qdox generates invalid java for nested class references

Using the gwt-maven-plugin with qdox version 1.9. Qdox generates invalid references to nested classes:

Example:

Original class:
import com.google.gwt.gen2.table.client.TableModelHelper;
public SerializableResponse<Result> doSomething(Long id, TableModelHelper.Request request);

Generated class:
void doSomething( java.lang.Long id com.google.gwt.gen2.table.client.TableModelHelper$Request request, AsyncCallback<com.google.gwt.gen2.table.client.TableModelHelper$SerializableResponse<Result>> callback );

The dollar sign in the generated class seems incorrect since that will not compile.