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https://issues.apache.org/jira/browse/TAPESTRY-2254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12579091#action_12579091
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Kristian Marinkovic commented on TAPESTRY-2254:
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this issue was partly solved by
https://issues.apache.org/jira/browse/TAPESTRY-2260
> ValueEncoders created by HibernateEntityValueEncoder produces exceptions on
> empty clientValue
> ---------------------------------------------------------------------------------------------
>
> Key: TAPESTRY-2254
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2254
> Project: Tapestry
> Issue Type: Bug
> Components: tapestry-hibernate
> Affects Versions: 5.0.12
> Reporter: Kristian Marinkovic
> Priority: Critical
>
> the toValue() method of the ValueEncoder created by the
> HibernateEntityValueEncoder service tries coercing the clientValue to the
> primary key field type even if it is empty. this creates a coercion
> exception.
> public E toValue(String clientValue) {
> Class<?> idType = _idGetter.getReturnType();
> // cannot coerce if clientValue is empty
> Object id = _typeCoercer.coerce(clientValue, idType);
> Serializable ser = Defense.cast(id, Serializable.class, "id");
> return (E)_session.get(_entityClass, ser);
> }
> the created ValueEncoder should return null if the client Value is empty/null
> this situation arises when a select component is submitted with the blank
> option selected (see blankOption parameter of select component). as long as
> there is no required validator associated with the select box null is a valid
> value (a list of entities is used for the SelectModel).
> furthermore there is no way to override/decorate the
> HibernateEntityValueEncoder nor to exclude certain entities from having
> ValueEncoders created. this is useful when custom ValueEncoders are provided.
> in existing applications the custom ValueEncoders for the entities are
> quietly ignored.
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