多个数据源启动

我尝试了几个小时才能使它正常工作，请查看文档：

https://docs.spring.io/spring-boot/docs/current/reference/html/howto-data-access.html

...各种stackoverflow问题以及我能找到的其他很多东西。但是，事实证明这是难以捉摸的（阅读，让我想把头撞在墙上）。任何帮助都会如此，非常欢迎！

我需要连接到两个不同的数据库（听起来够简单吗？），并且我有一个使用spring-boot-starter-data-jpa依赖项的Spring Boot Web应用程序，它可以通过单个数据源很好地解决问题。现在，我需要谈谈第二个数据库，但一切都没有进行。我以为我可以使用它一段时间，但事实证明一切都在主数据库中。

我目前正在尝试在一个单独的“缩减”项目中进行此操作，以尝试减少运动部件的数量，但仍无法正常工作。

我有两个@Configuration类-每个数据源一个，这是第一个：

@Configuration
@EnableJpaRepositories(
        entityManagerFactoryRef = "firstEntityManagerFactory",
        transactionManagerRef = "firstTransactionManager",
        basePackages = {"mystuff.jpaexp.jpatest"})
public class DataConfiguration {
    @Bean
    @Primary
    @ConfigurationProperties(prefix = "app.datasource1")
    public DataSourceProperties firstDataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean
    @Primary
    @ConfigurationProperties("app.datasource1")
    public DataSource firstDataSource() {
        return firstDataSourceProperties().initializeDataSourceBuilder().
                driverClassName("org.postgresql.Driver").
                url("jdbc:postgresql://localhost:5432/experiment1").
                username("postgres").
                password("postgres").
                build();
    }

    @Primary
    @Bean
    public LocalContainerEntityManagerFactoryBean firstEntityManagerFactory() {
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setGenerateDdl(true);

        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
        factory.setJpaVendorAdapter(vendorAdapter);
        factory.setPackagesToScan("mystuff.jpaexp.jpatest");
        factory.setDataSource(firstDataSource());
        factory.setPersistenceUnitName("ds1");
        return factory;
    }

    @Primary
    @Bean
    public PlatformTransactionManager firstTransactionManager() {
        return new JpaTransactionManager();
    }
}

这是第二个：

@Configuration
@EnableJpaRepositories(
        entityManagerFactoryRef = "secondEntityManagerFactory",
        transactionManagerRef = "secondTransactionManager",
        basePackages = {"mystuff.jpaexp.jpatest2"})
public class Otherconfiguration {
    @Bean
    @ConfigurationProperties(prefix = "app.datasource2")
    public DataSourceProperties secondDataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean
    @ConfigurationProperties("app.datasource2")
    public DataSource secondDataSource() {
        return secondDataSourceProperties().initializeDataSourceBuilder().
                driverClassName("org.postgresql.Driver").
                url("jdbc:postgresql://localhost:5432/experiment2").
                username("postgres").
                password("postgres").
                build();
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean secondEntityManagerFactory() {
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setGenerateDdl(true);

        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
        factory.setJpaVendorAdapter(vendorAdapter);
        factory.setPackagesToScan("mystuff.jpaexp.jpatest2");
        factory.setDataSource(secondDataSource());
        factory.setPersistenceUnitName("ds2");
        return factory;
    }

    @Bean
    public PlatformTransactionManager secondTransactionManager() {
        return new JpaTransactionManager();
    }
}

在每两个包的mystuff.jpaexp.jpatest和mystuff.jpaexp.jpatest2我有一个简单@Entity而CrudRepository应该连同第一和第二分别数据源去。

然后，我main()可以测试一下：

@SpringBootApplication
@EnableAutoConfiguration(exclude = {WebMvcAutoConfiguration.class})
@ComponentScan("mystuff.jpaexp.*")
public class SpringbootCommandLineApp implements CommandLineRunner {
    private final MyRepository myRepository;
    private final OtherRepo otherRepo;

    @Autowired
    public SpringbootCommandLineApp(MyRepository myRepository, OtherRepo otherRepo) {
        this.myRepository = myRepository;
        this.otherRepo = otherRepo;
    }

    public static void main(String[] args) {
        new SpringApplicationBuilder(SpringbootCommandLineApp.class)
                .web(false)
                .run(args);
    }

    @Override
    public void run(String... args) throws Exception {
        myRepository.save(new MyEntity("Goodbye or hello"));
        myRepository.save(new MyEntity("What?"));
        myRepository.save(new MyEntity("1,2,3..."));

        myRepository.findAll().forEach(System.out::println);

        otherRepo.save(new MyEntity2("J Bloggs"));
        otherRepo.save(new MyEntity2("A Beecher"));
        otherRepo.save(new MyEntity2("C Jee"));

        otherRepo.findAll().forEach(x -> {
            System.out.println("Name:" + x.getName() + ", ID: " + x.getId());
        });
    }
}

最后，一些道具在application.properties：

app.datasource1.driver-class-name=org.postgresql.Driver
app.datasource1.url=jdbc:postgresql://localhost:5432/experiment1
app.datasource1.username=postgres
app.datasource1.password=postgres

app.datasource2.driver-class-name=org.postgresql.Driver
app.datasource2.url=jdbc:postgresql://localhost:5432/experiment2
app.datasource2.username=postgres
app.datasource2.password=postgres

这些绝对没有效果-事情似乎仍然是由配置的spring.datasource.*，这显然没有用。

最终输出：

2018-05-25 17:04:00.797  WARN 29755 --- [           main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).
2018-05-25 17:04:00.800  INFO 29755 --- [           main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2018-05-25 17:04:00.803 ERROR 29755 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

Cannot determine embedded database driver class for database type NONE

Action:

If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).


Process finished with exit code 1

我知道这里有很多代码，对不起，谢谢！