Spring Boot unable to scan MongoRepository-CodePudding

I have a persistance interface that implements MongoRepository interface that looks as follows:

package org.prithvidiamond1.DB.Repositories;

import org.prithvidiamond1.DB.Models.SomeModel;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface ServerRepository extends MongoRepository<SomeModel, String> {
}

Despite this, I keep getting the following error:

Exception encountered during context initialization - cancelling refresh attempt:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'botApplication': 
Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No qualifying bean of type 'org.prithvidiamond1.DB.Repositories.ServerRepository' available: expected at least 1 bean which qualifies as autowire candidate.
Dependency annotations: {}


PPLICATION FAILED TO START
***************************

Description:

Parameter 0 of constructor in org.prithvidiamond1.BotApplication required a bean of type 'org.prithvidiamond1.DB.Repositories.ServerRepository' that could not be found.


Action:

Consider defining a bean of type 'org.prithvidiamond1.DB.Repositories.ServerRepository' in your configuration.

I have tried many solutions (custom @ComponentScan, using @Service instead of @Component, etc.) I found on the internet but none could help me solve the problem, can someone explain to me what is wrong and how I should fix this?

Note: The directory structure is as follows (this is not the full directory structure, but I think this should be enough to get an idea):

org.prithvidiamond1
   |
    --BotApplication.java
   |
    --DB
      |
       --Repository
      |
       --ServerRepository.java

BotApplication.java looks as follows:

package org.prithvidiamond1;

import org.jc.api.Api;
import org.jc.api.ApiBuilder;
import org.jc.api.entity.server.Server;
import org.prithvidiamond1.DB.Models.Server;
import org.prithvidiamond1.DB.Repositories.ServerRepository;
import org.slf4j.Logger;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

import java.util.Collection;

@Component
public class BotApplication {
    private final Api api;
    private final ServerRepository serverRepository;

    public BotApplication(ServerRepository serverRepository, Logger logger){
        String botToken = System.getenv().get("BOT_TOKEN");

        this.api = new ApiBuilder();

        this.serverRepository = serverRepository;

        appRuntime(logger);
    }

    public void appRuntime(Logger logger){
        logger.info("Bot has started!");

        // Handling server entries in the database
        if (this.serverRepository.findAll().isEmpty()) {
            logger.trace("server data repository empty, initializing data repository...");
            Collection<Server> servers = api.getServers();
            for (Server server : servers) {
                this.serverRepository.save(new Server(String.valueOf(server.getId())));
            }
            logger.trace("server data repository initialized");
        }
    }

    @Bean
    public Api getApi() {
        return this.api;
    }
}

CodePudding user response：

use annotation @Autowired with the constructor of BotApplication class as shown below -

@Autowired
public BotApplication(ServerRepository serverRepository, Logger logger){
        String botToken = System.getenv().get("BOT_TOKEN");

        this.api = new ApiBuilder();

        this.serverRepository = serverRepository;

        appRuntime(logger);
    }

CodePudding user response：

You need to use @EnableMongoRepositories on top of your main application class to enable scanning of mongo repository beans.

CodePudding user response：

You have Created Repository bean (ServerRepository)within your application.

But in your BotApplication component (which itself is a bean), you are not telling spring to inject dependency of Repository bean (i.e. Dependancy Injection).

Such a dependancy injection can be achieved by constructor , field-based or setter based methodologies.

You can either remove ServerRepository serverRepository from public BotApplication(ServerRepository serverRepository, Logger logger) constructor & just use :

@Autowired
private final ServerRepository serverRepository;

Or as other answer suggested, use @Autowired in Constructor itself and remove field ServerRepository serverRepository :

`
@Autowired
public BotApplication(ServerRepository serverRepository, Logger logger)
`

Please note, here, this.serverRepository = serverRepository; is also not required in constructor as dependency injection will take care of this.