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嵌套异常是java.lang.IllegalArgumentException: Not a managed type: class。

springspring-bootspring-dataspring-data-jpaspring-restcontroller
15
我正在尝试使用Spring Boot应用程序部署服务，该服务访问连接到PostgreSQL DB的JpaRepository，使用JPA和Hibernate在运行时引用src/main/resources/application.properties中的连接属性。但是，当我将构建的.WAR部署到Tomcat上时，应用程序无法启动，并显示下面错误日志中给出的错误信息。请问有谁可以帮忙解释一下这个错误的含义？请注意，我已经标注了MyServiceImpl和MyRequestBody类中的问题点，但由于我对Spring框架是新手，所以并不清楚这个错误的确切原因。
我的Spring Boot Starter项目中相关类的定义如下：

Spring Boot应用程序

@SpringBootApplication
@ComponentScan(<root package name under which all subpackages containing relevant classes >)
public class MySpringBootApplication extends SpringBootServletInitializer {

我的Spring-Boot RestController类（自动装配MyService类的实例）

@RestController
public class MyController {

    @Autowired
    MyService myService;
我的服务接口（我没有提供任何@Service注释）
public interface MyService {
    //all service method definitions
}
使用自动装配repository实例的Spring ServiceImpl类来操作PostgreSQL数据库。
@Service("myService")
public class MyServiceImpl implements MyService {

       @Autowired
       private MyRepository myRepository; <-- **ERROR -- Bean not found** 

       //other default services e.g. find, add, delete, update, etc.

}
我的Repository类
@Repository
public interface MyRepository extends JpaRepository<MyRequestBody, Long> {
    @Query("select h from MyRequestBody h where h.column1 = ?1")
    List<MyRequestBody> findByColumn1(String col1);
}
我的实体类。
@Entity
@Table(name = "myTable", schema = "my_db")
public class MyRequestBody { <-- **ERROR -- Not a managed class type**

     @Id
     @Column(name = "id")
     @GeneratedValue(strategy = GenerationType.SEQUENCE)
     private Long id;
     @Column(name = "column1")
     private String column1;

//getter and setter AND toString methods

错误日志（在Tomcat部署.WAR文件时）

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-12-28 15:50:23.282 ERROR 5320 --- [ost-startStop-1] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'MyController': Unsatisfied dependency expressed through field 'myService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myService': Unsatisfied dependency expressed through field 'myRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class com.rest.MyRequestBody
在添加了 @EntityScan("entities_package_name") 后。
***************************
APPLICATION FAILED TO START
***************************

Description:

Field myRepository in com.rest.MyServiceImpl required a bean of type 'com.rest.MyRepository' that could not be found.


Action:

Consider defining a bean of type 'com.rest.MyRepository' in your configuration.

29-Dec-2017 08:22:25.023 SEVERE [localhost-startStop-1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
 org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/spring-boot-service]]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:986)
        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myController': Unsatisfied dependency expressed through field 'myService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myService': Unsatisfied dependency expressed through field 'myRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.rest.MyRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588)
        at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
        at org.springframework.boot.web.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:154)
        at org.springframework.boot.web.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:134)
        at org.springframework.boot.web.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:87)
        at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:169)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5196)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        ... 10 more
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myService': Unsatisfied dependency expressed through field 'myRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.rest.MyRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588)
        at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
        at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
        ... 32 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.rest.MyRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1493)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
        ... 45 more

29-Dec-2017 08:22:25.026 SEVERE [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Error deploying web application archive [/home/sunilg/apache-tomcat-8.5.24/webapps/spring-boot-service.war]
 java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/spring-boot-service]]
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:756)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:986)
        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
你使用了哪个@Entity注解？ - Gopal
javax.persistence.Entity - somnathchakrabarti
7个回答
46

Spring不知道你的实体类。你需要使用@EntityScan("your.entities.package")注释来指定MySpringBootApplication类所在的包。

在将@EntityScan添加到MySpringBootApplication类后，出现了新的错误。我已经编辑了我的问题并附上了新的错误日志。 - somnathchakrabarti
2
我需要在MySpringBootApplication类中添加@EnableJpaRepositories("package_for_repository")吗？ - somnathchakrabarti
3
是的，在添加了@EnableJpaRepositories之后，它运作正常了！ - somnathchakrabarti
EntityScan是我学到的一个新注释，它对我很有用。我只是想知道为什么Spring没有提到它。我曾经认为即使实体类也将被scanBasePackage扫描。无论如何，谢谢！ - old_soul_on_the_run
4
在我的情况下，实体类缺少@Entity和@Id注释。
1
我有一个类似的错误，但是我在应用程序上添加了EnableJpaRepositories和EntityScan注释，并指定了确切的包。该实体具有实体和ID注释，尽管如此它仍然不起作用。 - Woodsman
1

你应该将实体类与仓库类放在同一个模块中， 如果没有，你需要在应用程序类中添加 @EntityScan 注解。

1
我们需要使用setPackagesToScan()方法将我们的实体类包配置到LocalContainerEntityManagerFactoryBean中。 考虑以下示例：
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource, JpaVendorAdapter jpaVendorAdapter) {
    LocalContainerEntityManagerFactoryBean bean = new LocalContainerEntityManagerFactoryBean();
    bean.setDataSource(dataSource);
    bean.setJpaVendorAdapter(jpaVendorAdapter);
    bean.setPackagesToScan("your entity packaged name here");
    return bean;
}
1

示例错误 "UnsatisfiedDependencyException: 创建名称为'appModelController'的bean时出错：通过字段'jpaModelRepository'表达的不满足依赖项""

ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'appModelController': Unsatisfied dependency expressed through field 'jpaModelRepository': Error creating bean with name 'jpaModelRepository' defined in com.spring.jpaRestApi.repository.JpaModelRepository defined in @EnableJpaRepositories declared on JpaRestApiApplication: Not a managed type: class com.spring.jpaRestApi.model.JpaModel

环境：Java 17项目结构，Spring 3.0.1 这个项目使用Jakarta的注解（例如：jakarta.persistence.Entity）而不是javax.persistence。使用Jakarta注解后，我的项目开始正常工作。

https://dev59.com/m-k5XIcBkEYKwwoY9-lg#74841081

0

我曾经遇到过类似的问题，但我不确定你的代码是否相同，但我为其他遇到此错误的人编写了这个答案。我犯了一个错误，即给出了错误的包名称，而不是组合的工件ID和组ID（小笔误），当我纠正它时，问题得到了解决。

0
<code>
//if use builder you have to add package to scan 
@Primary
@Bean(name = "entityManagerFactory")
public LocalContainerEntityManagerFactoryBean entityManagerFactory(
EntityManagerFactoryBuilder builder
){
return builder
  .dataSource(dataSource())
  .packages("root path of package")
  .persistenceUnit("productenter code here")
  .build();

 }
</code>
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