connect spring boot with mongodb using java class

Question

I have this structure

project (module.pom)
- connection (module.jar)
 - src/main/java
 -com.mycompany.connection
 -connectionBD.class
 - ...
 - pom.xml
- person (module.jar)
 - src/main/java
 - com.mycompany.person
 -personApplication.class
 - com.mycompany.person.controller
 -...
 - com.mycompany.person.model
 -...
 - src/main/resources
 - ...
 - pom.xml
pom.xml

my connectionBD.class class is this.

@Configuration
public class connectionBD {
 @Bean
 public MongoDatabaseFactory mongoDatabaseFactory(){
 return new SimpleMongoClientDatabaseFactory("mongo://localhost:27017/lydsam");
 }
 @Bean
 public MongoTemplate mongoTemplate() {
 return new MongoTemplate(mongoDatabaseFactory());
 }
}

and my PersonApplication.class class that is in another module.

@SpringBootApplication(scanBasePackages = { "com.mycompany.person", "com.mycompany.connection" })
public class PersonApplication {
 public static void main(String[] args) {
 try {
 SpringApplication.run(PersonApplication.class, args);
 } catch (Exception e) {
 System.out.println("Error: "+ e.getMessage());
 }
 }
}

When I run the project, I get an error saying that my connection to my database is wrong and I don't know what the problem is. Somebody could help me.

Error message

nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongoTemplate' defined in class path resource [com/mycompany/connection/connectionBD.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.mongodb.core.MongoTemplate]: Factory method 'mongoTemplate' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongoDatabaseFactory' defined in class path resource [com/mycompany/connection/connectionBD.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.mongodb.MongoDatabaseFactory]: Factory method 'mongoDatabaseFactory' threw exception; nested exception is java.lang.IllegalArgumentException: The connection string is invalid. Connection strings must start with either 'mongodb://' or 'mongodb+srv://

• CarlosJavier: Could you please share the log?
• M. Deinum: Remove your connectionDB class/configuration and let Spring Boot do it. Just add the spring.data.mongodb.uri=<your-config-url> and Spring Boot will set things up for you. See docs.spring.io/spring-boot/docs/current/reference/html/…

Answer 1

Connection strings must start with either 'mongodb://' or 'mongodb+srv://

You need to edit. mongo -> mongodb SimpleMongoClientDatabaseFactory

@Configuration
public class connectionBD {
 @Bean
 public MongoDatabaseFactory mongoDatabaseFactory(){
 return new SimpleMongoClientDatabaseFactory("mongodb://localhost:27017/lydsam");
 }
}

• Kusum: OR SimpleMongoClientDbFactory if you are using older version