依赖关系不好用答案

【问题标题】：Dependencies not working well依赖关系不好用
【发布时间】：2016-03-06 23:59:23
【问题描述】：

我有一个项目，它使用 spring-mvc 和 spring-data 依赖项：

<dependencies>
    <!--Database dependencies-->
    <dependency>
        <groupId>postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>9.1-901-1.jdbc4</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>5.0.7.Final</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-jpa</artifactId>
        <version>1.9.4.RELEASE</version>
    </dependency>
    <!--Basic spring dependencies-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>4.2.5.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.2.5.RELEASE</version>
    </dependency>
    <!--Tests dependencies-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>4.2.5.RELEASE</version>
    </dependency>
    <!--Web dependencies-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.2.5.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
</dependencies>

我的课：

存储库：

@Transactional
public interface MeetingRepository extends JpaRepository<Meeting, Long> {
}

控制器：

@Controller@RequestMapping("/meetings")
public class MeetingController {


@Autowired
private MeetingRepository meetingRepository;


@RequestMapping("/hello")
public String helloWorld(Model model) {
    Meeting meeting = new Meeting();
    meeting.setAddedDate(new Date());
    meeting.setMeetingDate(new Date(System.currentTimeMillis() + 604800000)); //1 week later
    meeting.setNotes("My firt meeting.");
    meeting.setPlace("Room 200");

    meetingRepository.save(meeting);
    model.addAttribute("meeting", meeting);
    return "helloWorld2";
}
}

配置类：

  @Configuration
    @ComponentScan
    public class AppConfig {
    }

@Configuration
@EnableJpaRepositories(basePackages = "com.szymon.repository")
public class DataAccessConfig {

@Bean
public LocalEntityManagerFactoryBean entityManagerFactory() {
    LocalEntityManagerFactoryBean localEntityManagerFactoryBean = new LocalEntityManagerFactoryBean();
    localEntityManagerFactoryBean.setPersistenceUnitName("postgres");
    return localEntityManagerFactoryBean;
}

@Bean
public JpaTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
    JpaTransactionManager jpaTransactionManager = new JpaTransactionManager();
    jpaTransactionManager.setEntityManagerFactory(entityManagerFactory);
    return jpaTransactionManager;
}
}

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.szymon.controller")
public class WebMvcConfig {

    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setViewClass(JstlView.class);
        viewResolver.setPrefix("/WEB-INF/views/");
        viewResolver.setSuffix(".jsp");

        return viewResolver;
    }
}

public class WebInitializer implements WebApplicationInitializer {
public void onStartup(ServletContext container) throws ServletException {

    AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
    ctx.register(WebMvcConfig.class);
    ctx.setServletContext(container);

    ServletRegistration.Dynamic servlet = container.addServlet("dispatcher", new DispatcherServlet(ctx));

    servlet.setLoadOnStartup(1);
    servlet.addMapping("/");
}
}

当我尝试测试存储库时：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = DataAccessConfig.class)
public class MeetingRepositoryTest {

    @Autowired
    private MeetingRepository meetingRepository;

    @Test
    public void test() {
        Meeting meeting = new Meeting();
        meeting.setAddedDate(new Date());
        meeting.setMeetingDate(new Date(System.currentTimeMillis() + 604800000));
        meeting.setNotes("My first meeting.");
        meeting.setPlace("Room 200");

        meetingRepository.save(meeting);
        Assert.assertTrue(true);
    }


}

我遇到了奇怪的错误：

java.lang.NoSuchMethodError: org.springframework.beans.factory.config.ConfigurableListableBeanFactory.clearMetadataCache()V
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:185)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:678)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:520)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:125)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:109)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:261)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:117)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:228)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:230)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:249)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89)
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:193)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)

另外，如果我尝试使用 localhost:8080/meetings/hello 连接到控制器，我会收到错误：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:980)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:859)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.NullPointerException
    com.szymon.controller.MeetingController.helloWorld(MeetingController.java:33)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:497)
    org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:817)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:731)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:968)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:859)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

但最奇怪的是，如果我删除 spring-context 依赖项，则测试通过良好，但控制器得到不同的错误，他无法自动装配一些 bean。

我是 Spring 数据和 Spring mvc 的新手。我知道如何编写实体、控制器和存储库类，但我仍然有配置问题。您知道为什么在删除该依赖项后测试可以工作，为什么不使用它？最后如何让它一起工作？

【问题讨论】：

如果我是你，我会检查你的版本。
@GermannArlington 你是什么意思？我应该寻找什么来检测什么不起作用？
你在用eclipse吗？
@PeterRader 不，我正在使用 Intellij
检查 pom 文件中 postgresql、org.hibernate 和 org.springframework.data（可能还有 org.springframework）之间的依赖版本兼容性。您的错误似乎是由不兼容问题引起的

标签： java spring spring-mvc junit spring-data

【解决方案1】：

也许在 intellij 中有这样一棵树：

如何阅读这样的树？您会注意到 ehcache-spring-annotation（倒数第 4 个）需要以前版本的 slf4j-api（版本 1.6.2 中倒数第 3 个）。但是较新版本的 slf4j-api 是硬编码的（上面的第一个）。

现在，当示例中的 slf4j 在版本 1.6.1 中具有在 1.6.6 中删除的方法 clearMetadataCache 时，会抛出这样的 NoSuchMethodError。

【讨论】：

这不是答案，它解释了NoSuchMethodError 的奇怪之处

【解决方案2】：

正如错误日志所说，Spring 无法自动装配 MeetingController，因为它无法自动装配 MeetingRepository。所以检查 MeetingRepository 的实现是否你已经添加了@Repository 以确保 Spring 可以自动装配它，或者确保 Spring 将扫描组件包。

【讨论】：

【解决方案3】：

您应该考虑使用 Spring IO 平台，它应该可以解决有关 spring 依赖项的版本问题。

详情见enter link description here。另外要么使用 spring-data-jpa 要么不使用它。我会使用它，spring-data 存储库非常简单且功能强大。在这种情况下，EntityManager 依赖项是不必要的。

【讨论】：