:$PATHSave the file and close the editor.
5. Reload the environment variables with this command:
source ~/.bashrcNow, OpenJDK 17 is installed on your Ubuntu. Check if it worked by typing this in the terminal:
java -versionThis command should show the Java version you just installed, proving OpenJDK 17 is set up.
Configure Default Java Version on Ubuntu
If you have several Java versions on your Ubuntu system, you can use the update-alternatives command. This lets you set the default Java version for the system and other apps. It’s key when you’re managing many Java versions on your Ubuntu machine.
To set the default Java version, open your terminal and run this command:
sudo update-alternatives --config javaThis command shows you a list of Java versions on your system. Pick the version you want to be the default by entering its number.
After picking a version, it will be the default for your Ubuntu system. Many apps and tools depend on the default Java to work right.
You can also manage multiple Java versions with the update-alternatives command. This makes switching between Java versions easy, without worrying about problems or compatibility.
By following these steps, you make sure your Ubuntu system uses the right Java version. This is useful for new projects or keeping an old one running smoothly.
Set Environment Variable JAVA_HOME for Java on Ubuntu
To make Java work better and let other apps find it easily, set the JAVA_HOME environment variable. This tells where Java is installed. It’s a must-do because many Java apps need this to find Java correctly.
To set the JAVA_HOME and PATH on Ubuntu, use certain commands. First, find the Java path with which javac. This usually shows a path like /usr/lib/jvm, where Java is stored.
Then, add the JAVA_HOME path to your bashrc file. If Java is in /usr/lib/jvm/java-17-openjdk-amd64, add this line to your bashrc file:
export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64Save the bashrc file. Check if JAVA_HOME is set right with echo $JAVA_HOME. It should show the path you entered. For the change to stick, log out and in, or use source ~/.bashrc.
By setting the java_home ubuntu variable and configuring the java environment ubuntu, you make Java apps work smoothly on Ubuntu. This makes it easier to use and run Java programs.
Conclusion
In this guide, I showed you how to install Java 17 on Ubuntu 22.04 LTS. We looked at two ways: using OpenJDK 17 from Ubuntu’s repository and Oracle JDK 17 from the Linux Uprising PPA repository.
I gave you step-by-step instructions. This includes checking if Java is installed, setting the default Java version, and setting the JAVA_HOME environment variable. Now, you should be ready to start using Java 17 on your Ubuntu system for your Java projects.
