title: Spring boot "Hikari Pool Shutdown" early error
body: <p><strong>ERROR:</strong></p>
  
  <pre><code>2018-11-12 18:25:31.221  INFO 3028 --- [       Thread-3] 
  com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown initiated...
  
  2018-11-12 18:25:31.223  INFO 3028 --- [       Thread-3] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown completed.
  </code></pre>
  
  <p>Why does this error occur?</p>
  
  <p>And how can I solve?</p>