API Portarl error (Could not create connection to database server)

Document ID : KB000104912
Last Modified Date : 18/07/2018
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Question:
Catalina.out had ERROR messages related to database server connection.

Snippets from " catalina.out-20180529” attached:

Line 2382: 05/28 09:09:59.413 ERROR (SimpleThreadPoolWorker-4:) - Could not create connection to database server. Attempted reconnect 3 times. Giving up.
Line 2383: 05/28 09:09:59.416 ERROR (SimpleThreadPoolWorker-4:) - [APIListXS general] -- org.hibernate.exception.JDBCConnectionException: Could not open connection
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:67)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:124)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:221)
(suppressed)
Line 2535: 05/28 09:10:24.266 ERROR (http-37080-6:) - Could not create connection to database server. Attempted reconnect 3 times. Giving up.
Environment:
API Developer Portal v3.1 (Software)
Answer:
Since the error only appeared once in the log it is probably safe to ignore. The error indicates that the MySQL server was temporarliy unavailable.