无法实例化可分页 Bean

java spring spring-mvc spring-data-jpa

2022-09-02 05:27:55

我使用Spring 4.1.6.RELEASE和Spring Data Jpa 1.8.0.RELEASE。我在 org.springframework.data.domain.Pageable bean creation 方面遇到了问题。它用于我的控制器：

@Controller
public class ItemsController {

    @Autowired
    ProductService itemsService;

    @RequestMapping(value = "/openItemsPage")
    public String openItemsPage() {
        return "items";
    }

    @RequestMapping(value = "/getItems", method = RequestMethod.GET)
    @ResponseBody
    public Item[] getItems(Pageable pageable) {

        return itemsService.getItems(pageable);
    }
}

此外，我在应用程序上下文中还有下一个xml配置：

<context:component-scan base-package="com.mobox.controller" />

<mvc:annotation-driven>
    <mvc:argument-resolvers>
        <beans:bean id="sortResolver"
                class="org.springframework.data.web.SortHandlerMethodArgumentResolver" />
        <beans:bean
                class="org.springframework.data.web.PageableHandlerMethodArgumentResolver">
            <beans:constructor-arg ref="sortResolver" />
        </beans:bean>
    </mvc:argument-resolvers>
</mvc:annotation-driven>

最后，我从客户那里做了下一个要求：

   $.ajax({
        type: "GET",
        url: "getProducts?page=0&size=100",
        .....

在tomcat日志中，我看到接下来：

    SEVERE: Servlet.service() for servlet [appServlet] in context with path [/a2delivery-web] threw exception [Request processing failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.domain.Pageable]: Specified class is an interface] with root cause
org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.domain.Pageable]: Specified class is an interface
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:101)
    at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:137)
    at org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:80)
    at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:106)
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:77)
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:162)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:129)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
    ....................

请帮我解决这个问题，谢谢！

答案 1

实现此目的的最简单方法是在配置中进行设置。或者，在基于 XML 的纯配置中，声明为 Spring Bean。@EnableSpringDataWebSupportSpringDataWebConfiguration

这将确保正确注册必要的内容。HandlerMethodArgumentResolver

答案 2

将以下内容添加到测试类中：

@Inject
private PageableHandlerMethodArgumentResolver pageableArgumentResolver;

PageableHandlerMethodArgumentResolver

并在 MockMvc 设置期间对其进行配置：

@Before
public void setup() {
    ...
    this.mockMvc = MockMvcBuilders.standaloneSetup(resource)
        .setCustomArgumentResolvers(pageableArgumentResolver)
        .build();
}