spring data mongodb configuration in spring boot based project

Question

I am writing code with spring boot which will take csv as input and create mongodb collection and insert it to mongodb.

Currently I am sticking in using mongodb in spring boot based code. I am getting NullPointerException while using save method on MongoRepository interface.

Probably this problem is due to incorrect configuration in application.yml file Below is mongodb specific changes in application.yml in src/main/resources directory.

spring:
   data:
      mongodb.host: localhost
      mongodb.port: 27017
      mongodb.uri: mongodb://localhost/test
      mongo.repositories.enabled: true

Application.java file is below:

@Configuration
@EnableMongoRepositories
@Import(RepositoryRestMvcConfiguration.class)
@EnableAutoConfiguration  // Sprint Boot Auto Configuration
@ComponentScan(basePackages = "com.khoubyari.example")
public class Application extends SpringBootServletInitializer {

private static final Class<Application> applicationClass = Application.class;
private static final Logger log = LoggerFactory.getLogger(applicationClass);

public static void main(String[] args) {
    SpringApplication.run(applicationClass, args);
}


@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.sources(applicationClass);
}
}

If Application.java implements CommandLineRunner and write mongodb insertion specific code in overrided method run, code is working fine. This code is available in this URL: https://spring.io/guides/gs/accessing-data-mongodb/

but, my Application.java extends SpringBootServletInitializer class and override configure(SpringApplicationBuilder application) method. Please look at above for my Application.java.

I need to use same db specific code (as in same code for which URL I mentioned above in Application.java class) in utility class existing in different package for my spring boot based project.

Custom repository interface is below:

CustomRepository.java:

public interface CustomRepository extends MongoRepository<CsvPojo, String>{

}

In utility class, I just want to inject CustomRepository and use save method to save created CsvPojo in mongodb. But I am geiing NullPointerException while executing line customRepository.save(csvPojo);

Please suggest! If other information is needed, please tell me!

Regards, Shobhit

First of all why is you Application class extending SpringBootServletInitializer? Second, please show the code you are using for your custom utility class — geoand
– geoand, Commented Oct 31, 2014 at 6:50
You cannot inject into a utility class (I suspect that class isn't spring managed or you have a static field you are trying to inject). Also in your configuration you can remove @EnableMongoRepositories and @Import(RepositoryRestMvcConfiguration.class), Spring Boot automatically adds those when respective Spring Data MongoDB and Spring Data Rest is detected. In addition if your Application class is in the com.khoubyari.example package you can just do @ComponentScan. — M. Deinum
– M. Deinum, Commented Oct 31, 2014 at 8:15

S Singh · Accepted Answer · 2014-10-31 07:59:09Z

4

Calling save method in spring rest controller resolved the issue in stead of calling from utility class.

I just inject CustomRepository interface in controller and using save method!

I got the solution after studying "About the Service" section from https://github.com/khoubyari/spring-boot-rest-example

I need to explore more in spring boot but anyways problem is resolved after above posted efforts!

answered Oct 31, 2014 at 7:59

S Singh

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