I am using PropertiesConfiguration to edit property file. This allows me to retain comments.

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Asked: May 23, 20262026-05-23T23:19:11+00:00 2026-05-23T23:19:11+00:00

I am using PropertiesConfiguration to edit property file. This allows me to retain comments.

0

I am using PropertiesConfiguration to edit property file. This allows me to retain comments. All works fine except for comments that comes after the last key..

For example input file

# *** A comment
GameCheck.no=No
**#  end coment**

The output is as below. It lost comment that was after last key

# *** A comment
GameCheck.no = myvar

The code as below.

package trials;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.configuration.PropertiesConfigurationLayout;

import java.io.FileWriter;
import java.io.IOException;

public class EditVersion {

    public static void main(String[] args) {

        try {
            PropertiesConfiguration config =  new PropertiesConfiguration("C:\\try\\in.properties");
            config.setProperty("application.version", "myvar");
            PropertiesConfigurationLayout layout = config.getLayout();

            config.save( new FileWriter( "c:/try/out.props"));
        } catch (ConfigurationException e) {

        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }
    }
}

Work around is to add a dummy property towards the end of file. Is there a correct way?