配置多数据源 required a single bean, but 2 were found:

两个数据源的时候可以，加了一个 UserDb 就不行了

@Configuration
public class DruidConfig
{
    @Bean
    @ConfigurationProperties("spring.datasource.druid.master")
    public DataSource masterDataSource()
    {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean
    @Qualifier("userDbDataSource")
    @ConfigurationProperties("spring.datasource.druid.userDb")
    @ConditionalOnProperty(prefix = "spring.datasource.druid.userDb", name = "enabled", havingValue = "true")
    public DataSource userDbDataSource() {
        return DruidDataSourceBuilder.create().build();
    }


    @Bean
    @Qualifier("slaveDataSource")
    @ConfigurationProperties("spring.datasource.druid.slave")
    @ConditionalOnProperty(prefix = "spring.datasource.druid.slave", name = "enabled", havingValue = "true")
    public DataSource slaveDataSource()
    {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "dynamicDataSource")
    @Primary
    public DynamicDataSource dataSource(DataSource masterDataSource,  DataSource userDbDataSource , DataSource slaveDataSource)
    {
        Map<Object, Object> targetDataSources = new HashMap<>();
        targetDataSources.put(DataSourceType.MASTER.name(), masterDataSource);
        targetDataSources.put(DataSourceType.USERDB.name(), userDbDataSource);
        targetDataSources.put(DataSourceType.SLAVE.name(), slaveDataSource);
        return new DynamicDataSource(masterDataSource, targetDataSources);
    }