You have to use the property name of the entity proxy. So in your case
.with("lineItems"). If you need more than one property you can just add it
to the parameter list, e.g. .with("lineItems", "otherPropertyName"). You can
also go down the hierarchy with a dot notation. Imagine your
InvoiceDetailsProxy contains a property "A" (which is an entity proxy) and
you also want that property to be not null, you would add it to the with
method like: .with("lineItems", "lineItems.a").
Your other properties are already filled because they are primitive types (
= no entity proxy). Only properties that are entity proxies or lists of
entity proxies are null when you do not add these properties to the .with()
method.
If you use the Editor Framework from GWT there is also a getPaths() method
on the editor driver which returns an array of strings with all the property
names the editor needs to be loaded. So you would do
.with(editorDriver.getPaths()).
-- J.
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