variables = new TestPlan();
variables.addParameter("server", "jakarta.apache.org");
variables.addParameter("username", "jack");
variables.addParameter("password", "jacks_password");
variables.addParameter("regex", ".*");
JMeterVariables vars = new JMeterVariables();
vars.put("server", "jakarta.apache.org");
JMeterContextService.getContext().setVariables(vars);
JMeterContextService.getContext().setSamplingStarted(true);
}