Thanks, that clarified quite a bit.

Now I can create the context variable and use it from Talend.
I can export the job script to a zip file containing libraries, the job in a .jar file.

Now I want to be able to change the properties, in the job, that is started from an existing application. This means that I need to be able to edit the properties file and use that.

The .properties file is a part of the .jar file, so editing that and using the .jar file afterwards would require that i unzip the jar, edit it and jar it again.

I would like to be able to control it from java, like setting the context by passing the context to the runJob method:

runJob("--context=Production");

and refer to a Production.properties file somewhere in the classpath.

Where should I put the Production.properties file if the described way of using the job works?