pre-selected value in combobox not working

Vaadin 6 / 7 / 8 Framework Data Binding
1

I’m showing a collection of beans in a combobox.
When creating the combobox, I want to preselect the previously saved selection. This bean (called “selectedBean” in the example below) is retrieved in a different hibernate-transaction than the bean-collection and therefore is not the same instance as the matching object in the collection.
I implemented the equals-method for Type “MyBeanType” and expected this to work:

        List<MyBeanType> beans = myService.findAll();
        myBeanContainer = new BeanItemContainer<MyBeanType>(MyBeanType.class);
        myBeanContainer.addAll(beans);
        view.setContainer(myBeanContainer); //view sets container and selected value on combobox
        view.setSelectedBean(selectedBean);

But strangely no value is selected!
But when I change my code to this, it works:

List<MyBeanType> beans = myService.findAll(); for (MyBeanType beanInCollection : beans) { if (beanInCollection.equals(selectedBean)) selectedBean = beanInCollection; } myBeanContainer = new BeanItemContainer<MyBeanType>(MyBeanType.class); myBeanContainer.addAll(beans); view.setContainer(myBeanContainer); view.setSelectedBean(selectedBean); The value in the collection corresponding “selectedBean” is selected correctly. That means my equals-method is working. But somehow it is not used by vaadin to identify the selected value. Why is that? What am I missing?

2

Did you remember to override hashCode() as well?

3

Thank you Anna, that was my problem.

simple question…simple answer.