openjdk-7-source software package provides OpenJDK Development Kit (JDK) source files, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install openjdk-7-source
openjdk-7-source is installed in your system.
Make ensure the openjdk-7-source package were installed using the commands given below,
$ sudo dpkg-query -l | grep openjdk-7-source *
You will get with openjdk-7-source package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Java |
| Package | openjdk-7-source |
| Version | 7u121-2.6.8-1ubuntu0.14.04.1 |
| Description | OpenJDK Development Kit (JDK) source files |
| Sub Section | Java |