Tomcat8.0.53 & Java related issues

[zhuyix...@orientalmind.com]

Dear Sir or Madam:
    Howdy.I'm a Java developer.I am learning related knowledge of 
Tomcat.Version for 8.0.53.
    At present,I have some problems and I hope I can get help.
    Currently I'm using the 
org.apache.catalina.util.RequestUtil.parseParameters().
    I found this method deprecated after version 8.5.xx.I can't find in the 
notes or documentation why it was abandoned and what is the recommended 
alternative.
    I hope you can answer it for me at your convenience. 
    Thank you