MongoDB - Replica Sets with Spring Data MongoDB (Part 3)

Review

In the previous section, we have installed and configured our servers for MongoDB replication. In this section, we will update our Spring application to support MongoDB Replica Sets.

Table of Contents

Part 1: Introduction
Part 2: Installation and configuration of Replica Sets
Part 3: Spring app configuration
Part 4: Testing the servers

Spring App Configuration

We have setup a MongoDB Replica Set using four servers, and we've examined the output from the logs and verified that all instances are running. Our next step is to configure our Spring MongoDB-base application.

Since we're reusing our application from the tutorial Spring MVC 3.1 - Implement CRUD with Spring Data MongoDB, adding a MongoDB Replica Set support in Spring is trivial. All we need to do is modify the spring.properties file with the following contents (this file is located under the WEB-INF directory):

	# database properties
	mongo.db.name=spring_mongodb_tutorial
	mongo.host.name=localhost
	mongo.host.port=27017
	mongo.replica.set=123.456.78.90:27017,123.456.78.91:27017,123.456.78.92:27017,123.456.78.93:27017

view raw spring.properties hosted with ❤ by GitHub

Then we have to modify as well the spring-data.xml file with the following updates:

	<?xml version="1.0" encoding="UTF-8"?>
	<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:p="http://www.springframework.org/schema/p"
	xmlns:c="http://www.springframework.org/schema/c"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mongo="http://www.springframework.org/schema/data/mongo"
	xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="
	http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
	http://www.springframework.org/schema/tx
	http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
	http://www.springframework.org/schema/context
	http://www.springframework.org/schema/context/spring-context-3.1.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/util
	http://www.springframework.org/schema/util/spring-util-3.1.xsd">
	<context:property-placeholder properties-ref="deployProperties" />
	<!-- Activate Spring Data MongoDB repository support -->
	<mongo:repositories base-package="org.krams.repository" />
	<!-- Add Replica Set support -->
	<mongo:mongo replica-set="${mongo.replica.set}"/>
	<!-- Template for performing MongoDB operations -->
	<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"
	c:mongo-ref="mongo" c:databaseName="${mongo.db.name}"/>
	<!-- Service for initializing MongoDB with sample data using MongoTemplate -->
	<bean id="initMongoService" class="org.krams.service.InitMongoService" init-method="init"/>
	</beans>

view raw spring-data.xml hosted with ❤ by GitHub

That's all we need to for our Spring application!

Next

In the next section, we will run and test our servers to verify and test our MongoDB cluster for replication. Click here to proceed.