CustomField getType()

Marek Michalowski

Hi,

I've created CustomField like this:

public class SupListEditor<T> extends CustomField<List<T>>{
...
}

What getType method should return to work?

@Override
    public Class<? extends List<T>> getType() {
        return (Class<? extends List<T>>) List.class;
//        return (Class<? extends List<T>>) (new ArrayList<T>()).getClass();
    }

Story behind is, that in Eclipse sometimes I get build error if used return from line 3, but it still works afrer trying to build app again, and form works correctly, BUT in Netbeans line 3 gives arror of incompatible types in IDE,
so I found in Vaadin book examples line 4. which gives runtime error (both Eclipse and Netbeans):

com.vaadin.data.util.converter.Converter$ConversionException: Unable to convert value of type org.eclipse.persistence.internal.indirection.jdk8.IndirectList to presentation type class java.util.List.

When I swich from EclipseLink to Hibernate nothing really changes, still there is runtime error of same meaning.

Any help?

Agata Vackova

Try to check all your imports for List. It's easy to accept a strange import hint from IDE ;-)

And, for me, works following getType method:

@Override
    public Class<? extends List<T>> getType() {
        //http://stackoverflow.com/questions/4829576/javac-error-inconvertible-types-with-generics
        Class clazz = List.class;
        return (Class<? extends List<T>>)clazz;
    }

Marek Michalowski

Hi Agata,

Your solution works great, both in Eclipse and Netbeans, build runs without any problems ;-)

Thank you very much good lady :-)

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CustomField getType()

Vaadin lets you build secure, UX-first PWAs entirely in Java.
Free ebook & tutorial.