"java.lang.IllegalArgumentException: Kein verwalteter Typ ...", wenn die Entitätsklasse und das Spring-Datenrepository im gleichen Paket sind

Question

Ich habe ein ziemlich merkwürdiges Verhalten in meiner einfachen Spring-Anwendung. Ich bin nicht in der Lage, eine JPA-Entität und ein Spring Data Repository im selben Paket zu haben.

Ich möchte eine sehr einfache Webanwendung erstellen, in der ich einige Benutzer verwalte. Also begann ich von Grund auf neu und erstellt die folgende Projektstruktur:

src 
| 
+-- main 
    | 
    +-- de.my.mainpackage 
     |  
     +-- client 
     | | 
     | +-- ClientApp.java 
     | 
     +-- core 
     | 
     +-- user 
      | 
      +-- User.java 
      | 
      +-- UserRepository.java 

Code of User.java:

package de.my.mainpackage.core.user; 

import lombok.AllArgsConstructor; 
import lombok.Data; 
import lombok.NoArgsConstructor; 

import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.Id; 

@Entity 
@Data 
@NoArgsConstructor 
@AllArgsConstructor 
public class User { 
    @Id 
    @GeneratedValue 
    private Long id; 

    private String username; 
    private String password; 
    private String email; 
} 

Code of UserRepository.java:

package de.my.mainpackage.core.user; 

import org.springframework.data.jpa.repository.JpaRepository; 
import org.springframework.stereotype.Repository; 

@Repository 
public interface UserRepository extends JpaRepository<User, Long>{ 
} 

Code of ClientApp.java :

package de.my.mainpackage.client; 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 
import de.my.mainpackage.core.user.UserRepository; 
import org.springframework.context.ApplicationContext; 
import org.springframework.data.jpa.repository.config.EnableJpaRepositories; 


@SpringBootApplication 
@EnableJpaRepositories("de.my.mainpackage.core.user") 
public class ClientApp { 

    @Autowired 
    private UserRepository userRepository; 

    public static void main(String[] args) { 
     ApplicationContext applicationContext = SpringApplication.run(ClientApp.class, args); 
     ClientApp clientApp = (ClientApp)applicationContext.getBean("clientApp"); 

     System.out.println("userRepository is = " + clientApp.userRepository); 
    } 
} 

Meine Idee war also, das Modell und das Repository in ein eigenes Verzeichnis core.user zu unterteilen, während die Hauptanwendungslogik im Unterordner client bleiben sollte. Aber wenn ich meinen Frühling Anwendung mit dieser Konfiguration laufen lasse, erhalte ich folgende Fehlermeldung:

"C:\Program Files\Java\jdk1.8.0_152\bin\java" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=61131 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2017.2.4\lib\idea_rt.jar=61132:C:\Program Files\JetBrains\IntelliJ IDEA 2017.2.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_152\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_152\jre\lib\rt.jar;C:\Users\Artur\IdeaProjects\repositoryissue\target\classes;C:\Users\Artur\.m2\repository\org\springframework\boot\spring-boot-starter-data-jpa\1.5.9.RELEASE\spring-boot-starter-data-jpa-1.5.9.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\boot\spring-boot-starter\1.5.9.RELEASE\spring-boot-starter-1.5.9.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\boot\spring-boot\1.5.9.RELEASE\spring-boot-1.5.9.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\1.5.9.RELEASE\spring-boot-autoconfigure-1.5.9.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\boot\spring-boot-starter-logging\1.5.9.RELEASE\spring-boot-starter-logging-1.5.9.RELEASE.jar;C:\Users\Artur\.m2\repository\ch\qos\logback\logback-classic\1.1.11\logback-classic-1.1.11.jar;C:\Users\Artur\.m2\repository\ch\qos\logback\logback-core\1.1.11\logback-core-1.1.11.jar;C:\Users\Artur\.m2\repository\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;C:\Users\Artur\.m2\repository\org\slf4j\log4j-over-slf4j\1.7.25\log4j-over-slf4j-1.7.25.jar;C:\Users\Artur\.m2\repository\org\springframework\spring-core\4.3.13.RELEASE\spring-core-4.3.13.RELEASE.jar;C:\Users\Artur\.m2\repository\org\yaml\snakeyaml\1.17\snakeyaml-1.17.jar;C:\Users\Artur\.m2\repository\org\springframework\boot\spring-boot-starter-aop\1.5.9.RELEASE\spring-boot-starter-aop-1.5.9.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\spring-aop\4.3.13.RELEASE\spring-aop-4.3.13.RELEASE.jar;C:\Users\Artur\.m2\repository\org\aspectj\aspectjweaver\1.8.13\aspectjweaver-1.8.13.jar;C:\Users\Artur\.m2\repository\org\springframework\boot\spring-boot-starter-jdbc\1.5.9.RELEASE\spring-boot-starter-jdbc-1.5.9.RELEASE.jar;C:\Users\Artur\.m2\repository\org\apache\tomcat\tomcat-jdbc\8.5.23\tomcat-jdbc-8.5.23.jar;C:\Users\Artur\.m2\repository\org\apache\tomcat\tomcat-juli\8.5.23\tomcat-juli-8.5.23.jar;C:\Users\Artur\.m2\repository\org\springframework\spring-jdbc\4.3.13.RELEASE\spring-jdbc-4.3.13.RELEASE.jar;C:\Users\Artur\.m2\repository\org\hibernate\hibernate-core\5.0.12.Final\hibernate-core-5.0.12.Final.jar;C:\Users\Artur\.m2\repository\org\jboss\logging\jboss-logging\3.3.1.Final\jboss-logging-3.3.1.Final.jar;C:\Users\Artur\.m2\repository\org\hibernate\javax\persistence\hibernate-jpa-2.1-api\1.0.0.Final\hibernate-jpa-2.1-api-1.0.0.Final.jar;C:\Users\Artur\.m2\repository\org\javassist\javassist\3.21.0-GA\javassist-3.21.0-GA.jar;C:\Users\Artur\.m2\repository\antlr\antlr\2.7.7\antlr-2.7.7.jar;C:\Users\Artur\.m2\repository\org\jboss\jandex\2.0.0.Final\jandex-2.0.0.Final.jar;C:\Users\Artur\.m2\repository\dom4j\dom4j\1.6.1\dom4j-1.6.1.jar;C:\Users\Artur\.m2\repository\org\hibernate\common\hibernate-commons-annotations\5.0.1.Final\hibernate-commons-annotations-5.0.1.Final.jar;C:\Users\Artur\.m2\repository\org\hibernate\hibernate-entitymanager\5.0.12.Final\hibernate-entitymanager-5.0.12.Final.jar;C:\Users\Artur\.m2\repository\javax\transaction\javax.transaction-api\1.2\javax.transaction-api-1.2.jar;C:\Users\Artur\.m2\repository\org\springframework\data\spring-data-jpa\1.11.9.RELEASE\spring-data-jpa-1.11.9.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\data\spring-data-commons\1.13.9.RELEASE\spring-data-commons-1.13.9.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\spring-orm\4.3.13.RELEASE\spring-orm-4.3.13.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\spring-context\4.3.13.RELEASE\spring-context-4.3.13.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\spring-expression\4.3.13.RELEASE\spring-expression-4.3.13.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\spring-tx\4.3.13.RELEASE\spring-tx-4.3.13.RELEASE.jar;C:\Users\Artur\.m2\repository\org\springframework\spring-beans\4.3.13.RELEASE\spring-beans-4.3.13.RELEASE.jar;C:\Users\Artur\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\Artur\.m2\repository\org\slf4j\jcl-over-slf4j\1.7.25\jcl-over-slf4j-1.7.25.jar;C:\Users\Artur\.m2\repository\org\springframework\spring-aspects\4.3.13.RELEASE\spring-aspects-4.3.13.RELEASE.jar;C:\Users\Artur\.m2\repository\org\projectlombok\lombok\1.16.18\lombok-1.16.18.jar;C:\Users\Artur\.m2\repository\mysql\mysql-connector-java\5.1.44\mysql-connector-java-5.1.44.jar" de.my.mainpackage.client.ClientApp 

    . ____   _   __ _ _ 
/\\/___'_ __ _ _(_)_ __ __ _ \ \ \ \ 
(()\___ | '_ | '_| | '_ \/ _` | \ \ \ \ 
\\/ ___)| |_)| | | | | || (_| | )))) 
    ' |____| .__|_| |_|_| |_\__, |//// 
=========|_|==============|___/=/_/_/_/ 
:: Spring Boot ::  (v1.5.9.RELEASE) 

2017-12-30 19:56:07.068 INFO 11140 --- [   main] de.my.mainpackage.client.ClientApp  : Starting ClientApp on WinBook with PID 11140 (C:\Users\Artur\IdeaProjects\repositoryissue\target\classes started by Artur in C:\Users\Artur\IdeaProjects\repositoryissue) 
2017-12-30 19:56:07.068 INFO 11140 --- [   main] de.my.mainpackage.client.ClientApp  : No active profile set, falling back to default profiles: default 
2017-12-30 19:56:07.177 INFO 11140 --- [   main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@b7f23d9: startup date [Sat Dec 30 19:56:07 CET 2017]; root of context hierarchy 
2017-12-30 19:56:08.332 INFO 11140 --- [   main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default' 
2017-12-30 19:56:08.348 INFO 11140 --- [   main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [ 
    name: default 
    ...] 
2017-12-30 19:56:08.457 INFO 11140 --- [   main] org.hibernate.Version     : HHH000412: Hibernate Core {5.0.12.Final} 
2017-12-30 19:56:08.457 INFO 11140 --- [   main] org.hibernate.cfg.Environment   : HHH000206: hibernate.properties not found 
2017-12-30 19:56:08.457 INFO 11140 --- [   main] org.hibernate.cfg.Environment   : HHH000021: Bytecode provider name : javassist 
2017-12-30 19:56:08.488 INFO 11140 --- [   main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final} 
2017-12-30 19:56:08.551 INFO 11140 --- [   main] org.hibernate.dialect.Dialect   : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect 
2017-12-30 19:56:08.660 INFO 11140 --- [   main] org.hibernate.tool.hbm2ddl.SchemaUpdate : HHH000228: Running hbm2ddl schema update 
2017-12-30 19:56:08.676 INFO 11140 --- [   main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default' 
2017-12-30 19:56:08.770 WARN 11140 --- [   main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'clientApp': Unsatisfied dependency expressed through field 'userRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class de.my.mainpackage.core.user.User 
2017-12-30 19:56:08.770 INFO 11140 --- [   main] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default' 
2017-12-30 19:56:08.785 INFO 11140 --- [   main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled. 
2017-12-30 19:56:08.809 ERROR 11140 --- [   main] o.s.boot.SpringApplication    : Application startup failed 

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'clientApp': Unsatisfied dependency expressed through field 'userRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class de.my.mainpackage.core.user.User 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE] 
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE] 
    at de.my.mainpackage.client.ClientApp.main(ClientApp.java:19) [classes/:na] 
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class de.my.mainpackage.core.user.User 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    ... 18 common frames omitted 
Caused by: java.lang.IllegalArgumentException: Not a managed type: class de.my.mainpackage.core.user.User 
    at org.hibernate.jpa.internal.metamodel.MetamodelImpl.managedType(MetamodelImpl.java:210) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final] 
    at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:70) ~[spring-data-jpa-1.11.9.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getEntityInformation(JpaEntityInformationSupport.java:68) ~[spring-data-jpa-1.11.9.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:173) ~[spring-data-jpa-1.11.9.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:106) ~[spring-data-jpa-1.11.9.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:88) ~[spring-data-jpa-1.11.9.RELEASE.jar:na] 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:200) ~[spring-data-commons-1.13.9.RELEASE.jar:na] 
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:277) ~[spring-data-commons-1.13.9.RELEASE.jar:na] 
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:263) ~[spring-data-commons-1.13.9.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:101) ~[spring-data-jpa-1.11.9.RELEASE.jar:na] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] 
    ... 28 common frames omitted 


Process finished with exit code 1 

Um die UserRepository zur Verfügung ClientApp zu machen habe ich die @EnableJpaRepositories("de.my.mainpackage.core.user"). Nun das komische Ding:

Wenn ich die User.java bis zum Client-Unterpaket verschiebe, funktioniert es gut. So:

src 
    | 
    +-- main 
     | 
     +-- de.my.mainpackage 
      |  
      +-- client 
      | | 
      | +-- ClientApp.java 
      | | 
      | +-- User.java 
      | 
      +-- core 
      | 
      +-- user 
       |    
       | 
       +-- UserRepository.java 

Ausgang:

... 
2017-12-30 20:05:56.032 INFO 12704 --- [   main] de.my.mainpackage.client.ClientApp  : Started ClientApp in 2.799 seconds (JVM running for 3.815) 
userRepository is = org.springframework.data.jpa.repository.support.SimpleJpaRepository@736048ed 
2017-12-30 20:05:56.048 INFO 12704 --- [  Thread-9] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@b7f23d9: startup date [Sat Dec 30 20:05:53 CET 2017]; root of context hierarchy 
2017-12-30 20:05:56.048 INFO 12704 --- [  Thread-9] o.s.j.e.a.AnnotationMBeanExporter  : Unregistering JMX-exposed beans on shutdown 
2017-12-30 20:05:56.048 INFO 12704 --- [  Thread-9] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default' 

    Process finished with exit code 0 

So verbrachte ich viel Zeit und versucht, herauszufinden, was ich falsch mache ... keine Ahnung.

Answer 1

Dank @JB Nizet:

Ich dachte, dass @EnableJpaRepositories und @ComponentScan mit den richtigen Pakete durch Setzen, dass genug sein würde. Ich wusste nicht, dass für Entitäten auch @EntityScan benötigt wird. Vielen Dank für diesen Hinweis!