I have a job in Jenkins which has 2 params. I want to run another plan, which has no params and from that plan, launch the existing plan as many times as required.
The n
There is a Parameterized Trigger Plugin which, once installed, allows you to trigger a parameterized build after one build has finished.
The easiest way to accomplish what you want would be to install this plugin, and build the project once with the key/value list that you want to build against. If for some reason you need to execute the build multiple times after the first job completes, then you could use the remote API to start builds from your first project. So you have two options:
Option A
Option B
http://server/job//buildWithParameters?PARAM1=Value1&PARAM2=Value2
(you will need to substitute in your actual project name and parameter names/values)