GWT - Inject value using Guice @Named

Question

I have Utility class as below.

class Utility{
  @Inject
  @Named("endpoint")
  private String endpoint; //generated only getter
}

I am configuring value for endpoint in the as below.

public class ConfigModule extends AbstractModule {
  @Override
  protected void configure() {
    bindConstant().annotatedWith(Names.named("endpoint"))
    .to("Endpoint URL");
  }
}

In my GWT class I am trying to get this value.

public class MyUIPanel extends Composite {
  @Override
  protected void onLoad() {
    Window.Location.assign(new Utility().getEndpoint());
  }
}

UI loaded properly with error coming up in browser console saying You are executing Names.named() in GWT code. GWT does not emulate enough of Java that will work.

Also tried to inject Utility class in MyUIPanel class using guice but getting below error at the time of building war Binding requested for constant key Key[type=java.lang.String, annotation=@com.google.inject.name.Named(value=CognitoEndpoint)] but no explicit binding was found.

Shouldn't `Utility` instantiated by Guice also in order to make `endpoint` be properly injected? — Alexey R., Nov 03 '22 at 14:26
@AlexeyR. edited the question with error I am getting for injecting Utility using Guice — Harsh Kanakhara, Nov 03 '22 at 14:33
How do you tell Guice to use `ConfigModule` to resolve injections? — Alexey R., Nov 03 '22 at 14:54
In implementation of GuiceServletContextListener I am injecting all classes using Guice.createInjector() — Harsh Kanakhara, Nov 04 '22 at 03:24
AFAIK, you can not use Guice on the client. That's what the message is telling you. Try Dagger on the client side or just use a Factory or something else ... — El Hoss, Nov 04 '22 at 06:37

score 0 · Accepted Answer · answered Nov 04 '22 at 06:47

0

Found out Guice cannot be used on client side.

To fetch static values inside our GWT Client Code, we can bind those values inside class extending AbstractGinModule class.

To fetch dynamic values from properties files, write logic on server side and get values on client side using GWT RPC.

answered Nov 04 '22 at 06:47

Harsh Kanakhara

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I would suggest to not use GIN, as it is no longer under active development and is not J2CL compatible. – El Hoss Nov 07 '22 at 09:13
I am not sure. I am new to GWT. I recently joined the project and found out GIN is already implemented and I am not allowed to change it. – Harsh Kanakhara Nov 07 '22 at 12:22

GWT - Inject value using Guice @Named

1 Answers1