我有一个测试，它为我的Spring boot 2 REST控制器类抛出了Could not instantiate JAXBContext for class [class org.springframework.hateoas.PagedResources]异常。我在这里错过了一些额外的设置，还是我没有正确地实施测试？
@RestController
public class BiodiversityController {
private final SpecieService specieService;
private final SpecieResourceAssembler speciePagedResourcesAssembler;
public BiodiversityController(SpecieService specieService, SpecieResourceAssembler speciePagedResourcesAssembler) {
this.specieService = specieService;
this.speciePagedResourcesAssembler = speciePagedResourcesAssembler;
}
@ResponseBody
public ResponseEntity<PagedResources<SpecieResource>> getAllSpecies(Pageable pageable, PagedResourcesAssembler<Specie> assembler){
Page<Specie> species = specieService.getAllSpecies(pageable);
PagedResources<SpecieResource> specieResources = assembler.toResource(species, speciePagedResourcesAssembler);
return ResponseEntity.ok(specieResources);
}
}
考试：
@RunWith(SpringRunner.class)
@WebMvcTest(BiodiversityController.class)
@Import(SpecieResourceAssembler.class)
public class BiodiversityControllerTest {
@MockBean
private SpecieService specieService;
@Autowired
private MockMvc mockMvc;
@Autowired
private SpecieResourceAssembler specieResourceAssembler;
@Before
public void setup() {
mockMvc = MockMvcBuilders.standaloneSetup(new
BiodiversityController(specieService, specieResourceAssembler))
.setCustomArgumentResolvers(new PageableHandlerMethodArgumentResolver())
.build();
}
@Test
public void getAllSpecies_ShouldReturnSpecies() throws Exception {
PageRequest pageRequest = PageRequest.of(0, 20);
given(specieService.getAllSpecies(pageRequest)).willReturn(new PageImpl<>(
Collections.singletonList(createAnimaliaOrestias()), pageRequest, 1));
mockMvc.perform(MockMvcRequestBuilders.get("/species?page=0&size=20"))
.andExpect(status().isOk())
.andExpect(jsonPath("$.content", hasSize(1)))
.andExpect(jsonPath("$.content.[0].name").value(NAME_ORESTIAS));
verify(specieService).getAllSpecies(pageRequest);
}
堆栈跟踪：
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Could not instantiate JAXBContext for class [class org.springframework.hateoas.PagedResources]: Implementation of JAXB-API has not been found on module path or classpath.; nested exception is javax.xml.bind.JAXBException: Implementation of JAXB-API has not been found on module path or classpath.
- with linked exception:
[java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)
at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:71)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:166)
at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:165)
at biodiversity.controller.BiodiversityControllerTest.getAllSpecies_ShouldReturnSpecies(BiodiversityControllerTest.java:64)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
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.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
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:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
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$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.http.converter.HttpMessageConversionException: Could not instantiate JAXBContext for class [class org.springframework.hateoas.PagedResources]: Implementation of JAXB-API has not been found on module path or classpath.; nested exception is javax.xml.bind.JAXBException: Implementation of JAXB-API has not been found on module path or classpath.
- with linked exception:
[java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory]
at org.springframework.http.converter.xml.AbstractJaxb2HttpMessageConverter.getJaxbContext(AbstractJaxb2HttpMessageConverter.java:116)
at org.springframework.http.converter.xml.AbstractJaxb2HttpMessageConverter.createMarshaller(AbstractJaxb2HttpMessageConverter.java:50)
at org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter.writeToResult(Jaxb2RootElementHttpMessageConverter.java:183)
at org.springframework.http.converter.xml.AbstractXmlHttpMessageConverter.writeInternal(AbstractXmlHttpMessageConverter.java:71)
at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:226)
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:275)
at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:224)
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:119)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)
... 40 more
Caused by: javax.xml.bind.JAXBException: Implementation of JAXB-API has not been found on module path or classpath.
- with linked exception:
[java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory]
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:278)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:421)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:721)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:662)
at org.springframework.http.converter.xml.AbstractJaxb2HttpMessageConverter.getJaxbContext(AbstractJaxb2HttpMessageConverter.java:111)
... 54 more
user987339开始思考，我找到了解决问题的方法。我首先将可分页支持添加到我的其余控制器，导致测试失败，以便解决它我添加了这个依赖项
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
<scope>test</scope>
在控制器中添加PagedResources支持后，添加的依赖项导致了此异常，因此只需删除它就可以解决问题。
对我来说最好的解决方案是使用maven-jaxb2-plugin
<!-- https://mvnrepository.com/artifact/org.jvnet.jaxb2.maven2/maven-jaxb2-plugin -->
<dependency>
<groupId>org.jvnet.jaxb2.maven2</groupId>
<artifactId>maven-jaxb2-plugin</artifactId>
<version>0.14.0</version>
</dependency>