Sorted Editable Grid with new data (bean) throws NPE

Vaadin 6 / 7 / 8
1

I have a grid which is editable and should be sorted. Without sorting everything works fine. But when I add grid.sort(firstColumn); it bails out with a NPE when I add a new bean where the fields have null values.

[code]
Caused by: java.lang.NullPointerException: value cannot be null
at java.util.Objects.requireNonNull(Objects.java:228)[:1.8.0_111]

at com.vaadin.ui.AbstractTextField.setValue(AbstractTextField.java:96)
at com.vaadin.ui.AbstractTextField.setValue(AbstractTextField.java:46)
at com.vaadin.data.Binder$BindingImpl.initFieldValue(Binder.java:890)
at com.vaadin.data.Binder$BindingImpl.access$100(Binder.java:763)
at com.vaadin.data.Binder.lambda$readBean$11(Binder.java:1380)[218:com.vaadin.server:8.0.0]

at java.lang.Iterable.forEach(Iterable.java:75)[:1.8.0_111]

at com.vaadin.data.Binder.readBean(Binder.java:1380)[218:com.vaadin.server:8.0.0]

at com.vaadin.ui.components.grid.EditorImpl.doEdit(EditorImpl.java:224)
at com.vaadin.ui.components.grid.EditorImpl$1.bind(EditorImpl.java:150)
... 39 more

[/code]Can I set somewhere my own comparator which handles null values? Or is there any other workaround?

Thanks in advance.

Mihael

2

Yes, that is possible when you use ListDataProvider instance in Grid, it has a method addSortComparator()

https://vaadin.com/api/8.0.1/com/vaadin/data/provider/ListDataProvider.html#addSortComparator-com.vaadin.server.SerializableComparator-

Here is the interface you should extend

https://vaadin.com/api/8.0.1/com/vaadin/server/SerializableComparator.html

3

Thanks. That did the job.