Spring Boot. Multiple datasources configuration example

DatabasesConfig.java

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableConfigurationProperties({
	DatabasesConfig.DataSourceOneProperties.class,
	DatabasesConfig.DataSourceTwoProperties.class})
public class DatabasesConfig {
	@Autowired
	DataSourceOneProperties dsOneProperties;
	@Autowired
	DataSourceTwoProperties dsTwoProperties;
	
	@Bean @Qualifier("ds_one")
	public DataSource dataSourceOne() {
		return createDataSource(dsOneProperties);
	}
	
	@Bean @Qualifier("ds_two")
	public DataSource dataSourceTwo() {
		return createDataSource(dsTwoProperties);
	}

	private DataSource createDataSource(BaseDataSourceProperties properties) {
		DataSourceBuilder factory = DataSourceBuilder
				.create(properties.getClassLoader())
				.driverClassName(properties.getDriverClassName())
				.url(properties.getUrl())
				.username(properties.getUsername())
				.password(properties.getPassword());
		return factory.build();
	}
	
	@ConfigurationProperties(prefix = "appName.dbOne.datasource")
	static class DataSourceOneProperties extends BaseDataSourceProperties {}
	
	@ConfigurationProperties(prefix = "appName.dbTwo.datasource")
	static class DataSourceTwoProperties extends BaseDataSourceProperties {}
	
}

Where do you get BaseDataSourceProperties from?

BaseDataSourceProperties is nothing more than descendant of org.springframework.boot.autoconfigure.jdbc.DataSourceProperties with getDriverClassName method overriden to make it public.