validation - JSF2 Value is not valid when submitting zero

Question

I have read many posts about this JSF2 validation error, but cannot see why this is occurring. My select items are a List where ListItem is a POJO with two String fields, key, and value. When I submit the page choosing a select item option with a value of "0", I get the following error: Validation Error: Value is not valid.

The value to be submitted is bound to an int. Here is the equals method in ListItem, but I have a debug point on this method and it doesn't appear to get hit, so I can't see if this is the issue:

public boolean equals(Object other)
{
    if (other == null || !(other instanceof ListItem))
        return false;
    ListItem otherLI = (ListItem) other;
    return otherLI.key.equals(key);
}

Any ideas?

Answer 1

在 UISelectOne validateValue 方法中进行一些调试后似乎已修复它，当提交的值为 0 作为 Integer 对象时，SelectUtils.valueIsNoSelectionOption 似乎返回 true。

我的 noSelectionOption 如下：

<f:selectItem noSelectionOption="true" itemLabel="Please Select" itemValue="" />

将 itemValue 更改为 #{null} 后，它似乎工作正常。

<f:selectItem noSelectionOption="true" itemLabel="Please Select" itemValue="#{null}" />