[jsr-314-open] BeanValidator cannot resolve composite component values

Mon Oct 12 13:52:57 EDT 2009

I've logged an issue for this:
https://javaserverfaces.dev.java.net/issues/show_bug.cgi?id=1360

When baseClass is:
    class com.sun.faces.el.CompositeComponentAttributesELResolver
$ExpressionEvalMap

BeanValidator.isResolvable(...) returns false because ExpressionEvalMap
is a Map -- and never attempts to traverse the composite component.

This is a big problem with Bean Validation support, since probably the
most attractive feature of JSF2 is composite components, and this means
BeanValidation will not function at all within any composite components.

            // case 1, base classes of Map, List, or Array are not
resolvable
            if (null != baseClass) {
                if (Map.class.isAssignableFrom(baseClass) ||
                        Collection.class.isAssignableFrom(baseClass) ||
                        Array.class.isAssignableFrom(baseClass)) {
                    failureMessage = "Unable to validate expression " +
valueExpression.getExpressionString() +
                            " using Bean Validation.  Expression
evaluates to a Map, List or array.";
                    result = false;
                }
            }

This can be reproduced by using the following component, and an Object
annotated with JSR303 annos.
Consuming page: (I've also tried "value" as the for="..." attribute
value with no success)

        <h:form>

                <a:comp id="test" value="${bean.test.text}">
                	<f:validateBean for="#{bean.test}"/>
                </a:comp>

        </h:form>

Example component:

        <html xmlns="http://www.w3.org/1999/xhtml"
        	xmlns:h="http://java.sun.com/jsf/html"
        	xmlns:f="http://java.sun.com/jsf/core"
        	xmlns:a="http://java.sun.com/jsf/composite/ajax"
        	xmlns:ui="http://java.sun.com/jsf/facelets"
        	xmlns:composite="http://java.sun.com/jsf/composite">

        <composite:interface>
        	<composite:attribute name="value" required="true"
        type="Object" />
        	<composite:editableValueHolder name="value" targets="value" />
        </composite:interface>

        <composite:implementation>
        	<h:message id="inputErr" for="input"/><br/>
        	<h:inputText id="input" value="#{cc.attrs.value}" >
        		<f:ajax execute="@this" render="@this inputErr" />
        	</h:inputText>
        </composite:implementation>

        </html>

Example Object:

        public class ValidationCriteria
        {
            @Size(min=4, max=255)
            private String text;

            public String getText()
            {
                return text;
            }

            public void setText(final String validation)
            {
                this.text = validation;
            }
        }

ExampleBean

@ManagedBean
public class Bean
{
    private ValidationCriteria test = new ValidationCriteria();

    public ValidationCriteria getTest()
    {
        return test;
    }
}

--
Lincoln Baxter, III
Co-Founder of OcpSoft

Creator of:
PrettyFaces: URL rewriting for JSF
PrettyTime: Java elapsed timestamp formatting

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