Spring Data MongoDB Hello World Example

In this Post we will see how to Integrate Spring Data + MongoDB + Maven step by step.
To integrate Spring with MongoDB we require Spring Data and Mongo DB jars.

Below is the Content for Pom.xml:

Below Pom.xml Contains the Spring and MongoDB maven dependency configuration.

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mahesh.common</groupId>

    <artifactId>SpringMongoDBExample</artifactId>

    <packaging>jar</packaging>

    <version>1.0</version>

    <name>SpringMongoExample</name>

    <url>http://maven.apache.org</url>

    <dependencies>

        <!-- Spring framework -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-core</artifactId>

            <version>3.2.2.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context</artifactId>

            <version>3.2.2.RELEASE</version>

        </dependency>

        <!-- mongodb java driver -->

        <dependency>

            <groupId>org.mongodb</groupId>

            <artifactId>mongo-java-driver</artifactId>

            <version>2.11.0</version>

        </dependency>

        <!-- Spring data mongodb -->

        <dependency>

            <groupId>org.springframework.data</groupId>

            <artifactId>spring-data-mongodb</artifactId>

            <version>1.2.0.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>cglib</groupId>

            <artifactId>cglib</artifactId>

            <version>2.2.2</version>

        </dependency>

    </dependencies>

    <build>

        <finalName>SpringMongoDBExample</finalName>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <version>2.0.2</version>

                <configuration>

                    <source>1.6</source>

                    <target>1.6</target>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

Below is the Content for HelloWorldExample.java

package com.mahesh.spring;

import java.util.List;

import org.springframework.context.ApplicationContext;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import org.springframework.data.mongodb.core.MongoOperations;

import org.springframework.data.mongodb.core.query.Criteria;

import org.springframework.data.mongodb.core.query.Query;

import org.springframework.data.mongodb.core.query.Update;

import com.mahesh.config.SpringMongoConfig;

import com.mahesh.model.User;

//import org.springframework.context.support.GenericXmlApplicationContext;

public class HelloWorldExample {

public static void main(String[] args) {

// For XML

//ApplicationContext ctx = new GenericXmlApplicationContext("SpringConfig.xml");

// For Annotation

ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringMongoConfig.class);

MongoOperations mongoOperation = (MongoOperations) ctx.getBean("mongoTemplate");

User user = new User("mahesh", "password123");

// save

mongoOperation.save(user);

// now user object got the created id.

System.out.println("1. user : " + user);

// query to search user

Query searchUserQuery = new Query(Criteria.where("username").is("mahesh"));

// find the saved user again.

User savedUser = mongoOperation.findOne(searchUserQuery, User.class);

System.out.println("2. find - savedUser : " + savedUser);

// update password

mongoOperation.updateFirst(searchUserQuery, Update.update("password", "new password"),

User.class);

// find the updated user object

User updatedUser = mongoOperation.findOne(

new Query(Criteria.where("username").is("mahesh")), User.class);

System.out.println("3. updatedUser : " + updatedUser);

// delete

//mongoOperation.remove(searchUserQuery, User.class);

// List, it should be empty now.

List<User> listUser = mongoOperation.findAll(User.class);

System.out.println("4. Number of user = " + listUser.size());

}

}

Below is the Content for SpringMongoConfig.java

package com.mahesh.config;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.data.mongodb.MongoDbFactory;

import org.springframework.data.mongodb.core.MongoTemplate;

import org.springframework.data.mongodb.core.SimpleMongoDbFactory;

import com.mongodb.MongoClient;

@Configuration

public class SpringMongoConfig {

public @Bean

MongoDbFactory mongoDbFactory() throws Exception {

return new SimpleMongoDbFactory(new MongoClient(), "mahesh");

}

public @Bean

MongoTemplate mongoTemplate() throws Exception {

MongoTemplate mongoTemplate = new MongoTemplate(mongoDbFactory());

return mongoTemplate;

}

}

Below is the Content for Spring Configuration file SpringConfig.xml

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

xmlns:context="http://www.springframework.org/schema/context"

xmlns:mongo="http://www.springframework.org/schema/data/mongo"

xsi:schemaLocation="http://www.springframework.org/schema/context

          http://www.springframework.org/schema/context/spring-context-3.0.xsd

          http://www.springframework.org/schema/data/mongo

          http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd

          http://www.springframework.org/schema/beans

          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<mongo:mongo host="127.0.0.1" port="27017" />

<mongo:db-factory dbname="mahesh" />

<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">

<constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />

</bean>

</beans>

OutPut:

1. user : User [id=53ff4fbd1da74f81ce7b5877, username=mahesh, password=password123]

2. find - savedUser : User [id=53ff4f2f1da7367f5fc43e0f, username=mahesh, password=new password]

3. updatedUser : User [id=53ff4f2f1da7367f5fc43e0f, username=mahesh, password=new password]

4. Number of user = 2