字段存储库需要一个名为“entityManagerFactory”的 bean,但无法找到
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【中文标题】字段存储库需要一个名为“entityManagerFactory”的 bean,但无法找到【英文标题】:Field repository required a bean named 'entityManagerFactory' that could not be found 【发布时间】:2019-02-23 10:02:13 【问题描述】:我花了几天时间试图解决这个错误,但没有成功。我正在尝试配置两个数据库并写入它们。
我看了:
https://medium.com/@joeclever/using-multiple-datasources-with-spring-boot-and-spring-data-6430b00c02e7
https://www.baeldung.com/spring-data-jpa-multiple-databases
https://www.devglan.com/spring-boot/spring-boot-multiple-database-configuration
https://raymondhlee.wordpress.com/2015/10/31/configuring-multiple-jpa-entity-managers-in-spring-boot/
https://github.com/igormukhin/spring-boot-sample-data-jpa-multiple/blob/master/src/main/java/sample/data/jpa/Database1Configuration.java 并从 SO 中获取更多链接以获取错误或类似示例。
这是我的代码:
fromDB.datasource.url=jdbc:h2:file:D:/test1/db1
fromDB.datasource.username=sa
fromDB.datasource.password=
fromDB.datasource.platform=h2
fromDB.datasource.driverClassName=org.h2.Driver
toDB.datasource.url=jdbc:h2:file:D:/test2/db2
toDB.datasource.username=sa
toDB.datasource.password=
toDB.datasource.platform=h2
toDB.datasource.driverClassName=org.h2.Driver
spring.h2.console.enabled=true
spring.h2.console.path=/h2-console
spring.h2.console.settings.trace=true
spring.h2.console.settings.web-allow-others=true
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
休眠设置-hibernate.properties
spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.properties.hibernate.show_sql=true
spring.jpa.properties.hibernate.use_sql_comments=false
spring.jpa.properties.hibernate.format_sql=true
spring.datasource.initialization-mode=always
spring.datasource.initialize=true
spring.jpa.generate-ddl=true
配置类
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "toEntityManager",
transactionManagerRef = "toTransactionManager",
basePackages = "leadTime.service"
)
public class ToDBConfig
@Bean
@ConfigurationProperties(prefix = "toDB.datasource")
public DataSource toDataSource()
return DataSourceBuilder
.create()
.build();
@Bean(name = "toEntityManager")
public LocalContainerEntityManagerFactoryBean toEntityManagerFactory(
EntityManagerFactoryBuilder builder)
return builder
.dataSource(toDataSource())
.properties(hibernateProperties())
.packages(TestDataTo.class)
.persistenceUnit("to")
.build();
@Bean(name = "toTransactionManager")
public PlatformTransactionManager toTransactionManager(@Qualifier("toEntityManager") EntityManagerFactory entityManagerFactory)
return new JpaTransactionManager(entityManagerFactory);
private Map hibernateProperties()
Resource resource = new ClassPathResource("hibernate.properties");
try
Properties properties = PropertiesLoaderUtils.loadProperties(resource);
return properties.entrySet().stream()
.collect(Collectors.toMap(
e -> e.getKey().toString(),
e -> e.getValue())
);
catch (IOException e)
return new HashMap();
第二个配置类
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "fromEntityManager",
transactionManagerRef = "fromTransactionManager",
basePackages = "leadTime.service"
)
public class FromDBConfig
@Primary
@Bean
@ConfigurationProperties(prefix = "fromDB.datasource")
public DataSource fromDataSource()
return DataSourceBuilder
.create()
.build();
@Primary
@Bean(name = "fromEntityManager")
public LocalContainerEntityManagerFactoryBean fromEntityManagerFactory(
EntityManagerFactoryBuilder builder)
return builder
.dataSource(fromDataSource())
.properties(hibernateProperties())
.packages(TestDataFrom.class)
.persistenceUnit("from")
.build();
@Primary
@Bean(name = "fromTransactionManager")
public PlatformTransactionManager fromTransactionManager(@Qualifier("fromEntityManager") EntityManagerFactory entityManagerFactory)
return new JpaTransactionManager(entityManagerFactory);
private Map hibernateProperties()
Resource resource = new ClassPathResource("hibernate.properties");
try
Properties properties = PropertiesLoaderUtils.loadProperties(resource);
return properties.entrySet().stream()
.collect(Collectors.toMap(
e -> e.getKey().toString(),
e -> e.getValue())
);
catch (IOException e)
return new HashMap();
存储库:
public interface ToRepository extends CrudRepository<TestDataTo, Integer>
@Override
TestDataTo save(TestDataTo testDataTo);
数据初始化:
@Component
public class DataInit
@Autowired
ToRepository toRepository;
@Autowired
FromRepository fromRepository;
@Transactional("fromTransactionManager")
public void insertDataIntoFromDB() throws SQLException
TestDataFrom testDataFrom = new TestDataFrom();
testDataFrom.setId(1);
testDataFrom.setName("Test");
fromRepository.save(testDataFrom);
//
@Transactional("toTransactionManager")
public void insertDataIntoToDB() throws SQLException
TestDataTo testDataTo = new TestDataTo();
testDataTo.setId(1);
testDataTo.setName("Ale");
toRepository.save(testDataTo);
主类:
@EnableTransactionManagement
@SpringBootApplication
public class LeadTimeApplication
private Logger LOG = LoggerFactory.getLogger("LeadTimeApplication");
@Autowired
ToRepository toRepository;
@Autowired
FromRepository fromRepository;
public static void main(String[] args)
SpringApplication.run(LeadTimeApplication.class, args);
@Autowired DataInit initializer;
@PostConstruct
public void init() throws SQLException
initializer.insertDataIntoFromDB();
initializer.insertDataIntoToDB();
错误:
***************************
APPLICATION FAILED TO START
***************************
Description:
Field toRepository in leadTime.LeadTimeApplication
required a bean named 'entityManagerFactory' that could not be found.
Action:
Consider defining a bean named 'entityManagerFactory' in your configuration.
我试过了: 使用
@EnableAutoConfiguration(exclude = JpaRepositoriesAutoConfiguration.class, DataSourceTransactionManagerAutoConfiguration.class)
老实说,我不知道还能做什么,我用不同的方法多次重写了这段代码,但都没有成功。如果我让他开始工作,不配置新的 entityManagers 和事务并且不使用@Transactional
,应用程序正在工作(创建了 2 个 DB),但两个表都是在同一个 DB 中创建的(当然)
添加 gradle 配置
//Spring dependencies
compile "org.springframework.boot:spring-boot-starter-
actuator:$springBootVersion"
compile "org.springframework.boot:spring-boot-starter-
web:$springBootVersion"
compile "org.springframework.boot:spring-boot-starter-
logging:$springBootVersion"
compile "org.springframework.boot:spring-boot-configuration-
processor:$springBootVersion"
//JPA dependency
compile "org.springframework.boot:spring-boot-starter-data-
jpa:$springBootVersion"
testCompile "com.oracle:ojdbc7:12.1.0.2"
testCompile 'com.h2database:h2:1.4.194'
runtime 'com.h2database:h2:1.4.194'
// compile group: 'h2', name: 'h2', version: '0.2.0'
compile group: 'org.hibernate', name: 'hibernate-entitymanager'
//compile group: 'org.hibernate', name: 'hibernate-gradle-plugin', version:
'5.3.6.Final'
// https://mvnrepository.com/artifact/org.hibernate/hibernate-core
compile group: 'org.hibernate', name: 'hibernate-core'
【问题讨论】:
很明显你错过了EntityManagerFactory
bean 定义。
但是我有两个,每个数据库一个:这应该是其中之一:@Bean(name = "toEntityManager") public LocalContainerEntityManagerFactoryBean toEntityManagerFactory
在example 中,他们使用“entityManagerFactory”作为bean 名称。你可以试试它而不是“toEntityManager”吗?
之前和现在都尝试过:错误-> 不是托管类型:class LeadTime.to.TestDataTo。这几天我试图通过添加EntityScan等来解决它(移动到另一个包中)..但没有成功。
【参考方案1】:
根据你粘贴的内容
https://medium.com/@joeclever/using-multiple-datasources-with-spring-boot-and-spring-data-6430b00c02e7
其中一个 darasource 被配置为“默认”,另一个被命名。您正在创建两个带有 from
和 to
前缀的“命名”bean。
更改例如from
数据库定义entityManager
而不是fromEntityManager
,应该没问题。
我不知道内部原理,但就常识而言,您尝试的应该可行,实际上应用程序配置器需要一些默认数据源,因此会出现错误。
【讨论】:
正如@Boris 建议的那样,我尝试使用“entityManagerFactory”。 IDE 告诉我这是一个默认参数,如果我使用它,我会收到以下错误:不是托管类型:class LeadTime.to.TestDataTo。这几天我试图通过添加EntityScan等来解决它..但没有成功 现在我尝试使用“entityManager”(仅)但我遇到了与以前相同的错误:需要一个名为“entityManagerFactory”的bean,但无法找到。 @Agata - 你的问题解决了吗?我也一样:( @Matley,检查此链接并将类放在不同的包中(这是我的 porb):github.com/spring-projects/spring-data-examples/tree/master/jpa/…以上是关于字段存储库需要一个名为“entityManagerFactory”的 bean,但无法找到的主要内容,如果未能解决你的问题,请参考以下文章
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