Eclipse RCP Data Binding with WritableValue - Int vs. Integer

Question

I'm using Eclipse RCP 4 and I've little problem with my WritableValue :

I use the WritableValue in a data binding (see below) and whenever I set the value of my WritableValue with an object that contains an int attribute (part of the binding), then I receive a ClassCastException :

Caused by: java.lang.ClassCastException: Cannot cast java.lang.Integer to int
 at java.lang.Class.cast(Unknown Source)
 at org.eclipse.core.internal.databinding.beans.PojoValueProperty.doGetValue(PojoValueProperty.java:62)
 at org.eclipse.core.databinding.property.value.ValueProperty.getValue(ValueProperty.java:60)
 at org.eclipse.core.internal.databinding.property.value.SimplePropertyObservableValue.notifyIfChanged(SimplePropertyObservableValue.java:119)
 at org.eclipse.core.internal.databinding.property.value.SimplePropertyObservableValue.doGetValue(SimplePropertyObservableValue.java:101)
 at org.eclipse.core.databinding.observable.value.AbstractObservableValue.getValue(AbstractObservableValue.java:81)
 at org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableValue.doGetValue(DetailObservableValue.java:150)
 at org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableValue$2.handleValueChange(DetailObservableValue.java:96)
 at org.eclipse.core.databinding.observable.value.ValueChangeEvent.dispatch(ValueChangeEvent.java:71)
 at org.eclipse.core.databinding.observable.ChangeManager.fireEvent(ChangeManager.java:127)
 at org.eclipse.core.databinding.observable.value.AbstractObservableValue.fireValueChange(AbstractObservableValue.java:76)
 at org.eclipse.core.databinding.observable.value.WritableValue.doSetValue(WritableValue.java:94)
 at org.eclipse.core.databinding.observable.value.AbstractObservableValue.setValue(AbstractObservableValue.java:60)

This is my binding:

IObservableValue<?> model2 = PojoProperties.value(PlantBE.class,
            "maxAge").observeDetail(getModel().getWritableValue());
ISWTObservableValue<String> view2 = WidgetProperties.textText(SWT.Modify)
            .observe(getDialogView().getTxtMaxAge().getText());
this.getDataBindingContext().bindValue(model2, view2);

The Entity (PlantBE) looks like that:

public class PlantBE implements Serializable {
private int maxAge;

public int getMaxAge() {
    return maxAge;
}

public void setMaxAge(int maxAge) {
    this.maxAge = maxAge;
}
}

It would be great to get some help on that. Maybe you've an idea what the issue could be.

Thanks and best regards

Answer 1

What does the getModel().getWritableValue() return? Why wouldn't you do it like this:

IObservableValue model= BeanProperties.value(PlantBE.class,"maxAge").observe(model);
IObservableValue view = WidgetProperties.text(SWT.Modify).observe(getDialogView().getTxtMaxAge());
this.getDataBindingContext().bindValue(model, view);

ALso, take a look at this holy Eclipse RCP grail, aka Vogella's tutorial , it should help you a lot understanding this whole data binding mess.