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JDK's Bug?! java.util.Properties don't save comments!

Yashnoo lyo
Ranch Hand

Joined: Feb 17, 2003
Posts: 152
Hi friends:
I want to edit a test.properties file using class java.util.Properties. My file is:



After I run my application,all the comment is lost!
My code is:




After I run my code,the test.properties change to this:


Where is my comments!? They are deleted by java.util.Properties!
All my comments information lost! why Properties class don't save comment? ;-(


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Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14107
    
  16

The specifications of the Properties class and the load(...) and store(...) methods do not say anything about preserving your comments in the file.

This is not a JDK bug - the Properties class was just not designed to save files with comments etc. in exactly the same format as what you typed in by hand.


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Christophe Verré
Sheriff

Joined: Nov 24, 2005
Posts: 14687
    
  16

I agree with Jesper.


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Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 41509
    
  53
If you absolutely need to preserve comments when programmatically modifying properties files, have a look at the UberProperties class.


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