In this example, we will show you how to install JDK 7 on Ubuntu 12.

1. Find Openjdk

Ubuntu is using OpenJDK, in terminal, issue this command apt-cache search openjdk to get all the available Openjdk version.

$ apt-cache search openjdk
default-jdk - Standard Java or Java compatible Development Kit
default-jdk-doc - Standard Java or Java compatible Development Kit (documentation)
default-jre - Standard Java or Java compatible Runtime
default-jre-headless - Standard Java or Java compatible Runtime (headless)
icedtea-7-jre-jamvm - Alternative JVM for OpenJDK, using JamVM
icedtea-7-plugin - web browser plugin based on OpenJDK and IcedTea to execute Java applets
openjdk-7-dbg - Java runtime based on OpenJDK (debugging symbols)
openjdk-7-demo - Java runtime based on OpenJDK (demos and examples)
openjdk-7-doc - OpenJDK Development Kit (JDK) documentation
openjdk-7-jdk - OpenJDK Development Kit (JDK)
openjdk-7-jre - OpenJDK Java runtime, using Hotspot JIT
openjdk-7-jre-headless - OpenJDK Java runtime, using Hotspot JIT (headless)
openjdk-7-jre-lib - OpenJDK Java runtime (architecture independent libraries)
openjdk-7-source - OpenJDK Development Kit (JDK) source files
java-package - Utility for creating Java Debian packages

2. Install Openjdk

To install, type this – apt-get install openjdk-7-jdk.

$sudo apt-get install openjdk-7-jdk

3. Verification

Ubuntu installed the JDK in this folder – /usr/lib/jvm/jdk-folder, for example /usr/lib/jvm/java-7-openjdk-amd64/. In additional, Ubuntu also puts the JDK bin folder in the system path, via symbolic link. For example, /usr/bin/java.

To verify if JDK is installed properly, type java -version.

java version "1.7.0_09"
OpenJDK Runtime Environment (IcedTea7 2.3.3) (7u9-2.3.3-0ubuntu1~12.10.1)
OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode)

4. Post-Installation, JAVA_HOME

This step is optional, but recommended. To configure the JAVA_HOME in system path each time the terminal is started, just append the export JAVA_HOME to the end of /etc/profile or .bashrc.

For example.

Bash Terminal
$ echo $JAVA_HOME
//show nothing
$sudo echo export JAVA_HOME="/usr/lib/jvm/java-7-openjdk-amd64/" >> ~/.bashrc
//restart terminal or use "source"
$ source ~/.bashrc 
$ echo $JAVA_HOME


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