Re: Bind an abstract class with its implementation using Guice.

[Stephan Classen]

According to the documentation: constructedType is a concrete class with an @Inject-annotated constructor. In addition to injector-supplied parameters, the constructor should have parameters that match each of the factory method's parameters. Each factory-supplied parameter requires an @Assisted annotation. You have your @Asissted annotation on a field. Try and add a parameter with type Domain to the constructor of TodoResource which is annotated with @Assisted and pass it to the super constructor of DomainResource Hope this works On 02/05/2014 09:36 PM, Rama Krishna Gollapudi wrote: Hello is there any solution to my problem ? On Tuesday, 4 February 2014 12:39:29 UTC-6, Rama Krishna Gollapudi wrote: Here is my abstract class public abstract class DomainResource {     @Inject     @Assisted     private Domain target;     @Inject     private LinkHelper helper;     /**      * Accessor for the domain resource, will return domain information and links to domain scoped resources      * @param info the uri information      * @return a Map representing the returned json      */     @GET     @Produces(APPLICATION_JSON)     @SuppressWarnings("nls")     public Map<String, Object> get(@Context final UriInfo info) {                  return "Implement your stuff";     } } Implementaion public class TodoResource extends DomainResource {     @Inject     private Domain domain;     @Inject     private ScopedResourceFactory factory;     @Inject     private LinkHelper helper;     @GET     @Produces(APPLICATION_JSON)     public Map<String, Object> getTypes(@Context final UriInfo uriInfo) {         return helper.indexMapResponse();     }     /**      * @param info uriInfo object used to extract matrix params      * @return the encounters resource      */     @Path("todos")     public Object getEncounters(@Context final UriInfo info) {         return " implement Your Stuff.";     } } Factory : public interface ScopedResourceFactory {     DomainResource domainResource(Domain target); } And as per your suggestion i'm binding like this.   install(new FactoryModuleBuilder().implement(DomainResource.class, TodoResource.class).build(                     ScopedResourceFactory.class)); But still i'm getting exception. Please find below.  com.rama.util.jaxrs.DomainResource is abstract, not a concrete class.  Unable to create AssistedInject factory.   while locating com.cerner.iaware.util.jaxrs.DomainResource   at com.rama.util.guice.ScopedResourceFactory.domainResource(ScopedResourceFactory.java:1) 1 error at com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:448) at com.google.inject.internal.InternalInjectorCreator.initializeStatically(InternalInjectorCreator.java:155) at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:107) at com.google.inject.Guice.createInjector(Guice.java:96) at com.google.inject.Guice.createInjector(Guice.java:73) at com.google.inject.Guice.createInjector(Guice.java:62) at com.rama.todo.guice.GuiceConfigurationInitializer.getInjector(GuiceConfigurationInitializer.java:49) at com.google.inject.servlet.GuiceServletContextListener.contextInitialized(GuiceServletContextListener.java:47) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) On Tuesday, 4 February 2014 12:09:47 UTC-6, Sam Berlin wrote: The assisted inject docs describe how to do this.  The example in the doc reads:  install(new FactoryModuleBuilder()      .implement(Payment.class, RealPayment.class)      .build(PaymentFactory.class)); You'd just substitute Payment for DomainResource, RealPayment for TodoResource, and PaymentFactory for your assistedinject factory.  sam On Tue, Feb 4, 2014 at 12:38 PM, Rama Krishna Gollapudi <kitt...@gmail.com> wrote: Hello,           I'm having  a problem of binding an abstract class with it's implementation using Guice . I'm getting the following exception. com.rama.util.jaxrs.DomainResource is abstract, not a concrete class.  Unable to create AssistedInject factory. And  i did binding like this.  bind(DomainResource.class).to(TodoResource.class); DomainResoruce is an abstract class and TodoResource is an implementation.  Thanks, Rama. -- You received this message because you are subscribed to the Google Groups "google-guice" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-guice...@googlegroups.com. To post to this group, send email to google...@googlegroups.com. Visit this group at http://groups.google.com/group/google-guice. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups "google-guice" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-guice+unsubscr...@googlegroups.com. 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