Tapestry 5: radio buttons coming back with value "on"

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I ran into a problem today where I was setting the value of a radio button in Tapestry 5 to a long field within a property. I was getting back the value “on” and Tapestry was crashing trying to coerce it into a long type. It turns out the value was null, and the default value for a radio button is “on”. So, if you encounter this, make sure your value fields are not null.

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