我是新手使用弹簧靴。 我正在尝试使用apache derby作为嵌入式数据库创建REST API，但是我收到此错误：
＆＃34;使用名称＆＃39; entityManagerFactory＆＃39;＆＃34;创建bean时出错。
pom.xml：
http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0
<groupId>com.restapi</groupId>
<artifactId>restApi</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>restApi</name>
<description>Demo project for Rest API with spring boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
控制器：
@RequestMapping(value="/topics")
public List<Topic> getTopics(){
return topicService.getAllTopics();
}
@RequestMapping(value="/topics",method=RequestMethod.POST)
public void addTopic(@RequestBody Topic topic){
topicService.addTopic(topic);
}
}
商业服务：
public List<Topic> getAllTopics(){
List<Topic> topics = new ArrayList();
topicRepository.findAll().forEach(topics::add);
return topics;
}
public void addTopic(Topic topic){
topicRepository.save(topic);
}
实体类存储库：
public interface TopicRepository extends CrudRepository<Topic, Long>{
}
实体类：
@Entity
public class Topic {
@Id
@GeneratedValue
private Long id;
private String name;
private String description;
public Topic(){
}
public Topic(Long id, String name, String description) {
super();
this.id = id;
this.name = name;
this.description = description;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
应用：
@SpringBootApplication
public class RestApiApplication {
public static void main(String[] args) {
SpringApplication.run(RestApiApplication.class, args);
}
}
错误：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.2.RELEASE)
2017-04-05 20:11:15.788 INFO 8756 --- [ main] com.restapi.RestApiApplicationTests : Starting RestApiApplicationTests on DESKTOP-8C6TQN1 with PID 8756 (started by mahid in C:\Users\mahid\Documents\NetBeansProjects\restApi)
2017-04-05 20:11:15.788 INFO 8756 --- [ main] com.restapi.RestApiApplicationTests : No active profile set, falling back to default profiles: default
2017-04-05 20:11:15.865 INFO 8756 --- [ main] o.s.w.c.s.GenericWebApplicationContext : Refreshing org.springframework.web.context.support.GenericWebApplicationContext@702b8b12: startup date [Wed Apr 05 20:11:15 CDT 2017]; root of context hierarchy
2017-04-05 20:11:17.915 INFO 8756 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$c3650505] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2017-04-05 20:11:19.282 INFO 8756 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2017-04-05 20:11:19.315 INFO 8756 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2017-04-05 20:11:19.432 INFO 8756 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.0.12.Final}
2017-04-05 20:11:19.435 INFO 8756 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2017-04-05 20:11:19.439 INFO 8756 --- [ main] org.hibernate.cfg.Environment : HHH000021: Bytecode provider name : javassist
2017-04-05 20:11:19.506 INFO 8756 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2017-04-05 20:11:19.777 INFO 8756 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.DerbyDialect
2017-04-05 20:11:19.784 WARN 8756 --- [ main] org.hibernate.dialect.DerbyDialect : HHH000430: The DerbyDialect dialect has been deprecated; use one of the version-specific dialects instead
2017-04-05 20:11:20.476 WARN 8756 --- [ main] o.s.w.c.s.GenericWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
2017-04-05 20:11:20.491 INFO 8756 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-04-05 20:11:20.491 ERROR 8756 --- [ main] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1081) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:856) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at
org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) ~[spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
at
org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) ~[spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
我没有在application.properties中定义任何内容。
答案 0 :(得分：1)
该异常清楚地表明您正在混合使用hibernate和JPA库。由于跨库导入和尝试运行应用程序给你的例外。您正在尝试根据异常创建Hibernate SessionFactory，并且您可能正在为其他人导入所有JPA库。 确保您正在导入所有JPA库或所有hibernate库。 不应该交叉导入库。 请仔细检查您的代码。
“org.springframework.beans.factory.BeanCreationException：在类路径资源中定义名为'entityManagerFactory'的bean时出错[org / springframework / boot / autoconfigure / orm / jpa / HibernateJpaAutoConfiguration.class]：调用init方法失败;嵌套异常是javax.persistence.PersistenceException：[PersistenceUnit：default]无法在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean（AbstractAutowireCapableBeanFactory.java:1628）〜[spring-beans-4.3.7]构建Hibernate SessionFactory .RELEASE.jar：4.3.7.RELEASE]“
答案 1 :(得分：0)
步骤1 - ＆gt;使用父工件的更新版本。
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.6.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
步骤2 - ＆gt;更新您的Maven项目（ALT + F5）
答案 2 :(得分：0)
在您参考教程视频时，我相信您在业务服务类中将构造型注释用作@Service。 请配置“ application.properties”，spring boot需要它来配置数据源和其他基础功能。 我已经配置如下。请根据您的要求更改配置。我也在使用嵌入式derby数据库，并且出现了同样的异常。我通过在application.properties文件中添加配置来解决。
#PROFILES
spring.profiles.active=dev
#JPA (JpaBaseConfiguration, HibernateJpaAutoConfiguration)
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=update
spring.jpa.database=default
spring.jpa.show-sql=true
#DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
spring.datasource.continue-on-error=false
spring.datasource.generate-unique-name=false