Spring 启动多模块项目多数据源

Question

我正在尝试开发具有多数据源连接的多模块 spring 引导项目。我将这个项目分成 5 个模块： -springboot-multiple-maven-modules: 1.域-> database2的模型 2. domain2 -> database2的模型 3.持久化->database1的持久化 4. persistence2 -> database2的持久化 5. web -> 访问数据库1和数据库2

您可以在下面link下载代码： GitHub Project

我以这种方式配置了两个数据源： - 数据库 1：

package rc.persistence;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
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.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.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "hotelEntityManagerFactory", transactionManagerRef = "hotelTransactionManager", basePackages = {
        "rc.repository" }) //Mirar si se puede sustituir por rc.domain o rc.repository
public class HotelDbConfig {

    @Autowired
    private Environment env;

    @Bean(name = "hotelDataSource")
    @ConfigurationProperties(prefix = "hoteles.datasource")
    public DataSource customDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(env.getProperty("hoteles.datasource.driver-class-name"));
        dataSource.setUrl(env.getProperty("hoteles.datasource.url"));
        dataSource.setUsername(env.getProperty("hoteles.datasource.username"));
        dataSource.setPassword(env.getProperty("hoteles.datasource.password"));
        return dataSource;
    }

    @Bean(name = "hotelEntityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder,
            @Qualifier("hotelDataSource") DataSource dataSource) {
        return builder.dataSource(dataSource).packages("rc.domain")
                .persistenceUnit("hotel").build();
    }

    @Bean(name = "hotelTransactionManager")
    public PlatformTransactionManager transactionManager(
            @Qualifier("hotelEntityManagerFactory") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }
}

数据库2：

package rc.persistence2;
import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
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.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "cocheEntityManagerFactory", transactionManagerRef = "cocheTransactionManager", basePackages = {
        "rc.repository2" }) 

public class CocheDbConfig {

    @Autowired
    private Environment env;

    @Primary
    @Bean(name = "cocheDataSource")
    @ConfigurationProperties(prefix = "coches.datasource")
    public DataSource customDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(env.getProperty("coches.datasource.driver-class-name"));
        dataSource.setUrl(env.getProperty("coches.datasource.url"));
        dataSource.setUsername(env.getProperty("coches.datasource.username"));
        dataSource.setPassword(env.getProperty("coches.datasource.password"));
        return dataSource;
    }

    @Primary
    @Bean(name = "cocheEntityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder,
            @Qualifier("cocheDataSource") DataSource dataSource) {
        return builder.dataSource(dataSource).packages("rc.domain2")
                .persistenceUnit("coche").build();
    }

    @Primary
    @Bean(name = "cocheTransactionManager")
    public PlatformTransactionManager transactionManager(
            @Qualifier("cocheEntityManagerFactory") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }
}

但是当我尝试使用来自网络模块的存储库时：

package rc.web;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import rc.domain2.Coche;
import rc.persistence2.CocheRepository;

@RestController
public class CocheController {

    @Autowired
    private CocheRepository cocheRepository;

    public CocheController(CocheRepository cocheRepository) {
        this.cocheRepository = cocheRepository;
    }

    @GetMapping(value = "/coches")
    public List<Coche> getCoches() {
        List<Coche> hotels = this.cocheRepository.findAll();
        return hotels;
    }
}

它向我显示以下错误：

我尝试了不同的可能性，但结果总是一样的：

2018-09-27 17:08:58.399 WARN 15272 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'cocheController' defined in file [C:\springboot-multiple-maven-modules\web\target\classes\rc\web\CocheController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'rc.persistence2.CocheRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {} 2018-09-27 17:08:58.399 INFO 15272 --- [
main] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'coche' 2018-09-27 17:08:58.400 INFO 15272 --- [ main] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'hotel' 2018-09-27 17:08:58.403 INFO 15272 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat] 2018-09-27 17:08:58.421 INFO 15272 --- [ main] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2018-09-27 17:08:58.670 ERROR 15272 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :

*************************** APPLICATION FAILED TO START

Description:

Parameter 0 of constructor in rc.web.CocheController required a bean of type 'rc.persistence2.CocheRepository' that could not be found.

Action:

Consider defining a bean of type 'rc.persistence2.CocheRepository' in your configuration.

请帮忙！！

提前致谢！

Answer 1

您在数据源配置中遇到错误。您的 CocheDbConfig 数据源正在扫描基础包 "rc.repository2" 以查找存储库 class，因此它无法在您的控制器中找到 bean 'rc.persistence2.CocheRepository'。

您应该像这样更改 database2 数据源中的基础包

@EnableJpaRepositories(entityManagerFactoryRef = "cocheEntityManagerFactory", transactionManagerRef = "cocheTransactionManager", basePackages = {
        "rc.persistence2" })

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