Radiogroup with Enum value and option with NULL value

[nquirynen]

Hi,

I have a RadioGroup with options based on an enum (Language).

*.tml*

<t:radiogroup t:value="selectedLanguage">
      <t:loop t:source="languages" t:value="loopLanguage">
          <t:radio t:value="language" />
${format:labeled=language.description}
      </t:loop>
</t:radiogroup>

*.class*

@Property
private Language selectedLanguage;

@Property
private Language loopLanguage;

public Language[] getLanguages() {
   return new Language[] { Language.NL, Language.FR, Language.DE };
}

Now I want to add a radio option representing a null value (no language
selected);

So I added this to my radiogroup (after the loop):

<t:radio t:value="null" /> ${message:unknown}


Then I get this exception:

/org.apache.tapestry5.ioc.util.UnknownValueException
Input 'on' does not identify a value from enumerated type
be.pensionarchitects.admindb.model.language.Language.

availableValues

    be.pensionarchitects.admindb.model.language.Language enum constants:

        DE
        EN
        FR
        NL/

I understand the problem here. But seeing my use case, is the only solution
to use a String and the Language enum String representations as values for
my radiogroup? Or can this be solved in an other way?

Nathan






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