Untitled

POJO, JPA bindings and checkboxes
<input id="object_isInvoiceable" type="checkbox" name="object.isInvoiceable" />
<input type="hidden" name="object.isInvoiceable" value="false" />

<input id="object_isInvoiceable" type="checkbox" name="isInvoiceableExtraParamFromHell" />

public static void save(Event object, Boolean isInvoiceableExtraParamFromHell) {
    if(isInvoiceableExtraParamFromHell == null) {
        object.isInvoiceable = false;
    }
    else {
        object.isInvoiceable = true;
    }

    ... validation etc ...

    object.save();

    ... render etc ...
}

public class Event extends Model {

    public Boolean isInvoiceable = Boolean.FALSE;
    ...
    ...
}

<input id="object_isInvoiceable_checkbox" type="checkbox" name="ignoredformfield" />
<input id="object_isInvoiceable_formfield" type="hidden" name="object.isInvoiceable" value="false" />

<script>$("#object_isInvoiceable_checkbox").click(function(
    $("object_isInvoiceable_formfield").value("$("#object_isInvoiceable_checkbox").is(":checked")");
));</script>

<input id="object_isInvoiceable" type="checkbox" name="object.isInvoiceable" />

public static void save(Event object) {
    if(params.get("object.isInvoiceable") == null) {
        object.isInvoiceable = false;
    }

    ... validation etc ...

    object.save();

    ... render etc ...
}