<mongo:db-factory host="${mongo.host}" port="${mongo.port}"
                  dbname="${mongo.dbname}" username="${mongo.user}" password="${mongo.pass}"/>

<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
    <constructor-arg name="mongoDbFactory" ref="mongoDbFactory"/>
</bean>

2016-06-12T17:48:14.475927+00:00 app[web.1]: Caused by: org.springframework.data.mongodb.CannotGetMongoDbConnectionException: Failed to authenticate to database [heroku_x2xxx5xx], username = [heroku_m2rzs5nh], password = [6************************a]
2016-06-12T17:48:14.475914+00:00 app[web.1]:    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
2016-06-12T17:48:14.475919+00:00 app[web.1]:    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
2016-06-12T17:48:14.450178+00:00 app[web.1]:    ... 23 more
2016-06-12T17:48:14.475910+00:00 app[web.1]:    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:407)