We've recently converted our in development webapplication from using GWT-RPC to using RequestFactory. In this process we could not get the BeanModelGenerator to read the getters from the proxy interface. The following generator fixes this problem.

Code:
package com.wis.wisweb2.intra.core.rebind;

import java.util.List;

import com.extjs.gxt.ui.rebind.core.BeanModelGenerator;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.requestfactory.shared.BaseProxy;

/**
 * BeanModel generator with support for GWT AutoBeans.
 * 
 * @author Stig Runar Vangen
 */
public class AutoBeanBeanModelGenerator extends BeanModelGenerator {

    @Override
    protected final void addGetters(final JClassType cls,
            final List<JMethod> methods) {
        // Ignore methods of Object
        if (cls.getSuperclass() != null) {
            addGetters(cls.getSuperclass(), methods);
            addClassGetters(cls, methods);
        }

        if (isAutoBean(cls)) {
            addClassGetters(cls, methods);
        }
    }

    /**
     * @param cls
     *            class to test
     * @return <i>true</i> if given class qualify for AutoBean generation
     */
    private boolean isAutoBean(final JClassType cls) {
        if (cls.getQualifiedSourceName().equals(BaseProxy.class.getName())) {
            return true;
        }

        for (JClassType classType : cls.getImplementedInterfaces()) {
            return isAutoBean(classType);
        }

        return false;
    }

    private void addClassGetters(final JClassType cls,
            final List<JMethod> methods) {
        for (JMethod m : cls.getMethods()) {
            if (m.isPublic() || m.isProtected()) {
                String name = m.getName();
                if ((name.matches("get.*") || name.matches("is.*"))
                        && m.getParameters().length == 0) {
                    methods.add(m);
                }
            }
        }
    }
}
You will also need to define this generator for use in your GWT module definition file.

Code:
	<!-- BeanModel for AutoBean -->
	<generate-with class="com.wis.wisweb2.intra.core.rebind.AutoBeanBeanModelGenerator">
		<when-type-assignable class="com.extjs.gxt.ui.client.data.BeanModelLookup" />
	</generate-with>
This definition should override the generator from the ExtGWT package.

Stig Runar Vangen
Waade Information System