AppConfig.java

package org.springframework.data.mongodb.examples.hello;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
import org.springframework.data.mongodb.core.MongoFactoryBean;
import org.springframework.data.mongodb.core.MongoOperations;
import org.springframework.data.mongodb.core.MongoTemplate;

import com.mongodb.Mongo;

@Configuration
public class AppConfig {

	public @Bean MongoOperations mongoTemplate(Mongo mongo) {
		MongoTemplate mongoTemplate = new MongoTemplate(mongo, "test");
		return mongoTemplate;
	}

	/*
	 * Factory bean that creates the Mongo instance
	 */
	public @Bean MongoFactoryBean mongo() {
		MongoFactoryBean mongo = new MongoFactoryBean();
		mongo.setHost("localhost");
		return mongo;
	}

	/*
	 * Use this post processor to translate any MongoExceptions thrown in @Repository annotated classes
	 */
	public @Bean PersistenceExceptionTranslationPostProcessor persistenceExceptionTranslationPostProcessor() {
		return new PersistenceExceptionTranslationPostProcessor();
	}

}