Trying to understand your requirement
Statement 1 and 2
I have created SAS Stored Process with several input parameters and have deployed it as Web Service.
I am interested how can I call my new SAS Web Service.?
There are many approaches to call this web service.
You can use java code, you can use curl, proc http, postman, ARC client , Apache Jmeter to name a few.
All depends on what you want to achieve.
You can pass parameter as XML/JSON and obtain http POST OR GET response.
It all depends on what is the purpose of the call and your stored process.
Statement 3
But maybe someone has some examples how SAS STP Web Service should be called/triggered using Groovy code?
Again what you want to achieve.