/*
 * Copyright 2012-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.boot.autoconfigure.mongo;

import java.net.UnknownHostException;

import javax.annotation.PreDestroy;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.mongodb.Mongo;
import com.mongodb.MongoClientOptions;

/**
 * {@link EnableAutoConfiguration Auto-configuration} for Mongo.
 *
 * @author Dave Syer
 * @author Oliver Gierke
 * @author Phillip Webb
 */
@Configuration
@ConditionalOnClass(Mongo.class)
@EnableConfigurationProperties(MongoProperties.class)
public class MongoAutoConfiguration {

	@Autowired
	private MongoProperties properties;

	@Autowired(required = false)
	private MongoClientOptions options;

	private Mongo mongo;

	@PreDestroy
	public void close() {
		if (this.mongo != null) {
			this.mongo.close();
		}
	}

	@Bean
	@ConditionalOnMissingBean
	public Mongo mongo() throws UnknownHostException {
		this.mongo = this.properties.createMongoClient(this.options);
		return this.mongo;
	}

}

/*
 * Copyright 2012-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.boot.autoconfigure.mongo;

import java.net.UnknownHostException;

import javax.annotation.PreDestroy;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.MongoDbFactory;

import com.mongodb.Mongo;
import com.mongodb.MongoClientOptions;

/**
 * {@link EnableAutoConfiguration Auto-configuration} for Mongo.
 *
 * @author Dave Syer
 * @author Oliver Gierke
 * @author Phillip Webb
 */
@Configuration
@ConditionalOnClass(Mongo.class)
@EnableConfigurationProperties(MongoProperties.class)
@ConditionalOnMissingBean(MongoDbFactory.class)
public class MongoAutoConfiguration {

	@Autowired
	private MongoProperties properties;

	@Autowired(required = false)
	private MongoClientOptions options;

	private Mongo mongo;

	@PreDestroy
	public void close() {
		if (this.mongo != null) {
			this.mongo.close();
		}
	}

	@Bean
	@ConditionalOnMissingBean
	public Mongo mongo() throws UnknownHostException {
		this.mongo = this.properties.createMongoClient(this.options);
		return this.mongo;
	}

}

Add @ConditionalOnMissingBean(MongoDbFactory)