Extending builders

Eva Krejcirova eva.krejcirova at oracle.com
Wed Nov 28 07:27:13 PST 2012

There will certainly be methods with one argument, so this means that 
there must be a way for SceneBuilder and FXML to tell these methods 
apart from the property methods.
We can annotate the convenience methods by special annotation (e.g. 
Or we could add an annotation (e.g. BuilderProperty) to the methods 
which correspond to properties (= the methods which are currently in the 


On 22.11.2012 16:01, Daniel Fuchs wrote:
> On 11/22/12 3:40 PM, Eva Krejcirova wrote:
>> Hi,
>> There is one more thing which needs to be sorted out before adding new
>> methods to builders:
>> SceneBuilder and FXML use builders to find names of properties of a
>> class, so they need to have a way to differentiate between the new
>> convenience methods and the methods which correspond to properties of a
>> class. Daniel, is this still true?
>> Last time we discussed this, Daniel suggested to annotate these new
>> convenience methods. If we go this way, we need to create a new runtime
>> annotation (and find a name for it :-) )
>> Eva
> Hi Eva,
> Yes this is still true. Note that SceneBuilder actually uses
> builders only in special cases - for WebView - for instance -
> because of the fake location attribute available on WebViewBuilder
> only - and for any type which has no public constructors (e.g.: all 
> charts, Insets, etc...)
> However - SceneBuilder discovers whether there are constructor 
> properties by introspecting ClassX and ClassXBuilder and comparing
> the results: it takes the name of all the single parameter
> instance methods in ClassXBuilder which returns a builder,
> remove the names of all writable (getter+setter) properties
> found in ClassX, and what remain are assumed to be constructor 
> properties.
> As long as the convenience methods have more than 1 parameter
> (varargs count for 1)  then this logic should remain valid.
> The FXMLLoader's JavaFXBuilderFactory also introspects builders
> in order to find out writable properties and type of properties,
> so that's another place you will have to look at
> (class JavaFXBuilderFactory.JavaFXBuilder).
> best regards,
> -- daniel

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