In this post I will show where our Oracle JDeveloper version 12.2.1.2.0, since in version 12c it was already installed when you install the SOA Suite.
The JDeveloper IDE is used to create and deploy SOA Composition
This installation will be done on Ubuntu Linux 64bit version: 16:04, the minimum hardware and software for Oracle SOA Suite 12c installation can be found here: http://docs.oracle.com/html/E18558_01/fusion_requirements.htm