title: Apache Config setProperty Method is it write in memory or is it rewrite old configuration?
body: <p>This about the java dependencies named Apache Configuration. 
  what does setProperty() do, is it would write in memory or it would rewrite the old configuration value on the file. </p>
  
  <p>im already reading the file on <a href="https://commons.apache.org/proper/commons-configuration/apidocs/org/apache/commons/configuration2/Configuration.html#setProperty(java.lang.String,%20java.lang.Object)" rel="nofollow">here</a> cannot get the details. </p>
  
  <p>Thanks for any suggestion</p>