Creating automated performance test

I am trying to automate the creating and running the performance test script. Firstly, I create the UML activity diagram and I can export this diagram to outside as a xml file. I write a java program that can read this xml file. Now I want to create test script with using the properties which is a separate file that include host, username, time, etc. knowledge about the configuration. I want to use these two files and create a test script for performance test. Which performance test tool is useful and appropriate for my plan? Also I read the jmeter documentation and it can not be run from the script. Jmeter is manually configured.