About the error message output to ssgLog

Document ID : KB000072551
Last Modified Date : 31/08/2018
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The following errors are output to log.

WARNING 381 org.hibernate.util.JDBCExceptionReporter: SQL Error: 0, SQLState: 08003 
SEVERE 381 org.hibernate.util.JDBCExceptionReporter: No operations allowed after statement closed. 
SEVERE 381 org.hibernate.transaction.JDBCTransaction: JDBC rollback failed 
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.....

Current, it seeme it is no problem in API Gateway.
However, the error is "SEVERE".
So, there may be something pronlems.

What does the above error mean?
If that is a problem, what is the solution?
API Gatewaty
That means it failed to connect with the DB.

If the error is temporary it will not be a problem.
When the error occurred, connection to the DB failed for some reason. 
But current  Gateway  can connect with the DB without problems.

If the errors are occurring frequently it is a problem.
Please contact CA support.