Step-by-Step Guide to Installing Oracle Java JRE on Ubuntu Linux

• Technology
Quick Links:
• 1. Introduction
• 2. System Requirements
• 3. Preparation
• 4. Downloading Oracle Java JRE
• 5. Installing Oracle Java JRE
• 6. Setting Environment Variables
• 7. Verifying the Installation
• 8. Troubleshooting Common Issues
• 9. Alternatives to Oracle Java JRE
• 10. FAQs

1. Introduction

Java is a versatile programming language widely used for developing applications and services across various platforms. Oracle's Java Runtime Environment (JRE) is essential for running Java applications on your system. In this guide, we'll walk through the steps to install Oracle Java JRE on Ubuntu Linux, ensuring that you have everything you need to get started with Java development or simply run Java applications.

2. System Requirements

Before diving into the installation process, it is crucial to verify that your Ubuntu system meets the following requirements:

• Ubuntu version: 20.04 LTS or higher
• At least 512 MB of RAM (1 GB or more recommended)
• At least 300 MB of free disk space
• Internet connection for downloading packages

3. Preparation

Start by updating your system to ensure that all existing packages are up-to-date. Open your terminal and run the following command:

sudo apt update && sudo apt upgrade -y

This command updates your package list and installs any available updates for your installed packages.

4. Downloading Oracle Java JRE

To download Oracle Java JRE, you can either visit the official Oracle website or use a command line tool. Follow these steps to download it using the terminal:

1. Navigate to the Oracle JRE download page: Oracle JRE Download.
2. Select the appropriate version for your system (e.g., Linux x64).
3. Accept the license agreement and copy the download link for the tar.gz file.
4. In your terminal, use wget followed by the copied URL to download the file. For example:

wget https://download.oracle.com/otn-pub/java/jdk/8u202-b08/jre-8u202-linux-x64.tar.gz

5. Installing Oracle Java JRE

Once you've downloaded the tar.gz file, you can proceed with the installation:

1. Extract the downloaded archive:

tar -xzf jre-8u202-linux-x64.tar.gz

2. Move the extracted folder to the /opt directory:

sudo mv jre1.8.0_202 /opt/

3. Create a symbolic link to the Java binaries:

sudo ln -s /opt/jre1.8.0_202/bin/java /usr/bin/java

4. Update your alternatives to make this version of Java the default:

sudo update-alternatives --install /usr/bin/java java /opt/jre1.8.0_202/bin/java 1

6. Setting Environment Variables

To ensure your system recognizes Java, you must set up environment variables. Open your .bashrc file:

nano ~/.bashrc

At the end of the file, add the following lines:

export JAVA_HOME=/opt/jre1.8.0_202
export PATH=$JAVA_HOME/bin:$PATH

Save and exit the editor, then run:

source ~/.bashrc

7. Verifying the Installation

To confirm that Java has been successfully installed, execute the following command:

java -version

If installed correctly, you should see the version of Java you just installed.

8. Troubleshooting Common Issues

If you encounter errors during installation, consider the following troubleshooting tips:

• Ensure that you have downloaded the correct version for your architecture.
• Verify that you have the necessary permissions to install software.
• Check for any errors in the terminal output and search for solutions online.

9. Alternatives to Oracle Java JRE

If you prefer not to use Oracle's JRE, there are several open-source alternatives available, including:

• OpenJDK: A popular open-source implementation of the Java Platform.
• AdoptOpenJDK: A community-driven project providing prebuilt OpenJDK binaries.

10. FAQs