Spring 引导说没有可用的名为 'entityManagerFactory' 的 bean

Question

我正在开发一个新应用程序（对我来说），我在启动时收到了没有 bean 'entityManagerFactory' 可用错误。遇到过这种情况的其他人表示，如果我正确定义了数据源，这种情况就不会发生。让我感到困惑的是 Spring Boot/JPA 或 Flyway（我也在使用）坚持要为你的 one 使用特定的属性名称数据源。如果你有多个，我不确定有人会如何处理它。我需要更改我们的 application.properties 文件以从环境变量中获取，以便它们可以从秘密中获取值。我有一个定义，以便 flyway 可以进行可能的迁移。我还有另一个，这样 Spring-Boot 就可以完成基于 JPA 的工作。我有另一个，因为现有代码之前定义了一个数据源并相应地连接。所有人都去同一个数据库。我希望我只能使用一组 application.properties 属性，但更重要的是，我希望解决此 entityManagerFactory 错误。因为我的修复感觉很麻烦，所以我想伸出手看看我不理解的地方。

这是application.properties

spring.profiles.active=sprint-vault-services-not-available
spring.application.name=file-generator
file.generator.schema=FILE_GENERATOR

spring.flyway.enabled=true
spring.flyway.locations=classpath:db/migration
spring.flyway.schemas=${file.generator.schema}
spring.flyway.baseline-on-migrate=false

file-generator.date-format=MMddyy
file-generator.time-format=HHmmss
file-generator.ebcdic-output-path=app/output/ebcdic
file-generator.csv-output-path=app/output/csv
file-generator.header-timestamp-format=yyyyMMddHHmmss
file-generator.file-sequence-number=1

logging.path=app/logs

bcupload_datasource_url=${BCUPLOAD_DATASOURCE_URL}
#spring.jpa.properties.hibernate.default_schema=FILE_GENERATOR
bcupload_datasource_username=${BCUPLOAD_DATASOURCE_USERNAME}
bcupload_datasource_password=${BCUPLOAD_DATASOURCE_PASSWORD}
bcupload_datasource_driver=${BCUPLOAD_DATASOURCE_DRIVER}
bcupload_datasource_flyway_db_name=LocalFileGenerator

spring.datasource.driver-class-name=${BCUPLOAD_DATASOURCE_DRIVER}
spring.datasource.url=${BCUPLOAD_DATASOURCE_URL}
spring.datasource.password=${BCUPLOAD_DATASOURCE_PASSWORD}
spring.datasource.username=${BCUPLOAD_DATASOURCE_USERNAME}
spring.jpa.database-platform=DB2Platform
spring.jpa.show-sql=true
spring.jpa.generate-ddl=false
spring.jpa.hibernate.ddl-auto=none


spring.flyway.url= ${BCUPLOAD_DATASOURCE_URL}
spring.flyway.user=${BCUPLOAD_DATASOURCE_USERNAME}
spring.flyway.password=${BCUPLOAD_DATASOURCE_PASSWORD}


spring.jpa.properties.hibernate.jdbc.time_zone=UTC

2021-04-12 23:06:34 DEBUG o.s.b.d.LoggingFailureAnalysisReporter - Application failed to start due to an exception
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'entityManagerFactory' available
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:814)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1282)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:297)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:330)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:113)
    at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:691)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:508)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:374)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:134)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1699)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1444)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=13=](AbstractBeanFactory.java:323)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:623)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:611)
    at org.springframework.data.repository.config.DeferredRepositoryInitializationListener.onApplicationEvent(DeferredRepositoryInitializationListener.java:51)
    at org.springframework.data.repository.config.DeferredRepositoryInitializationListener.onApplicationEvent(DeferredRepositoryInitializationListener.java:36)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:403)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:360)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:897)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
    at com.mycompany.cloud.cost.ssc.file.generator.FileGeneratorApplication.main(FileGeneratorApplication.java:22)

数据源的 Bean 定义：

package com.ibm.cio.cloud.cost.ssc.file.generator.configuration;

import java.util.HashMap;
import java.util.Map;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;

@Configuration
public class DataSourceConfig {
    private String dataSourceUrl;
    private String userName;
    private String password;
    private String driver;
    
    /*
    @Bean
    public EntityManagerFactoryBuilder builder(Environment environment) {
        Map<String, String> jpaProperties = new HashMap<>();
        jpaProperties.put("hibernate.show_sql", environment.getProperty("spring.jpa.show-sql"));
        jpaProperties.put("hibernate.format_sql", environment.getProperty("spring.jpa.properties.hibernate.format_sql"));
        jpaProperties.put("hibernate.dialect", environment.getProperty("spring.jpa.properties.hibernate.dialect"));
        return new EntityManagerFactoryBuilder(new HibernateJpaVendorAdapter(), jpaProperties, null);
    }
    */

    @Autowired
    public DataSourceConfig(@Value("${bcupload_datasource_url}") String bcupload_datasource_url,
            @Value("${bcupload_datasource_username}") String bcupload_datasource_username,
            @Value("${bcupload_datasource_password}") String bcupload_datasource_password,
            @Value("${bcupload_datasource_driver}") String bcupload_datasource_driver) {
        this.dataSourceUrl = bcupload_datasource_url;
        this.userName = bcupload_datasource_username;
        this.password = bcupload_datasource_password;
        this.driver = bcupload_datasource_driver;
    }

    @Bean(name = "bcUploadDataSource")
    public DataSource dataSource() {
        return DataSourceBuilder.create()
                .url(dataSourceUrl)
                .username(userName)
                .password(password)
                .driverClassName(driver).build();

    }

}

Answer 1

我有一个包含多个数据源的项目，每个数据源最终看起来像这样：


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy;
import org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.env.Environment;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;

import javax.sql.DataSource;
import java.util.HashMap;

@Configuration
@EnableJpaRepositories(
        basePackages = {"com.your.repositories.packages"},
        entityManagerFactoryRef = "entityManagerFactory",
        transactionManagerRef = "transactionManager")
public class DataSourceConfig{


    @Bean(name = "entityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManager() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource());
        em.setPackagesToScan(new String[] { "com.entity.pacakges"});
        em.setPersistenceUnitName("your_name");
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter(vendorAdapter);
        HashMap<String, Object> properties = new HashMap<>();
        properties.put("hibernate.hbm2ddl.auto", env.getProperty("spring.jpa.hibernate.ddl-auto"));
        properties.put("hibernate.dialect", env.getProperty("spring.jpa.properties.hibernate.dialect"));
        properties.put("hibernate.show-sql", env.getProperty("spring.jpa.show-sql"));
        properties.put("hibernate.temp.use_jdbc_metadata_defaults",
                env.getProperty("spring.jpa.use_jdbc_metadata_defaults." + NAME));

        properties.put("hibernate.physical_naming_strategy", SpringPhysicalNamingStrategy.class.getName());
        properties.put("hibernate.implicit_naming_strategy", SpringImplicitNamingStrategy.class.getName());

        em.setJpaPropertyMap(properties);

        return em;
    }

    @Bean(name = "dataSource")
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(env.getProperty("spring.datasource.driver-class-name"));
        dataSource.setUrl(env.getProperty("spring.datasource.url"));
        dataSource.setUsername(env.getProperty("spring.datasource.username"));
        dataSource.setPassword(env.getProperty("spring.datasource.password"));

        return dataSource;
    }

    @Bean(name = "transactionManager")
    public PlatformTransactionManager transactionManager() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManager().getObject());
        return transactionManager;
    }
}

所以对于你的错误，可能尝试使用 LocalContainerEntityManagerFactoryBean 而不是 EntityManagerFactoryBuilder

Spring 引导说没有可用的名为 'entityManagerFactory' 的 bean

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