How to get method signature

The sonarqube version used is 7.7.
I am trying to create a custom rule for which I need the method signature. Currently using visitMethod() but not able to get the required output. The example below will help in understanding what I am trying to achieve.

public ResponseEntity<List<EmployeeEntity>>getAllEmployees**(@RequestParam(defaultValue = "0") Integer pageNo,@RequestParam(defaultValue = "10") Integer limit){

I am trying to get the method signature till getAllEmpployees which i am not able to using visitMethod. please suggest how to do.
And also how to get the entire parameters including default value.

(@RequestParam(defaultValue = "0") Integer pageNo,@RequestParam(defaultValue = "10") Integer limit)