Spring Boot multiple MongoDB configuration - spring

Question

I have looked everywhere for this and it seems like I cannot find a solution that works. I am using spring boot 1.5.10-RELEASE. I am trying to configure two different mongodb instances in the same application. Here is my code:
Main Application:
#SpringBootApplication(exclude = {MongoAutoConfiguration.class})
#ComponentScan("com.reef.reports")
public class MainApplication
{
public static void main(String[] args)
{
SpringApplication.run(MainApplication.class, args);
}
}
1st Instance
#Configuration
#EnableMongoRepositories(basePackages = {"com.reef.repository.mongousa"} , mongoTemplateRef = "USAMongo")
public class MongoUsaConfig
{
#Value("${usa.mongodb.host}")
private String host;
#Value("${usa.mongodb.database:reef}")
private String database;
#Value("${usa.mongodb.port:27017}")
private int port;
#Value("${usa.mongodb.username:}")
private String username;
#Value("${usa.mongodb.password:}")
private String password;
#Value("${usa.mongodb.authdb:}")
private String authdb;
private final List<MongoCredential> credentials = new ArrayList<>();
private final List<ServerAddress> hosts = new ArrayList<>();
/**
* Method that creates MongoDbFactory
* Common to both of the MongoDb connections
*/
public MongoDbFactory mongoDbFactory()
{
return new SimpleMongoDbFactory(getMongoClient(), database);
}
/**
* Method that creates MongoClient
*/
#Bean(name = "USAClient")
public MongoClient getMongoClient()
{
if ((null != username)&&(!username.isEmpty()))
{
hosts.add(new ServerAddress(host, port));
credentials.add(MongoCredential.createMongoCRCredential(username, authdb, password.toCharArray()));
return new MongoClient(hosts, credentials);
}
else
{
return new MongoClient(host, port);
}
}
#Primary
#Bean(name = "USAMongo")
public MongoTemplate getMongoTemplate()
{
return new MongoTemplate(mongoDbFactory());
}
}
2nd Instance
#Configuration
#EnableMongoRepositories(basePackages = {"com.reef.repository.mongocan"} , mongoTemplateRef = "CANMongo")
public class MongoCanConfig
{
#Value("${can.mongodb.host}")
private String host;
#Value("${can.mongodb.database:reef}")
private String database;
#Value("${can.mongodb.port:27017}")
private int port;
#Value("${can.mongodb.username:}")
private String username;
#Value("${can.mongodb.password:}")
private String password;
#Value("${can.mongodb.authdb:}")
private String authdb;
private final List<MongoCredential> credentials = new ArrayList<>();
private final List<ServerAddress> hosts = new ArrayList<>();
/**
* Method that creates MongoDbFactory
* Common to both of the MongoDb connections
*/
public MongoDbFactory mongoDbFactory()
{
return new SimpleMongoDbFactory(getMongoClient(), database);
}
/**
* Method that creates MongoClient
*/
#Bean(name = "CANClient")
public MongoClient getMongoClient()
{
if ((null != username)&&(!username.isEmpty()))
{
hosts.add(new ServerAddress(host, port));
credentials.add(MongoCredential.createMongoCRCredential(username, authdb, password.toCharArray()));
return new MongoClient(hosts, credentials);
}
else
{
return new MongoClient(host, port);
}
}
#Bean(name = "CANMongo")
public MongoTemplate getMongoTemplate()
{
return new MongoTemplate(mongoDbFactory());
}
}
When I run the application, it will run the configuration for the first instance. However, it will not pick up the second instance. I have put in breakpoints to debug and it never hits the breakpoint in the configuration. The repositories in this package get loaded correctly:
com.reef.repository.mongousa
The errors happen with the repositories in this package:
com.reef.repository.mongocan
Please let me know what I am missing. Why does one config work and the other does not?

Answer 1

Refer to this blog post https://medium.com/#joeclever/using-multiple-datasources-with-spring-boot-and-spring-data-6430b00c02e7
I tried it out for two MySQL DataBases and it is working fine.