Re: extend UiBinder engine

I visibly don't need to rewrite the UiBinderGenerator, there's space left for non generating a field in com.google.gwt.uibinder.rebind.FieldWriter : it's specified in the javadoc

The weired thing is that I don't understand from the comment  (In the rare case that you need a field not to be initialized, initialize it to "null".)

what they want me to initialize to null: it's clearly visible in the implementation com.google.gwt.uibinder.rebind.AbstractFieldWriter.write(IndentedWriter)  that if initializer is null, the code generation defalts to GWT.create

The code always wants a field initializer. If you don't specify one then GWT.create() will be used to initialize a field. In some cases GWT.create() won't work because you don't have or don't want to use the default constructor, so you can define your own field initializer. Do a reference search on setInitializer to see who is doing so. 

The JavaDoc now says if you want to initialize a field to null, you must define an initializer and that initializer should init that field to null (e.g. setInitializer("null"))

-- J.

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