Question

For my project I’ve trying to extend GWT classes that not inherited with client modules.
For example I want to create a simple implementation of com.google.gwt.resources.ext.ResourceGenerator.

public class SimpleResourceGenerator implements ResourceGenerator

and use instead of ClientBundle’s default @ResourceGeneratorType – BundleResourceGenerator

@ResourceGeneratorType(SimpleResourceGenerator.class)
    public interface Resources extends ClientBundle {

but unsuccess.

If I place my SimpleResourceGenerator class under “client” package, GWT compiler says:

         [ERROR] Line 11: No source code is available for type com.google.gwt.resources.ext.ResourceGenerator; did you forget to inherit a required module?
         [ERROR] Line 13: No source code is available for type com.google.gwt.core.ext.TreeLogger; did you forget to inherit a required module?
         [ERROR] Line 13: No source code is available for type com.google.gwt.resources.ext.ResourceContext; did you forget to inherit a required module?
         [ERROR] Line 13: No source code is available for type com.google.gwt.core.ext.typeinfo.JMethod; did you forget to inherit a required module?
         [ERROR] Line 14: No source code is available for type com.google.gwt.core.ext.UnableToCompleteException; did you forget to inherit a required module?
         [ERROR] Line 19: No source code is available for type com.google.gwt.resources.ext.ClientBundleFields; did you forget to inherit a required module?
         [ERROR] Line 36: No source code is available for type com.google.gwt.resources.ext.ClientBundleRequirements; did you forget to inherit a required module?

If I link all gwt-user and gwt-dev sources to project I have other unresolved dependencies.

Loading inherited module 'com.google.gwt.user.User'
   Loading inherited module 'com.google.gwt.animation.Animation'
      Loading inherited module 'com.google.gwt.core.Core'
         Loading inherited module 'com.google.gwt.core.CrossSiteIframeLinker'
            [ERROR] Unable to load class 'com.google.gwt.core.linker.DirectInstallLinker'
java.lang.ClassNotFoundException: com.google.gwt.core.linker.DirectInstallLinker

I can’t understand the GWT compiler and how it resolves types while compile-time. Why it finds some of GWT classes and can’t find the others.

The only way I see is to compile SimpleResourceGenerator’s module rewriting

   <generate-with
    class="com.google.gwt.resources.rebind.context.StaticClientBundleGenerator">

    <!-- We have to specify on which types to execute the Generator -->
    <when-type-assignable
      class="com.google.gwt.resources.client.ClientBundle" />
   </generate-with>

from inherited com.google.gwt.resources.Resources.gwt.xml with own generator

  <generate-with
    class="com.example.gwt.SimpleBundleGenerator">
      <when-type-assignable
        class="com.google.gwt.resources.client.ClientBundle" />
  </generate-with>

and extend com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.

But it seems a little too complex to me.
Is there a more simple way to extend GWT classes than deferred binding via generators and code replacement?

Answer 1

Generators should not be included in a “client” package, but the java sources it generates should.

The “client” package is for the gwt-compile to find the java source files that it should use when compiling your app to javascript and a Generator is used to produce javasource files on compiletime.