Failed operation exception while trying to fetch object from database

Question

I am trying to fetch two objects A,B from database where the two objects will have many levels Under A, there will be so many objects

 A -> C -> D -> E -> F .... B -> G -> H ... 

i am able to fetch object B and its subobjects properly but when i am trying to fetch object A and its sub objects,its throwing the following exception

 abc.sa.model.error:FailedOperationException:Get Object Failed:Database read failure:org.hibernate.exception..GenericJDBCException:Cannot open connection 

While trying to fetch object B, if i attach debugger and go step by step,i am experiencing the same error Hence i assume that it might be because of some time out exception

Answer 1

It's not happening because your particular object is not able to load, it's because you are not able to connect to your database and yes might it be a timeout problem. To overcome it check if all the points mentioned below are as expected:

1. Database should not be down.
2. The Application Server should reach Database.
3. Your username and password that you used for your database is correct.
4. There are enough JDBC connections available to connect to your database.