Mysql connection lost after a certain interval grails application - mysql

Question

I am currently using Grails-2.2.4 on my application, recently I've been facing a strange issue. In my production war, the application is frequently losing mysql connection after some period and the application requires a restart for the connection to work again and it works fine for another couple of days.
I am using tomcat jdbc-pool:7.0.47 and here is my here is my datasource properties
dataSource {
shard = false
pooled = true
driverClassName = "com.mysql.jdbc.Driver"
dbCreate = "update" // one of 'create', 'create-drop','update'
properties {
initialSize=5
maxActive=50
minIdle=5
maxIdle=25
maxWait = 10000
maxAge = 10 * 60000
minEvictableIdleTimeMillis=1800000
timeBetweenEvictionRunsMillis=1800000
numTestsPerEvictionRun=3
validationQuery="SELECT 1"
validationInterval=15000
testWhileIdle=true
testOnBorrow=true
testOnReturn=true
jdbcInterceptors = "ConnectionState"
defaultTransactionIsolation = java.sql.Connection.TRANSACTION_READ_COMMITTED
}
}
I have the same configuration in some other application and it has been running without any problems

Answer 1

Try to add autoreconnect argument in your datasource URL:
dataSource {
url = "jdbc:mysql://localhost:3306/mydb?autoReconnect=true"
}
Update
Another reason could be your TCP firewall is dropping the connection after some time being idle. So you need to modify the TCP timeout settings. I'm giving an related doc for how to achieve this on Amazon EC2 http://docs.aws.amazon.com/redshift/latest/mgmt/connecting-firewall-guidance.html. You can do it for your provider, that should be same.