Jsf 2 ValueExpression：如何获取基本对象？

ValueReference始终为空

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怎么了？

谢谢您的验证：

@FacesValidator("uniqueValidator")
public class UniqueValidator implements Validator
{
    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException
    {
        if(context == null)
        {
            throw new NullPointerException();
        }
        if(component == null)
        {
            throw new NullPointerException();
        }

        ValueExpression valueExpression = component.getValueExpression("value");
        if(valueExpression == null)
        {
            return;
        }

        ValueReference valueReference = valueExpression.getValueReference(context.getELContext());
        if(valueReference == null)
        {
            return;
        }

        Object base = valueReference.getBase();
        Object property = valueReference.getProperty();

        Tracer.out(base, property);

        .....
    }
}

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谢谢你，BeanValidator：

@FacesValidator("uniqueValidator")
public class UniqueValidator implements Validator
{
    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException
    {
        if(context == null)
        {
            throw new NullPointerException();
        }
        if(component == null)
        {
            throw new NullPointerException();
        }

        ValueExpression valueExpression = component.getValueExpression("value");
        if(valueExpression == null)
        {
            return;
        }

        ValueReference valueReference = valueExpression.getValueReference(context.getELContext());
        if(valueReference == null)
        {
            return;
        }

        Object base = valueReference.getBase();
        Object property = valueReference.getProperty();

        Tracer.out(base, property);

        .....
    }
}

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查看Omnifaces ExpressionSpector。在JSF2.x中，它似乎没有实现，并且总是返回null

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查看Omnifaces ExpressionSpector。在JSF2.x中，它似乎没有实现，并且总是返回null

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美好的但无法设置属性值：？！美好的但无法设置属性值：？！你注意到这个问题是8年前的事了吗？您是否注意到Omnifaces ExpressionSpector与BeanValidator的实现完全相同？您是否注意到这个问题是8年前提出的？您是否注意到Omnifaces ExpressionSpector与BeanValidator是完全相同的实现？