Different ways to configure spring data in xml conf:

<!-- Spring data mongo conf using factory -->
<mongo:mongo id="mongo" replica-set="${mongo.database.url}" />

<mongo:db-factory id="mongoDbFactory"
                  mongo-ref="mongo"
                  dbname="${mongo.database.name}"
                  username="${mongo.database.username}"
                  password="${mongo.database.password}"/>

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

<!-- Spring data mongo conf without factory -->
<mongo:mongo id="mongo" replica-set="${mongo.database.url}" />
<bean id="userCredentials" class="org.springframework.data.authentication.UserCredentials">
  <constructor-arg name="username" value="${mongo.database.username}"/>
  <constructor-arg name="password" value="${mongo.database.password}"/>
</bean>

<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
  <constructor-arg name="mongo" ref="mongo"/>
  <constructor-arg name="databaseName" value="${mongo.database.name}"/>
  <constructor-arg name="userCredentials" ref="userCredentials"/>
</bean>