Question

在xml格式中，您可以定义一些代码，以便设置两个数据源而不会出现问题：

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
    </property>
</bean>

<bean id="dataSource" class="com.zangland.routing.RoutingDataSource">
    <property name="targetDataSources">
        <map key-type="com.zangland.routing.DbType">
            <entry key="MASTER" value-ref="dataSourceMaster"/>
            <entry key="REPLICA" value-ref="dataSourceReplica"/>
        </map>
    </property>
    <property name="defaultTargetDataSource" ref="dataSourceMaster"/>
</bean>

如果我尝试在这样的java中转换它，它会产生错误

@Configuration
@EnableJpaRepositories(entityManagerFactoryRef = "masterEntityManager", transactionManagerRef = "masterTransactionManager")
public class DataSourceConfiguration {
    @Bean(name = "masterEntityManager")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(){
        JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource());
        em.setPackagesToScan(new String[] {"com.zangland"});
        em.setJpaVendorAdapter(vendorAdapter);
        em.setJpaProperties(additionalJpaProperties());
        em.setPersistenceUnitName("master");

        return em;
    }

    @Bean(name = "masterTransactionManager")
    public JpaTransactionManager transactionManager(EntityManagerFactory masterEntityManager){
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(masterEntityManager);

        return transactionManager;
    }

    @Bean
    public RoutingDataSource dataSource() {
        RoutingDataSource dataSource = new RoutingDataSource();
        Map<Object, Object> dataSourceMap = new HashMap<Object, Object>();
        dataSourceMap.put(DbType.MASTER, dataSourceMaster());
        dataSourceMap.put(DbType.REPLICA, dataSourceReplica());
        dataSource.setTargetDataSources(dataSourceMap);
        dataSource.setDefaultTargetDataSource(dataSourceMaster());
        dataSource.afterPropertiesSet();
        return dataSource;
    }

，错误如下：

org.springframework.beans.factory.BeanCreationException：错误创建名为＆＃39; masterEntityManager＆＃39;的bean在类路径中定义 resource [com / zangland / routing / DataSourceConfiguration.class]：Bean 通过工厂方法实例化失败;嵌套异常是 org.springframework.beans.BeanInstantiationException：失败实例 [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean]：工厂方法＆＃39; entityManagerFactory＆＃39;抛出异常;嵌套异常是org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; dataSource＆＃39;的bean时出错在类路径中定义 resource [com / zangland / routing / DataSourceConfiguration.class]：Bean 通过工厂方法实例化失败;嵌套异常是 org.springframework.beans.BeanInstantiationException：失败实例化[com.zangland.routing.RoutingDataSource]：工厂方法＆＃39;数据源＆＃39;抛出异常;嵌套异常是 org.springframework.beans.factory.BeanCreationException：错误创建名为＆＃39; dataSourceMaster＆＃39;的bean在类路径中定义资源[com / zangland / routing / DataSourceConfiguration.class]： bean的初始化失败;嵌套异常是 org.springframework.beans.factory.BeanCreationException：错误使用名称＆＃39; dataSourceInitializer创建bean＆＃39 ;: init的调用方法失败;嵌套异常是 org.springframework.beans.factory.BeanCreationException：错误创建名为＆＃39; routingDataSource＆＃39;的bean在文件中定义 [C：\工作空间\路由数据springboot \目标\类\ COM \ zangland \路由\ RoutingDataSource.class]：调用init方法失败;嵌套异常是 java.lang.IllegalArgumentException：Property＆＃39; targetDataSources＆＃39;是需要

如何在java LocalContainerEntityManagerFactoryBean中设置两个数据源？

0 个答案: