title: What does a part after a colon in a Spring expression indicate?
body: <p>I understand the part of <code>${user.configuredName}</code>, but I can't understand or find on google the part that is after that <code>:ABC</code>. Can anyone please explain what it does?</p>
  <p>What I understand is this that <code>${user.configuredName}</code> will read the property from the properties using <code>messageSource</code>.</p>
  <pre><code> &lt;constructor-arg value=&quot;${user.configuredName:ABC}&quot;/&gt;
  </code></pre>