Version 8.4.1 combobox.setItems(I... items) only adding first item

Flow
1 
class DatabaseTab extends VerticalLayout {
    public enum Operation {
        CREATE {public String toString() { return "Create"; }},
        READ {public String toString() { return "Read"; }},
        UPDATE {public String toString() { return "Update"; }},
        DELETE {public String toString() { return "Delete"; }}
    }
    private ComboBox<Operation> operationInput;
	//other data members

    DatabaseTab() {
        operationInput = new ComboBox<>();
        operationInput.setEmptySelectionAllowed(false);
        operationInput.setTextInputAllowed(false);
        operationInput.setItems(CREATE, DELETE);
        operationInput.setSelectedItem(CREATE);
        operationInput.addValueChangeListener(event -> handleOperationValueChange());
        addComponent(operationInput);
    }
	//other methods
}

What could be an explanation for the fact that the operationInput combobox only contains the CREATE element?
I’ve done a clean. I’ve even restarted my machine.
Vaadin 8.4.1, IntelliJ 2018.3.4, Tomcat 9.0.10, Maven 3.6.0, Java 1.8
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2

There has been number of bugfixes in ComboBox component since version 8.4.1. Especially recently released 8.8.0 fixes couple of severe issues. I would recommend to upgrade to 8.8.0 and re-test.

3

Unfortunately, updating to 8.8.0 didn’t solve the issue. I’ve been developing with version 8 for over a year and have never seen anything like this before.

4

It is really hard for me to say what your problem is then. I tried your code and it works for me.

5

It took me hours to discover that a few hundred lines of code later, for some stupid reason, I was doing this…
operationInput.setItems(CREATE);