Spring BootBeginner7 min read2026-03-01

Spring Boot with MongoDB

Build reactive and document-based microservices using Spring Data MongoDB and MongoRepository.

Prerequisites

MongoDB instance running locally or MongoDB Atlas connection URI

1. Spring Data MongoDB Starter

Add spring-boot-starter-data-mongodb dependency.

xml

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

2. Mongo Document Definition

Annotate domain models with @Document and @Id.

java

@Document(collection = "logs")
public class ErrorLog {
    @Id
    private String id;
    private String serviceName;
    private String errorMessage;
    private Instant timestamp = Instant.now();

    // Getters and Setters
}

Best Practices & Architecture Advice

Create compound indexes using @CompoundIndex for frequent multi-field queries.

Common Mistakes to Watch Out For

•Treating MongoDB like a relational database with heavy cross-collection lookups.

Frequently Asked Questions

How do I configure connection strings for MongoDB Atlas?

Set spring.data.mongodb.uri=mongodb+srv://<user>:<password>@cluster.mongodb.net/dbname in application.properties.