java - webflow评估表达式不调用方法

Question

在流程中:

<action-state id="create">
        <evaluate expression="operatore_rer" result="flowScope.operatore_rer" />
        <evaluate expression="mainService.getComuni()" result="flowScope.comuni_list" />
        <transition to="nuovo-operatore-rer" />
    </action-state>

评估表达式不调用方法 mainService.getComuni()

我必须在哪里以及如何声明 mainService？？？

如果我在 applicationContext 中声明它:

<bean id="mainService" class="com.aieap.services.MainService" />

这是错误:

GRAVE: StandardWrapper.Throwable
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mainService' defined in ServletContext resource [/WEB-INF/dispatch-servlet.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.aieap.services.MainService]: Specified class is an interface

帮帮我

Answer 1

将@Service("mainService")注释设置为实现MainService接口(interface)的类，并在bean中引用该类而不是接口(interface)。通过这种方式，bean 就被初始化了，您可以在 Web 流程中调用它。