Installing and Configuring Oracle JDK 6 on Ubuntu 12.04 LTS

====================================================================================

Introduction

----------

Java Development Kit (JDK) is a set of development tools that are used for creating applications in the Java programming language and other languages such as C++ and Fortran. Although newer versions like JDK 8 and higher are recommended by many organizations, there might be situations where you need to work with older projects or systems still using JDK 6.

In this tutorial we will guide you through installing Oracle's official JDK 6 on Ubuntu 12.04 LTS (Long Term Support) version of the popular Linux distribution. The reasons for choosing JDK 6 over newer versions may vary, but one common reason is that some legacy applications and projects are still dependent on it.

Prerequisites

----------

Before proceeding with this tutorial, ensure you have:

1. Ubuntu 12.04 LTS (Precise Pangolin) or later version of the operating system installed.

2. Internet connection to download necessary packages from official Oracle repositories.

Step-by-Step Installation Guide for JDK 6 on Ubuntu 12.4

------------------------------------------------------

### Step 1: Add Oracle's Repository

To install Java Development Kit 6, you need to add Oracle’s repository to your package manager sources list. You can do this by running the following command in a terminal:

```bash

sudo apt-add-repository ppa:webupd8team/java -y && sudo apt update

```

### Step 2: Install JDK and Development Tools

After adding the repository, you need to install Java Development Kit (JDK) along with necessary development tools. You can do this by running the following command in a terminal:

```bash

sudo apt-get install oracle-java6-sdk -y

```

Verify Installation and Set JAVA_HOME Environment Variable

-------------------------------------------------------

To verify whether JDK 6 has been successfully installed on your system, you need to check for its presence in your `javac` and `java` versions. You can do this by running the following commands in a terminal:

```bash

$ javac -version && java -version

```

You should see something similar to this output if everything has been set up correctly:

```bash

javac 1.6.0_31

java version '1.6.0_31'

```

Finally, you need to export the `JAVA_HOME` environment variable so that your system recognizes where Java Development Kit (JDK) is installed on your machine. You can do this by running one of the following commands depending upon whether you are using Bash or another shell:

```bash

export JAVA_HOME=/usr/lib/jvm/java-6-oracle/ && export PATH=$PATH:~/.m2/bin:/opt/maven3/bin:$JAVA_HOME/bin

alias java='export JAVA_HOME=~/Software/jdk1.7_147_jdk; /home/userjohndoe/SOFTWARE/jdk1.7.0_147_x64//bin/java'

```

Troubleshooting and Common Issues

------------------------------

If you encounter any issues during the installation process, here are some common solutions:

### 1. Unable to Update Repository Information

Sometimes, when running `sudo apt update`, you might see an error message similar to this:

```bash

E:Failed to download http://ppa.launchpad.net/webupd8team/java/precise/dists/quantum-ppa/repo.list.

```

To resolve this issue, try updating your package manager cache and then run `sudo apt update` again.

### 2. Unable to Install Java Development Kit

If you encounter an error message like the following during installation:

```bash

E: unable to install of oracle-java6-sdk_1.6.0-31~precise-stable_amd64.deb.

```

Try removing any existing JDK or JRE packages using `sudo apt-get remove --purge` and then re-run `sudo apt-get update && sudo apt-get install -y oracle-java6-sdk`.

-------

In conclusion, this article has provided a step-by-step guide on how to successfully install Oracle's official Java Development Kit (JDK) 6.0 Update 31 on Ubuntu 12.04 LTS version of the popular Linux distribution. Remember that newer versions like JDK 8 and higher are recommended by many organizations due to security reasons, but sometimes older projects or legacy applications still require using older versions.

We hope this tutorial has been helpful in installing Java Development Kit (JDK) 6 on Ubuntu 12.04 LTS version of the operating system. If you encounter any issues during installation or have further questions related to configuring and troubleshooting JDK, feel free to leave a comment below for assistance!

Jdk 6