spring MVC应用程序Junit测试用例失败

Question

我的JUnit测试用例失败了。行出现错误

mockito.When（BlogEntryService.Find(1L)).ThenReturn（entry）；

故障跟踪是

java.lang.NullPointerException位于com.sample.controller.BlogentryControllerTest.GetExistingBlogEntry(BlogentryControllerTest.java:72)位于Sun.Reflect.NativeMethodAccessorImpl.Invoke0（原生方法）位于Sun.Reflect.NativeMethodAccessorImpl.Invoke（未知源）位于Sun.Reflect.DelegatingMethodAccessorImpl.Invoke（未知源）位于java.lang.Reflect.MethodInvoke（TMethodCallbacks.evalue(RunAfterTestMethodCallbacks.Java:83)位于org.springFramework.test.context.junit4.statements.springRepeat.evalue(SpringRepeat.Java:72)位于org.springFramework.test.context.junit4.springJunit4ClassRunner.runchild(SpringJunit4ClassRunner.runchild(SpringJunit4ClassRunner.:233)位于R.Run（ParentRunner.Java:363)在org.springframework.test.context.junit4.springjunit4classrunner上运行（SpringJunit4classrunner.Java：176）在org.eclipse.jdt.internal.junit4.runner.junit4testreference上运行（Junit4testreference.Java：50）在org.eclipse.jdt.internal.junit.runner.testexecution.run（Testexecution.Java:38)在

在我看来，blogEntryService似乎为空

我的密码是

    /**
 * TODO - Describe purpose and operation of class.
 * 
 * <table border="1" cellpadding="0" cellspacing="0" width="100%">
 * <caption align="center">Edit and Version History</caption>
 * <tr><th>Version</th><th>Date</th><th>Author</th><th>Description</th></tr>
 * <tr><td>1.0</td><td>Jan 17, 2016</td><td>EOV537</td><td>Initial creation.</td></tr>
 * </table>
 */
package com.sample.controller;

import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.forwardedUrl;

import org.hamcrest.Matchers;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.MockitoAnnotations;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;

import com.sample.config.ApplicationConfig;
import com.sample.model.BlogEntry;
import com.sample.service.BlogEntryService;

/**
 * @author EOV537 -
 * @since 1.0
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {ApplicationConfig.class})
@WebAppConfiguration
public class BlogEntryControllerTest {

    private MockMvc mockMvc;

    @InjectMocks
    private BlogEntryController blogentryconttroller;

    @Mock
    private BlogEntryService blogEntryService;

    @Autowired
    private WebApplicationContext appCtx;

    @Before
    public void setup() {

        MockitoAnnotations.initMocks(BlogEntryControllerTest.class);
        mockMvc = MockMvcBuilders.webAppContextSetup(appCtx).build();
    }

    @Test
    public void getExistingBlogEntry() throws Exception {

        BlogEntry entry = new BlogEntry();
        entry.setId(1L);
        entry.setTitle("Test Title");

        Mockito.when(blogEntryService.find(1L)).thenReturn(entry);

        mockMvc.perform(MockMvcRequestBuilders.get("/rest/blog-entries/1"))
                .andExpect(MockMvcResultMatchers.jsonPath("$.title", Matchers.is("Test Title")))
                .andExpect(
                        MockMvcResultMatchers.jsonPath("$.links[*].href",
                                Matchers.hasItem(Matchers.endsWith("/blog-entries/1"))))
                .andExpect(MockMvcResultMatchers.status().isOk());
    }

    public void getNonExistingBlogEntry() throws Exception {

        Mockito.when(blogEntryService.find(1L)).thenReturn(null);
        mockMvc.perform(MockMvcRequestBuilders.get("/rest/blog-entries/1")).andExpect(
                MockMvcResultMatchers.status().isNotFound());
    }



}

BlogEntryController.java

package com.sample.controller;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.sample.assembler.BlogEntryResourceAsm;
import com.sample.model.BlogEntry;
import com.sample.resource.BlogEntryResource;
import com.sample.service.BlogEntryService;

/**
 * @author EOV537 -
 * @since 1.0
 */
@Controller
@RequestMapping(value = "/rest/blog-enteries")
public class BlogEntryController {

    public BlogEntryController() {

    }

    public BlogEntryController(BlogEntryService blogEntryService) {

        this.blogEntryService = blogEntryService;
    }

    private BlogEntryService blogEntryService;

    @RequestMapping(value = "/{blogEntryId}", method = RequestMethod.GET)
    public ResponseEntity<BlogEntryResource> getExsitingBlogEntry(@PathVariable Long blogEntryId) {

        BlogEntry entry = blogEntryService.find(blogEntryId);

        if (entry != null) {
            BlogEntryResource res = new BlogEntryResourceAsm().toResource(entry);
            return new ResponseEntity<BlogEntryResource>(res, HttpStatus.OK);
        } else {
            return new ResponseEntity<BlogEntryResource>(HttpStatus.NOT_FOUND);
        }
    }

}

BlogEntryService.java

package com.sample.service;

import org.springframework.stereotype.Component;

import com.sample.model.BlogEntry;

/**
 * @author EOv537 -
 * 
 * @since 1.0
 */

public interface BlogEntryService {
    public BlogEntry find(Long id);
}

BlogEntryResource.java

package com.sample.resource;

import org.springframework.hateoas.ResourceSupport;

/**
 * @author EOv537 -
 * @since 1.0
 */
public class BlogEntryResource extends ResourceSupport {

    private String title;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

}

BlogEntryResourceasM.java

public class BlogEntryResourceAsm extends ResourceAssemblerSupport<BlogEntry, BlogEntryResource> {

    /**
     * @param controllerClass
     * @param resourceType
     */
    public BlogEntryResourceAsm() {
        super(BlogEntryController.class, BlogEntryResource.class);
        // TODO Auto-generated constructor stub
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.springframework.hateoas.ResourceAssembler#toResource(java.lang.Object)
     */
    @Override
    public BlogEntryResource toResource(BlogEntry blogEntry) {

        BlogEntryResource res = new BlogEntryResource();
        res.setTitle(blogEntry.getTitle());
        Link link = ControllerLinkBuilder.linkTo(BlogEntryController.class).slash(blogEntry.getId()).withSelfRel();
        return res;

    }
}

ApplicationConfig.java

/**
 * TODO - Describe purpose and operation of class.
 * 
 * <table border="1" cellpadding="0" cellspacing="0" width="100%">
 * <caption align="center">Edit and Version History</caption>
 * <tr><th>Version</th><th>Date</th><th>Author</th><th>Description</th></tr>
 * <tr><td>1.0</td><td>Jan 17, 2016</td><td>EOV537</td><td>Initial creation.</td></tr>
 * </table>
 */
package com.sample.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

/**
 * @author EOV537 -
 * @since 1.0
 */
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = {"com.sample"})
public class ApplicationConfig extends WebMvcConfigurerAdapter {

    private static final String VIEW_RESOLVER_PREFIX = "/WEB-INF/jsp/";

    private static final String VIEW_RESOLVER_SUFFIX = ".jsp";

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**").addResourceLocations("/static/");
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();

        // viewResolver.setViewClass(InternalResourceViewResolver.class); // NOSONAR
        viewResolver.setPrefix(VIEW_RESOLVER_PREFIX);
        viewResolver.setSuffix(VIEW_RESOLVER_SUFFIX);

        return viewResolver;
    }

}

webapplint.java

/**
 * TODO - Describe purpose and operation of class.
 * 
 * <table border="1" cellpadding="0" cellspacing="0" width="100%">
 * <caption align="center">Edit and Version History</caption>
 * <tr><th>Version</th><th>Date</th><th>Author</th><th>Description</th></tr>
 * <tr><td>1.0</td><td>Jan 17, 2016</td><td>EOV537</td><td>Initial creation.</td></tr>
 * </table>
 */
package com.sample.config;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;

import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

/**
 * @author EOV537 -
 * @since 1.0
 */
public class WebApplint implements WebApplicationInitializer {
    /*
     * (non-Javadoc)
     * 
     * @see org.springframework.web.WebApplicationInitializer#onStartup(javax.servlet.ServletContext)
     */
    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {

        AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
        rootContext.register(ApplicationConfig.class);

        ServletRegistration.Dynamic registration = servletContext.addServlet("DispatcherServlet",
                new DispatcherServlet(rootContext));

        registration.addMapping("/");

        registration.setLoadOnStartup(1);
        servletContext.addListener(new ContextLoaderListener(rootContext));

    }
}

Answer 1

private MockMvc mockMvc;

@Autowired
@InjectMocks
private BlogEntryController blogentryconttroller;

@Autowired
private WebApplicationContext appCtx;

@Mock
BlogEntryService blogEntryService;

@Before
public void setup() {
    MockitoAnnotations.initMocks(BlogEntryControllerTest.this);
    mockMvc = MockMvcBuilders.webAppContextSetup(appCtx).build();
}

@Test
public void getExistingBlogEntry() throws Exception {
    BlogEntry entry = new BlogEntry();
    entry.setId(1L);
    entry.setTitle("Test Title");
    Mockito.when(blogEntryService.find(1L)).thenReturn(entry);
    mockMvc.perform(MockMvcRequestBuilders.get("/rest/blog-enteries/1"))
            .andExpect(MockMvcResultMatchers.status().isOk());
}