About the error message output to ssgLog

Document ID : KB000072551
Last Modified Date : 31/08/2018
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Question:
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.

Question:
What does the above error mean?
If that is a problem, what is the solution?
 
Environment:
API Gatewaty
Answer:
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.