Connecting Java Sping-boot gradle to MongoDB

The most professional approach is to have the database run in parallel with the application.

You need to configure the build.gradle file

dependencies {
    // For data persistence
    implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'
    // In order to create drivers and test the connection
    implementation 'org.springframework.boot:spring-boot-starter-web'
}

---

Connection in application.properties:

# Spring will automatically connect to the process you started with Brew
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=championship_robot_db

or alternatively resources/application.yaml

spring:
  application:
    name: championshipfunctions
  data:
    mongodb:
      host: localhost
      port: 27017
      database: championship_db
gradle:
  org:
    gradle:
      java:
        home: "/opt/homebrew/opt/openjdk@21" # for use java 21
server:
  port: 8081 # change the port

---

To ensure that the data is saved, create this small controller in your Java code:

@RestController
@RequestMapping("/test-mongo")
public class MongoTestController {

    @Autowired
    private MongoTemplate mongoTemplate;

    @GetMapping("/save")
    public String test() {
        var data = new HashMap<String, String>();
        data.put("message", "Successful connection!");
        data.put("timestamp", LocalDateTime.now().toString());
        
        mongoTemplate.save(data, "system_logs");
        return "Document saved successfully in MongoDB";
    }
}

---

structure:

---

with a visor of documents as MongoDB Compass

There you can see if MongoDB is working, view stored documents, and perform queries.

The database is NoSQL (you store elements as JSON)

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Run the Java Spring Boot Gradle application:

 JAVA_HOME=$(/usr/libexec/java_home -v 21) ./gradlew bootRun

or

 ./gradlew bootRun

gradlew comes with gradle, it comes with all the gradle commands, it’s a large script that makes gradle portable