Quick guide to download and install OpenJDK 7 on Debian. - OpenJDK Community Version
OpenJDK is the short form of Open Java Development Kit similar to Oracle's Java Development Kit used to develop Java Applications. Main difference between Oracle JDK and OpenJDK is that OpenJDK is free for all while Oracle Java Development Kit or Oracle JDK requires commercial license. For more details refer openjdk vs oracle jdk
If you want to know more about OpenJDK, you can go through Open Java Development Kit Quick guide.
Go to https://jdk.java.net/archive/ and download the OpenJDK 7 Debian tar distribution openjdk-7u75-b13-linux-x64-18_dec_2014.tar.gz. Here is the quick lik to download the OpenJDK 7 Debian tar file openjdk-7u75-b13-linux-x64-18_dec_2014.tar.gz
To Install OpenJDK 7 Debian Java Runtime ( openjdk-7-jre debian ) - Enter the below command on Debian command line.
$ sudo apt-get install openjdk-7-jre
$ sudo apt-get install openjdk-7-jdk
Once the above steps are successfully completed , we need to set the "JAVA_HOME" and "PATH" environment variables. Enter the following commands to set your environment variables. Make sure that your environment variables point to a valid installation of JDK on your Debianmachine.
Once the OpenJDK 7 Debian Download and installation is complete, we can verify the installed OpenJDK 7 version using below Command.
Go to Debian prompt and type java -version
The above command prints the OpenJDK 7 Debian version you installed.
$ java -version java version "7" Java(TM) SE Runtime Environment (build 7+36-1461) Java HotSpot(TM) 64-Bit Server VM (build 7+36-1461, mixed mode, sharing)
Note: Here is the list of OpenJDK known-issues OpenJDK Known Issues