java.lang.String无法转换为javax.faces.component.UIComponent.

java.lang.String cannot be cast to javax.faces.component.UIComponent.

binding属性必须引用UIComponent，而不是普通香草String.的确，您忘记了属性值周围的#{}，因此将其视为普通香草String.

The binding attribute must refer an UIComponent, not a plain vanilla String. And indeed, you forgot the #{} around the attribute value which would make it to be treated as a plain vanilla String.

相应修复:

binding="#{saProductCategoryController.dtProductCategory}"