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From "Kristian Marinkovic (JIRA)" <...@tapestry.apache.org>
Subject [jira] Created: (TAPESTRY-2254) ValueEncoders created by HibernateEntityValueEncoder produces exceptions on empty clientValue
Date Thu, 13 Mar 2008 08:47:46 GMT
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

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