In struts, How can I receive null for Boolean?

Question

e.g.

class TestAction
{
    @Getter @Setter
    Boolean enabled;// null for both
}

HTML

<input type='radio' name="enabled" value='true'> enabled
<input type='radio' name="enabled" value='false'> disabled
<input type='radio' name="enabled" value='null'> both
<!-- value=null will convert to false -->

How can I pass null for Boolean ?

UPDATE

Answer is impossible. I use another way below.

http://stackoverflow.com/questions/22255612/how-to-preserve-null-state-in-a-boolean-sending-an-empty-string-from-jsp-to-acti — Andrea Ligios, Apr 01 '14 at 12:44
`Boolean.valueOf("") == false`, The only way is custom the value. — wener, Apr 01 '14 at 13:04
See also [Struts2 s:if test for non-null value](http://stackoverflow.com/q/22248699/573032) question. — Roman C, Apr 01 '14 at 14:39

score 4 · Accepted Answer · answered Apr 01 '14 at 13:06

My way to around this.

@Data // Generate all setter and getter.
public class UserSearchCondition implements ISearchCondition
{
    private String enabled = null;

    public Boolean isEnabled()
    {
        if (Strings.isNullOrEmpty(enabled) || enabled.toLowerCase().equals("null"))
            return null;
        return Boolean.valueOf(enabled);
    }
}

In struts, How can I receive null for Boolean?

1 Answers1