title: Possibly consider using a shorter maxLifetime value - hikari connection pool spring boot
body: <p>After starting my SpringBoot application, getting an exception on few minutes of the server startup. Did not use any HikariPool Configuration externally, Spring Boot is using HikariPool by default
  This is the error I am getting in the console:</p>
  
  <pre><code>2020-02-20 03:16:23 - HikariPool-4 - Failed to validate connection 
  com.mysql.cj.jdbc.ConnectionImpl@4c4180c8 (No operations allowed after connection closed.). 
  Possibly consider using a shorter maxLifetime value.
  2020-02-20 03:16:28 - HikariPool-4 - Failed to validate connection 
  com.mysql.cj.jdbc.ConnectionImpl@679c2f50 (No operations allowed after connection closed.). 
  Possibly consider using a shorter maxLifetime value.
  2020-02-20 03:16:33 - HikariPool-4 - Failed to validate connection 
  com.mysql.cj.jdbc.ConnectionImpl@16083061 (No operations allowed after connection closed.). 
  Possibly consider using a shorter maxLifetime value.
  2020-02-20 03:16:38 - HikariPool-4 - Failed to validate connection 
  com.mysql.cj.jdbc.ConnectionImpl@4fcaf421 (No operations allowed after connection closed.). 
  Possibly consider using a shorter maxLifetime value.
  2020-02-20 03:16:43 - HikariPool-4 - Failed to validate connection 
  com.mysql.cj.jdbc.ConnectionImpl@33df5d54 (No operations allowed after connection closed.). 
  Possibly consider using a shorter maxLifetime value.
  2020-02-20 03:16:48 - HikariPool-4 - Failed to validate connection 
  com.mysql.cj.jdbc.ConnectionImpl@373d288c (No operations allowed after connection closed.). 
  Possibly consider using a shorter maxLifetime value.
  2020-02-20 03:16:48 - SQL Error: 0, SQLState: 08003
  2020-02-20 03:16:48 - HikariPool-4 - Connection is not available, request timed out after 
  30156ms.
  2020-02-20 03:16:48 - No operations allowed after connection closed.
  2020-02-20 03:16:48 - Servlet.service() for servlet [dispatcherServlet] in context with path 
  [] threw exception [Request processing failed; nested exception is 
  org.springframework.dao.DataAccessResourceFailureException: Unable to acquire JDBC 
  Connection; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to 
  acquire JDBC Connection] with root cause
  </code></pre>