java - Service abstraction springMVC -

i'm trying create abstract service in springmvc application. data flows* perfect through layers, persistence (abstraction), not find way save/delete/update database, these classes:

abstract class baseserviceimpl<t, id extends serializable>  implements baseservice<t, id> {  protected abstract baserepository<t, id> getrepository();  private baserepository<t, id> repository;  public baseserviceimpl(baserepository<t, id> repository){    this.repository = repository; }  public list<t> findall(){     return getrepository().findall(); }  public t find(id id){     return getrepository().findone(id); }  public t save(t persisted){     return this.repository.save(persisted); }  public void delete(id id){     getrepository().delete(id); }  public long count(){     return getrepository().count(); }  public boolean exists(id id){     return getrepository().exists(id); }   } 

//---

@service public class medicineserviceimpl extends baseserviceimpl<medicine, integer>  implements medicineservice {  @autowired private medicinerepository repository;  @autowired public medicineserviceimpl(medicinerepository repository) {     super(repository); }  @override public baserepository<medicine, integer> getrepository() {     return repository; } } 

//--

@mappedsuperclass abstract class basedomain {  @id @generatedvalue(strategy = generationtype.auto) private integer id;  public integer getid() {     return id; }  public void setid(integer id) {     this.id = id; } } 

//--

@entity @table(name = "medicines") public class medicine extends basedomain implements serializable{  @notnull private string name; private string description; private string purpose; @column(name = "active_principle") private string activeprinciple; @column(name = "therapeutic_class") private string therapeuticclass; @column(name = "ean_code") private string eancode; @column(name = "ms_code") private string mscode; @column(name = "avisa_warning") private string anvisawarning; @column(name = "lab_name") private string labname; @column(name = "lab_phone") private string labphone;  @notnull private string contraindication;  public medicine() { } } 

//--

@norepositorybean public interface baserepository<t,id extends serializable> extends repository<t,id> {  list<t> findall();  long count();  void delete(id id);  t save(t s);  t findone(id id);  boolean exists(id id);  void delete(t deleted);  } 

//--

@repository public interface medicinerepository  extends baserepository<medicine,    integer>{  } 

i got 500 status error , tocatlog shows following message:

severe: servlet.service() servlet [tavalendodispatcherservlet] in context path [/tavalendo] threw exception [request processing failed; nested exception org.springframework.beans.notreadablepropertyexception: invalid property 'id' of bean class [java.util.linkedhashmap]: not find field property during fallback access!] root cause org.springframework.beans.notreadablepropertyexception: invalid property 'id' of bean class [java.util.linkedhashmap]: not find field property during fallback access! @ org.springframework.data.util.directfieldaccessfallbackbeanwrapper.getpropertyvalue(directfieldaccessfallbackbeanwrapper.java:56) @ org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:103) @ org.apache.catalina.valves.accesslogvalve.invoke(accesslogvalve.java:956) @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:116) @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:423) @ org.apache.coyote.http11.abstracthttp11processor.process(abstracthttp11processor.java:1079) @ org.apache.coyote.abstractprotocol$abstractconnectionhandler.process(abstractprotocol.java:625) @ org.apache.tomcat.util.net.jioendpoint$socketprocessor.run(jioendpoint.java:316) @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1145) @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615) @ org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run(taskthread.java:61) @ java.lang.thread.run(thread.java:745)

does can explain happend?

it seems spring cannot find id field of medicine:

invalid property 'id' of bean class [java.util.linkedhashmap]: not find field property during fallback access!] 

actually, medicine not seem have id field, need add it.