java - bean类无效属性 'dao'的原因

Question

在 applicationContext_dao 中，我得到了 bean classNameDao，现在我尝试创建一个 BUS 层并向 applicationContext_bus 添加两个 bean。

<bean id="classNameValidator" class="cz.mikros.w4.model.bus.validator.ClassNameValidator">
        <property name="dao" ref="classNameDao" />
</bean>

<bean id="classNameBus" class="cz.mikros.w4.model.bus.impl.ClassNameBusImpl">
    <property name="dao" ref="classNameDao" />
    <property name="validator" ref="classNameValidator" />
</bean>

问题是

Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'dao' of bean class [path.model.bus.validator.ClassNameValidator]: Bean property 'dao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?

你能告诉我问题出在哪里吗？

Answer 1

检查您的path.model.bus.validator.ClassNameValidator是否在dao上有公共(public)setter方法。它应该被称为public void setDao(DAO dao)