After almost 1 day hibernate says: could not execute Query

After almost 1 day hibernate says: could not execute Query


Did you read this? 
http://dev.mysql.com/doc/connector/j/en/cj-faq.html#id2787172 

MySQL closes connections after 8 hours of inactivity. 
And even if you set the autoreconnect=true, you should be catching 
SQLExceptions in your application and dealing with them. 

But you also need to becareful for using autoReconnect function, 
because autoReconnect will be depcreated in the future. 

For detail, see the Mark Matthews comment of this. 
http://bugs.mysql.com/bug.php?id=5020