Java 必须至少存在一个JPA元模型

我在测试控制器类时遇到此异常

Caused by: java.lang.IllegalArgumentException: At least one JPA metamodel must be present!
    at org.springframework.util.Assert.notEmpty(Assert.java:450)
    at org.springframework.data.jpa.mapping.JpaMetamodelMappingContext.<init>(JpaMetamodelMappingContext.java:54)
    at org.springframework.data.jpa.repository.config.JpaMetamodelMappingContextFactoryBean.createInstance(JpaMetamodelMappingContextFactoryBean.java:88)
    at org.springframework.data.jpa.repository.config.JpaMetamodelMappingContextFactoryBean.createInstance(JpaMetamodelMappingContextFactoryBean.java:43)
    at org.springframework.beans.factory.config.AbstractFactoryBean.afterPropertiesSet(AbstractFactoryBean.java:141)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1761)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1698)

我的引导类

@SpringBootApplication(scanBasePackages = "com.javadroider")
@RestController
@EntityScan("com.javadroider.notifier.commons.model")
@EnableJpaRepositories(basePackages = "com.javadroider.notifier")
public class NotifierApplication {

    @GetMapping("/")
    public String home(){
        return "Welcome to Notifier";
    }

    public static void main(String[] args) {
        SpringApplication.run(NotifierApplication.class, args);
    }
}   

我的依赖项是这样的

@RunWith(SpringRunner.class)
@WebMvcTest(controllers = {SensorController.class}, secure = false)
public class SensorControllerTest {

    @Autowired
    private MockMvc mvc;

    @MockBean
    private SensorService sensorService;

    .....
}

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
            <scope>runtime</scope>
        </dependency>
</dependencies>

org.springframework.boot

没有解决我的问题
注释

@WebMvcTest不会为您自动配置任何存储库或JPA层bean，因为它主要集中于测试控制器级别

您的主类NotifierApplication尝试执行太多操作。有关良好编程实践，请参见单一责任原则：

main类应该仅用于定义应用程序，它本身不应该是

@RestController

。例如，创建一个单独的类NotifierController，并使其成为您的

@RestController

，其中定义了端点：

@RestController 
public class NotifierController {

    @GetMapping("/")
    public String home(){
        return "Welcome to Notifier";
    }

}

并将其与您的主要课程分开：

@SpringBootApplication(scanBasePackages = "com.javadroider")
@EntityScan("com.javadroider.notifier.commons.model")
@EnableJpaRepositories(basePackages = "com.javadroider.notifier")
public class NotifierApplication {

    public static void main(String[] args) {
        SpringApplication.run(NotifierApplication.class, args);
    }
} 

---

它失败的原因是，由于主类上的注释，您的WebMvcTest试图扫描JPA存储库和实体，但这不是为WebMvcTest配置的。

请添加您正在使用的依赖项看看这个：@MehrajMalik的可能重复并没有解决我的问题。