title: Spring boot app error log says attempt to configure ONS in FanManager failed with oracle.ons.NoServersAvailable
body: <p>I am running a Spring Boot application (<code>v2.2.0-RELEASE</code>) with <code>spring-boot-starter-jdbc</code> and <code>com.oracle.ojdbc:ojdbc8:19.3.0.0</code> driver. </p>
  
  <p>When I try to query the database using <code>JdbcTemplate</code> I see the following error in the console log:</p>
  
  <pre><code>2019-11-15 14:07:51.154 ERROR 23436 --- [main] oracle.simplefan.FanManager: attempt to configure ONS in FanManager failed with oracle.ons.NoServersAvailable: Subscription time out
  </code></pre>
  
  <p>I have no clue why I'm seeing this error even though the database connection is successful and query result is correct. </p>
  
  <p>Is there any way to get rid of this error or just ignore?</p>