Generics in GWT -


i building application uses, gwt (2.4), app engine (1.5.4), , objectify (3.0). application evolving, adding more domain classes , forcing me write more services, more or less same. example should have code crud operations. tried create generic services

//client side @remoteservicerelativepath("generic") public interface genericservice<t extends basedomain> extends remoteservice { .... }  public interface genericserviceasync<t extends basedomain> { ... }  //serverside  @suppresswarnings("serial") public class genericserviceimpl<t extends basedomain>  extends remoteserviceservlet implements genericservice<t> {  //implementation  } 

when trying create instance of on client side using

//domain extends basedomain  public static final genericserviceasync<domain> domainservice =     gwt.create(genericservice.class); 

i getting following exception

java.lang.runtimeexception: deferred binding failed 'com.planner.client.genericservice' (did forget inherit required module?)

i not sure doing wrong, appreciate pointers, and/or alternative approaches.

i don't think issue comes using generics in server side service implementations, missconfiguring services. check following:

  • that have proper genericserviceasync interface created genericservice

  • you have proper server side implementation of genericservice implements interface , extends gwt's remoteserviceservlet class

  • that in web.xml file have configure service servlet expecially servlet-mapping tag should have value of :

    <servlet-mapping> <servlet-name>genericserviceservlet</servlet-name> <url-pattern>/[gwt-module-name]/generic</url-pattern> 

where [gwt-module-name] name you've given gwt project in gwt descriptor file (the 1 called xxx.gwt.xml, if module tag has rename-to attribute, value of attribute yoru gwt-module-name) , "generic" value used in @remoteservicerelativepath("generic")

also, side note, if want make generic service treats domain objects basedomain types should have methods take arguments type, no need use generics it's sub-type well, polymorphism takes care of .


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