隔离控制器测试无法实例化可分页 [英] Isolated Controller Test can't instantiate Pageable

问题描述

我有一个 Spring MVC 控制器，它使用 Spring-Data 的分页支持:

I have a Spring MVC Controller which uses Pagination Support of Spring-Data:

@Controller
public class ModelController {

    private static final int DEFAULT_PAGE_SIZE = 50;

    @RequestMapping(value = "/models", method = RequestMethod.GET)
    public Page<Model> showModels(@PageableDefault(size = DEFAULT_PAGE_SIZE) Pageable pageable, @RequestParam(
            required = false) String modelKey) {

//..
        return models;
    }

}

我想使用漂亮的 Spring MVC 测试支持来测试 RequestMapping.为了使这些测试保持快速并与所有其他事情隔离开来，我不想创建完整的 ApplicationContext:

And I'd like to test the RequestMapping using the nice Spring MVC Test Support. In order to keep these tests fast and isolated from all the other stuff going on, I do not want to create the complete ApplicationContext:

public class ModelControllerWebTest {
    private MockMvc mockMvc;

    @Before
    public void setup() {
        ModelController controller = new ModelController();
        mockMvc = MockMvcBuilders.standaloneSetup(controller).build();
    }

    @Test
    public void reactsOnGetRequest() throws Exception {
        mockMvc.perform(get("/models")).andExpect(status().isOk());
    }

}

这种方法可以很好地与其他不期望 Pageable 的控制器一起使用，但是通过这种方法，我得到了这些不错的长 Spring 堆栈跟踪之一.它抱怨无法实例化 Pageable:

This approach works fine with other Controllers, that do not expect a Pageable, but with this one I get one of these nice long Spring stacktraces. It complains about not being able to instantiate Pageable:

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.data.domain.Pageable]: Specified class is an interface
at   
.... lots more lines

问题:如何更改我的测试，以便神奇的 No-Request-Parameter-To-Pageable 转换正确发生?

Question: How do I change my test so the magic No-Request-Parameter-To-Pageable conversion happens properly?

注意:在实际应用中一切正常.

Note: In the actual application everything is working fine.

推荐答案

原答案:

pageable 的问题可以通过提供自定义参数处理程序来解决.如果设置了此项，您将在 ViewResolver 异常(循环)中运行.为避免这种情况，您必须设置一个 ViewResolver(例如匿名 JSON ViewResolver 类).

The problem with pageable can be solved by providing a custom argument handler. If this is set you will run in a ViewResolver Exception (loop). To avoid this you have to set a ViewResolver (an anonymous JSON ViewResolver class for example).

mockMvc = MockMvcBuilders.standaloneSetup(controller)
            .setCustomArgumentResolvers(new PageableHandlerMethodArgumentResolver())
            .setViewResolvers(new ViewResolver() {
                @Override
                public View resolveViewName(String viewName, Locale locale) throws Exception {
                    return new MappingJackson2JsonView();
                }
            })
            .build();

更新(2020 年):不再需要添加 ViewResolver.

关于平行答案:在没有 ApplicationContext 和/或朋友的情况下运行此测试并不能解决原始问题的问题.

Regarding the parallel answer: It does not solve the problem for the original question to have this test running without ApplicationContext and/or friends.

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