春季启动多个EntityManagerFactories NoUniqueBeanDefinitionException

Question

我创建从http://start.spring.io/一个简单的项目（1.3.2 WEB，JPA） 并试图创建两个EntityManager的，但我得到下面的异常。任何想法什么是错的，或者我怎么能得到它的工作？

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'transactionManager' defined in class path resource [com/example/SecondDataSourceConfiguration.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [javax.persistence.EntityManagerFactory]: : No qualifying bean of type [javax.persistence.EntityManagerFactory] is defined: expected single matching bean but found 2: entityManagerFactoryFirst,entityManagerFactorySecond; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [javax.persistence.EntityManagerFactory] is defined: expected single matching bean but found 2: entityManagerFactoryFirst,entityManagerFactorySecond 
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:464) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE] 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE] 
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE] 
    at com.example.DemoApplication.main(DemoApplication.java:12) [classes/:na] 
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [javax.persistence.EntityManagerFactory] is defined: expected single matching bean but found 2: entityManagerFactoryFirst,entityManagerFactorySecond 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1126) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:813) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE] 
    ... 19 common frames omitted 

FristDataSourceConfiguration

package com.example; 

import java.beans.PropertyVetoException; 
import java.sql.SQLException; 
import java.util.HashMap; 
import java.util.Map; 

import javax.persistence.EntityManagerFactory; 
import javax.persistence.PersistenceContext; 
import javax.sql.DataSource; 

import org.springframework.context.annotation.Bean; 
import org.springframework.context.annotation.Configuration; 
import org.springframework.context.annotation.Primary; 
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabase; 
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder; 
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType; 
import org.springframework.orm.jpa.JpaTransactionManager; 
import org.springframework.orm.jpa.JpaVendorAdapter; 
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean; 
import org.springframework.orm.jpa.vendor.Database; 
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter; 
import org.springframework.transaction.PlatformTransactionManager; 
import org.springframework.transaction.annotation.EnableTransactionManagement; 

@Configuration 
@EnableTransactionManagement 
public class FristDataSourceConfiguration { 

    @Bean 
    @Primary 
    public DataSource dataSource() throws SQLException { 

     EmbeddedDatabaseBuilder builder = new EmbeddedDatabaseBuilder(); 
     EmbeddedDatabase db = builder.setType(EmbeddedDatabaseType.H2).build(); 
     return db; 
    } 

    @PersistenceContext(unitName = "first") 
    @Bean(name = "entityManagerFactoryFirst") 
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws PropertyVetoException, SQLException { 
     LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean(); 
     emf.setDataSource(dataSource()); 
     emf.setJpaVendorAdapter(vendorAdapter()); 
     emf.setPersistenceUnitName("first"); 
     emf.setPackagesToScan("com.demo.domain"); 
     emf.setJpaPropertyMap(getJpaProperties()); 

     return emf; 
    } 

    public Map<String, String> getJpaProperties() { 

     Map<String, String> jpaMap = new HashMap<String, String>(); 
     jpaMap.put("hibernate.cache.use_query_cache", "false"); 
     jpaMap.put("hibernate.cache.use_second_level_cache", "false"); 
     return jpaMap; 
    } 

    @Bean 
    public PlatformTransactionManager transactionManager(EntityManagerFactory emf) { 
     JpaTransactionManager transactionManager = new JpaTransactionManager(); 
     transactionManager.setEntityManagerFactory(emf); 

     return transactionManager; 
    } 

    public JpaVendorAdapter vendorAdapter() { 
     HibernateJpaVendorAdapter hibernateJpaVendorAdapter = new HibernateJpaVendorAdapter(); 
     hibernateJpaVendorAdapter.setShowSql(true); 
     hibernateJpaVendorAdapter.setGenerateDdl(true); 
     hibernateJpaVendorAdapter.setDatabase(Database.H2); 
     return hibernateJpaVendorAdapter; 
    } 
} 

SecondDataSourceConfiguration

package com.example; 

import java.beans.PropertyVetoException; 
import java.sql.SQLException; 
import java.util.HashMap; 
import java.util.Map; 

import javax.persistence.EntityManagerFactory; 
import javax.persistence.PersistenceContext; 
import javax.sql.DataSource; 

import org.springframework.context.annotation.Bean; 
import org.springframework.context.annotation.Configuration; 
import org.springframework.context.annotation.Primary; 
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabase; 
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder; 
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType; 
import org.springframework.orm.jpa.JpaTransactionManager; 
import org.springframework.orm.jpa.JpaVendorAdapter; 
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean; 
import org.springframework.orm.jpa.vendor.Database; 
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter; 
import org.springframework.transaction.PlatformTransactionManager; 
import org.springframework.transaction.annotation.EnableTransactionManagement; 

@Configuration 
@EnableTransactionManagement 
public class SecondDataSourceConfiguration { 

    @Bean 
    @Primary 
    public DataSource dataSource() throws SQLException { 

     EmbeddedDatabaseBuilder builder = new EmbeddedDatabaseBuilder(); 
     EmbeddedDatabase db = builder.setType(EmbeddedDatabaseType.H2).build(); 
     return db; 
    } 

    @PersistenceContext(unitName = "second") 
    @Bean(name = "entityManagerFactorySecond") 
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws PropertyVetoException, SQLException { 
     LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean(); 
     emf.setDataSource(dataSource()); 
     emf.setJpaVendorAdapter(vendorAdapter()); 
     emf.setPersistenceUnitName("second"); 
     emf.setPackagesToScan("com.demo.domain"); 
     emf.setJpaPropertyMap(getJpaProperties()); 

     return emf; 
    } 

    public Map<String, String> getJpaProperties() { 

     Map<String, String> jpaMap = new HashMap<String, String>(); 
     jpaMap.put("hibernate.cache.use_query_cache", "false"); 
     jpaMap.put("hibernate.cache.use_second_level_cache", "false"); 
     return jpaMap; 
    } 

    @Bean 
    public PlatformTransactionManager transactionManager(EntityManagerFactory emf) { 
     JpaTransactionManager transactionManager = new JpaTransactionManager(); 
     transactionManager.setEntityManagerFactory(emf); 

     return transactionManager; 
    } 

    public JpaVendorAdapter vendorAdapter() { 
     HibernateJpaVendorAdapter hibernateJpaVendorAdapter = new HibernateJpaVendorAdapter(); 
     hibernateJpaVendorAdapter.setShowSql(true); 
     hibernateJpaVendorAdapter.setGenerateDdl(true); 
     hibernateJpaVendorAdapter.setDatabase(Database.H2); 
     return hibernateJpaVendorAdapter; 
    } 
} 

的pom.xml

<?xml version="1.0" encoding="UTF-8"?> 
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 

    <groupId>com.example</groupId> 
    <artifactId>demo</artifactId> 
    <version>0.0.1-SNAPSHOT</version> 
    <packaging>jar</packaging> 

    <name>demo</name> 
    <description>Demo project for Spring Boot</description> 

    <parent> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-parent</artifactId> 
     <version>1.3.2.RELEASE</version> 
     <relativePath/> <!-- lookup parent from repository --> 
    </parent> 

    <properties> 
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
     <java.version>1.8</java.version> 
    </properties> 

    <dependencies> 
     <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.springframework.boot</groupId> 
      <artifactId>spring-boot-starter-test</artifactId> 
      <scope>test</scope> 
     </dependency> 

     <dependency> 
      <groupId>com.h2database</groupId> 
      <artifactId>h2</artifactId> 
      <version>1.4.191</version> 
     </dependency> 

    </dependencies> 

    <build> 
     <plugins> 
      <plugin> 
       <groupId>org.springframework.boot</groupId> 
       <artifactId>spring-boot-maven-plugin</artifactId> 
      </plugin> 
     </plugins> 
    </build> 


</project> 

Answer 1

首先，我需要排除我的主文件中的HibernateJpaAutoConfiguration。

@SpringBootApplication(exclude = HibernateJpaAutoConfiguration.class) 

和第二，我需要添加@Qualifier注解

@Bean 
    public PlatformTransactionManager transactionManager(@Qualifier("entityManagerFactorySecond") EntityManagerFactory emf) { 
     JpaTransactionManager transactionManager = new JpaTransactionManager(); 
     transactionManager.setEntityManagerFactory(emf); 

     return transactionManager; 
    } 

Answer 2

你的方法

public PlatformTransactionManager transactionManager(EntityManagerFactory emf) 

预计一个EntityManagerFactory的，你创建两个。 您可以使用@Qualifer来配置在哪里进行。 你也应该禁用DataSourceAutoConfiguration，所以spring不会创建一个。 在这里看到一个完整的教程： Configuring Multiple JPA Entity Managers In Spring Boot