Activiti bypass activiti rest and call directly to activiti core error

Question

Hi I have an activiti rest project which will call the repository/process-defination to get the all the definitions from an activiti, where activiti rest api is like this-

@GetMapping(value = "/repository/process-definitions", produces = "application/json")
    public DataResponse getProcessDefinitions @RequestParam Map<String, String> allRequestParams, HttpServletRequest request) {

Now instead of calling the activiti rest I need to directly call the activiti core and need to get the same result- I try to implement like this but not able to get the data, what i need to do to get the exact data like activiti rest from above?

    public class MyClass{
    @Autowired
    private ProcessEngine processEngine;
    public List<ProcessDefination> getDef(Map<String, String> allRequestParams){
    RepositoryService rs = processEngine.getRepositoryService();
    return rs.createProcessDefinationQuery().list();
    }
}