依赖性不好

Question

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>

我的课程：

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);
    }


}

我得到了奇怪的错误：

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与控制器连接：8080 / meetings / hello我得到错误：

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，如果我删除了spring-context依赖关系，那么测试传递得很好，但是控制器得到了不同的错误，他无法自动连接一些bean。

我是Spring数据的新手，还有Spring mvc。我知道如何编写实体，控制器和ropositories类，但我仍然遇到配置问题。你知道为什么测试在删除依赖项之后有效，为什么不使用它呢？最后如何让它一起工作？

Answer 1

也许在intellij中有这样一棵树：

如何阅读这样的树？您会注意到有一个ehcache-spring-annotation（从底部开始的第4个）需要先前版本的slf4j-api（版本1.6.2中从底部开始的第3个版本）。但是更新版本的slf4j-api是硬编码的（从上面开始）。

现在，当在clearMetadataCache中删除版本1.6.1中的方法1.6.6的示例中的slf4j时，会抛出此类NoSuchMethodError。

Answer 2

由于错误日志表明Spring无法自动装配MeetingController，因为它无法自动装配MeetingRepository。因此，如果您已添加@Repository以确保Spring可以自动装配它，或者确保Spring将扫描组件包，请检查MeetingRepository实现。

Answer 3

您应该考虑使用Spring IO Platform，它应该解决有关spring依赖项的版本问题。

有关详细信息，请参阅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 repsitories非常简单和强大。在这种情况下，EntityManager依赖关系不是必需的。