how to create my queru in spring roo -

i beginner.

i try created custom finder. , used "repository jpa " command. repository:

    @roojparepository(domaintype = speaker.class) public interface speakerrepository {     @query("select u speaker u username = :un")       public list<speaker> findllallspeakersnamed(@param("un") string lastname);      }  

service:

public class speakerserviceimpl implements speakerservice { @autowired  speakerrepository speakerrepository; public list<speaker> findllallspeakersnamed(string lastname) {     return speakerrepository.findllallspeakersnamed(lastname);  } }  

and controller:

@requestmapping("/findaspeaker/**") @controller public class findaspeaker {      @autowired     speakerserviceimpl speakerserviceimpl;      @requestmapping(method = requestmethod.post, value = "{id}")     public void post(@pathvariable long id, modelmap modelmap, httpservletrequest request, httpservletresponse response) {     }       @requestmapping     public  string  index(@requestparam("lastname")string lastname) {         string lastname=lastname;         modelmap modle=new modelmap ();           list<speaker> list = speakerserviceimpl.findllallspeakersnamed(lastname);         modle.addattribute("speakers",list);          return  "findaspeaker/index";     }    } 

this can not work.,,,,

your repository interface. spring data supposed auto-detect queries based on name of method, such "list findusersbynamedesc(string name);" auto-create method query users given name. @query tells not guess @ query, use 1 provide instead. example can found here.