title: HikariPool-1 – Connection is not available, request timed out after 30000ms
body: <p>I am using the standard HikariCP implementation in my SpringBoot 2.0.1 application. But after a while I get the same error over and over</p>
  
  <blockquote>
    <p>HikariPool-1 – Connection is not available, request timed out after 30000ms</p>
  </blockquote>
  
  <p>I first checked the code if there are any not closed connection or missing Transactional annotations but I did not find anything. I also tried then to increase the pool and decrease the time out in my application.yml but it seems that this does not have any effect.</p>
  
  <p>The weird thing is that HikariCP seems to create only 4 pooled connection and I am not able to override these properties.</p>
  
  <p>HikariPool-1 - Timeout failure stats (total=4, active=4, idle=0, waiting=100)</p>
  
  <p>This is my <code>application.yml</code> file</p>
  
  <pre><code>spring:
    jpa:
      hibernate:
        ddl-auto: update
    datasource:
        hikari:
          maximum-pool-size: 64
          connection-timeout: 5000
  </code></pre>