Мы используем несколько источников данных Spring для соединения нескольких баз данных. Мы получаем следующие ошибки только изредка, а затем через некоторое время все снова начинает работать автоматически
o.h.e.j.s.SqlExceptionHelper.logExceptions:129 - SQL Error: 0, SQLState: null
org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is org.hibernate.TransactionException: JDBC begin transaction failed:
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 84,250,518 milliseconds ago. The last packet sent successfully to the server was 84,250,518 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.