title: Variables in property files in spring boot
body: <p>Can I use a propertie inside a application.properties?</p>
  
  <p>sample:</p>
  
  <pre><code>myLevel=ERROR
  
  logging.level.org.springframework=$myLevel
  logging.level.org.apache.catalina=$myLevel
  </code></pre>
  
  <p>tks</p>