ExtVal: NullPointerException for meta data of UIViewParameter

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I'm using Facelets for a JSF 2.0 project with redirect and view params:

<ui:composition template="/resources/templates/template.xhtml">
        
                <ui:define name="metadata">
                        <f:metadata>
                                <f:viewParam name="refID" 
value="#{bean.data.refID}" />
                        </f:metadata>
                </ui:define>

                <ui:define name="workspace">

                        <h:form id="inputForm"> 
                                <h:inputText id="refInput" 
value="#{bean.data.refID}" />        
                                <h:commandButton id="submitButton" 
value="Suchen"
                                        
action="list?faces-redirect=true&amp;includeViewParams=true" />                 
        
                        </h:form>       

                </ui:define>
        </ui:composition>

Using ExtVal and BeanValidation I receive a NPE evaluating on the view param 
which seems to be a JSF problem rather than ExtVal itself!?

org.apache.myfaces.extensions.validator.beanval.util.BeanValidationUtils.addMetaDataToContext(UIComponent,
 PropertyDetails, boolean)
-->
org.apache.myfaces.extensions.validator.core.el.DefaultELHelper.getPropertyDetailsOfValueBinding(UIComponent)
-->
javax.faces.component.UIComponent.getValueExpression(String) returns null for 
"UIComponentBase.PropertyKeys.bindings".

What is the problem here?


==========================================

Stacktrace:

java.lang.NullPointerException
        at 
org.apache.myfaces.extensions.validator.beanval.util.BeanValidationUtils.addMetaDataToContext(BeanValidationUtils.java:56)
        at 
org.apache.myfaces.extensions.validator.beanval.interceptor.ExtValBeanValidationMetaDataExtractionInterceptor.processExtValBeanValidationMetaData(ExtValBeanValidationMetaDataExtractionInterceptor.java:78)
        at 
org.apache.myfaces.extensions.validator.beanval.interceptor.ExtValBeanValidationMetaDataExtractionInterceptor.afterExtracting(ExtValBeanValidationMetaDataExtractionInterceptor.java:59)
        at 
org.apache.myfaces.extensions.validator.util.ExtValUtils.invokeMetaDataExtractionInterceptors(ExtValUtils.java:269)
        at 
org.apache.myfaces.extensions.validator.util.ExtValUtils.access$100(ExtValUtils.java:80)
        at 
org.apache.myfaces.extensions.validator.util.ExtValUtils$1.extract(ExtValUtils.java:237)
        at 
org.apache.myfaces.extensions.validator.core.interceptor.AbstractValidationInterceptor.getPropertyInformation(AbstractValidationInterceptor.java:173)
        at 
org.apache.myfaces.extensions.validator.core.interceptor.AbstractValidationInterceptor.processAfterValidation(AbstractValidationInterceptor.java:163)
        at 
org.apache.myfaces.extensions.validator.core.interceptor.AbstractValidationInterceptor.beforeGetConvertedValue(AbstractValidationInterceptor.java:150)
        at 
org.apache.myfaces.extensions.validator.core.renderkit.ExtValRendererWrapper.getConvertedValue(ExtValRendererWrapper.java:468)
        at 
javax.faces.component.UIViewParameter.getConvertedValue(UIViewParameter.java:391)
        at javax.faces.component.UIInput.validate(UIInput.java:934)
        at javax.faces.component.UIInput.executeValidate(UIInput.java:1189)
        at javax.faces.component.UIInput.processValidators(UIInput.java:691)
        at 
javax.faces.component.UIViewParameter.processValidators(UIViewParameter.java:270)
        at 
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1115)
        at 
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1115)
        at 
javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1180)

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