Spring mongodb connection failure

[Mihir Naik]

I am working on spring mongodb application [Environment: jdk 1.7, tomcat7 and CentOs system, Framework: spring 3.x, mongo-2.10],
We used `mongotemplate` to interface with mongo instance.
Initially application works fine but over a period of time we are experiencing mongodb connection failure problem.

We have tried to resolve the issue by changing mongo properties, also made changes related to tcp-keep-alive and networking settings
but still facing the same problem. After getting an error we checked mongo service it was running. Now we have to restart the tomcat to make the application working.

Application Configurations

<context:property-placeholder location="classpath:mongo.properties"
		ignore-unresolvable="true" />

	<mongo:mongo  id="mongoBean" host="${mongo.host.name}" port="${mongo.host.port}">
              <mongo:options
              connections-per-host="${mongo.connectionsPerHost}"
              threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"
              connect-timeout="${mongo.connectTimeout}"
              max-wait-time="${mongo.maxWaitTime}"
              auto-connect-retry="${mongo.autoConnectRetry}"
              socket-keep-alive="${mongo.socketKeepAlive}"
              socket-timeout="${mongo.socketTimeout}"
              slave-ok="${mongo.slaveOk}"
              write-number="${mongo.writeNumber}"
              write-timeout="${mongo.writeTimeout}"
              write-fsync="${mongo.writeFsync}"/>
     </mongo:mongo>

	<bean id="mongoCredentials" class="org.springframework.data.authentication.UserCredentials">
		<constructor-arg name="username" value="${mongo.db.username}" />
		<constructor-arg name="password" value="${mongo.db.password}" />
	</bean>

	<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
		<property name="writeResultChecking" value="EXCEPTION" />
		<property name="writeConcern" value="FSYNC_SAFE" />
		<constructor-arg ref="mongoBean" />
		<constructor-arg name="databaseName" value="${mongo.db.name}" />
		<constructor-arg name="userCredentials" ref="mongoCredentials" />
	</bean>

Mongo.properties:

    mongo.db.name=pat_queue
    mongo.host.name=localhost
    mongo.host.port=27017
    mongo.connectionsPerHost=40
    mongo.threadsAllowedToBlockForConnectionMultiplier=1500
    mongo.connectTimeout=30000
    mongo.maxWaitTime=15000
    mongo.autoConnectRetry=true
    mongo.socketKeepAlive=true
    mongo.socketTimeout=60000
    mongo.slaveOk=true
    mongo.writeNumber=1
    mongo.writeTimeout=0
    mongo.writeFsync=true
    mongo.globalcollection.name = gnx_glbdrgx_mt
    mongo.db.username = 
    mongo.db.password =

Exception

org.springframework.dao.DataAccessResourceFailureException: can't call something : localhost/127.0.0.1:27017/pat_queue; nested exception is com.mongodb.MongoException$Network: can't call something : localhost/127.0.0.1:27017/pat_queue at org.springframework.data.mongodb.core.MongoExceptionTranslator.translateExceptionIfPossible(MongoExceptionTranslator.java:56) at org.springframework.data.mongodb.core.MongoTemplate.potentiallyConvertRuntimeException(MongoTemplate.java:1551) at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:1462) at org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:1260) at org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:1249) at