Java Spring Junit测试因NullPointerException失败
我正在为我的RESTAPI端点编写JUnit,我已经为它创建了一个简单的hello world控制器类和JUnit,但是我在执行JUnit测试用例时遇到了以下异常。如果有人能帮我解决这个问题,那将非常有帮助。我在Spring4.3版本中使用JDK6 注意:我没有使用spring上下文XML—我使用的是Java注释 HelloController.javaJava Spring Junit测试因NullPointerException失败,java,spring,rest,junit,Java,Spring,Rest,Junit,我正在为我的RESTAPI端点编写JUnit,我已经为它创建了一个简单的hello world控制器类和JUnit,但是我在执行JUnit测试用例时遇到了以下异常。如果有人能帮我解决这个问题,那将非常有帮助。我在Spring4.3版本中使用JDK6 注意:我没有使用spring上下文XML—我使用的是Java注释 HelloController.java @RestController @RequestMapping("/hello") public class HelloController
@RestController
@RequestMapping("/hello")
public class HelloController {
@GetMapping
public String helloWorld() {
return "hello World";
}
}
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {HelloController.class})
public class HelloControllerTest {
private MockMvc mockMvc;
@InjectMocks
private HelloController helloController;
@Before
public void setUp() throws Exception {
mockMvc = MockMvcBuilders.standaloneSetup(helloController).build();
}
@Test
public void testHelloWorld() throws Exception {
mockMvc.perform(MockMvcRequestBuilders.get("/hello")).andExpect(MockMvcResultMatchers.status().isOk())
.andExpect(MockMvcResultMatchers.content().string("hello World"));
}
}
HelloControllerTest.java
@RestController
@RequestMapping("/hello")
public class HelloController {
@GetMapping
public String helloWorld() {
return "hello World";
}
}
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {HelloController.class})
public class HelloControllerTest {
private MockMvc mockMvc;
@InjectMocks
private HelloController helloController;
@Before
public void setUp() throws Exception {
mockMvc = MockMvcBuilders.standaloneSetup(helloController).build();
}
@Test
public void testHelloWorld() throws Exception {
mockMvc.perform(MockMvcRequestBuilders.get("/hello")).andExpect(MockMvcResultMatchers.status().isOk())
.andExpect(MockMvcResultMatchers.content().string("hello World"));
}
}
例外情况:
java.lang.NullPointerException
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:227)
at org.springframework.test.web.servlet.setup.StandaloneMockMvcBuilder$StaticRequestMappingHandlerMapping.registerHandlers(StandaloneMockMvcBuilder.java:486)
at org.springframework.test.web.servlet.setup.StandaloneMockMvcBuilder.registerMvcSingletons(StandaloneMockMvcBuilder.java:352)
at org.springframework.test.web.servlet.setup.StandaloneMockMvcBuilder.initWebAppContext(StandaloneMockMvcBuilder.java:337)
at org.springframework.test.web.servlet.setup.AbstractMockMvcBuilder.build(AbstractMockMvcBuilder.java:139)
at HelloControllerTest.setUp(HelloControllerTest.java:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)
我得到了它-在setUp()中-没有实例化HelloController,在添加了下面一行之后,我的测试用例通过了
helloController = new HelloController();
如果您使用的是
standaloneSetup
,则不需要使用SpringJUnit4ClassRunner
运行它。该运行程序需要一个Spring配置
您可以自己初始化一个新的HelloController
e、 g
或者,您也可以通过注入WebApplicationContext并使用创建WebApplicationContext所需的任何配置来构建它,让Spring来实现这一点
@RunWith(SpringRunner.class)
@ContextConfiguration(classes = MyWebApplicationConfig.class)
public class HelloControllerTest {
@Autowired
private WebApplicationContext wac;
private MockMvc mockMvc;
private HelloController helloController;
@Before
public void setUp() throws Exception {
mockMvc = MockMvcBuilders.webAppContextSetup(wac).build();
}
最后,如果您碰巧使用Spring Boot,您可以使用他们的一个切片测试注释
@RunWith(SpringRunner.class)
@WebMvcTest
public class HelloControllerTest {
@Autowired
private MockMvc mockmvc;
}
可能是@ErvinSzilagyi的重复我尝试了ContextConfiguration,但现在我得到了一个不同的错误-更新了我的原始帖子你也可以去掉测试的第1、2、7和8行,因为它们在你的情况下没有任何用处