How to Write Multiple Line Property Value Using Propertiesconfiguration

Properties File multi-line values using PropertiesConfiguration

I created a work around in case anyone else needs this functionality. Also, there is probably a better way to do this, but this solution currently works for me.

First, set your PropertiesConfiguration delimiter to the new line character like so:

PropertiesConfiguration config = new PropertiesConfiguration(configFile);
config.setListDelimiter('\n');

Then you will need to iterate through and update all properties (to set the format):

Iterator<String> keys = config.getKeys();
    while (keys.hasNext()) {
        String key = keys.next();

        config.setProperty(key,setPropertyFormatter(key, config.getProperty(key))) ;

    }

use this method to format your value list data (as shown above):

private List<String> setPropertyFormatter(String key, Object list) {
    List<String> tempProperties = new ArrayList<>();
    Iterator<?> propertyIterator = PropertyConverter.toIterator(list, '\n');;
    String indent = new String(new char[key.length() + 1]).replace('\0', ' ');

    Boolean firstIteration = true;
    while (propertyIterator.hasNext()) {
        String value = propertyIterator.next().toString();

        Boolean lastIteration = !propertyIterator.hasNext();

        if(firstIteration && lastIteration) {
            tempProperties.add(value);
            continue;
        }

        if(firstIteration) {
            tempProperties.add(value + ",\\");
            firstIteration = false;
            continue;
        }

        if (lastIteration) { 
            tempProperties.add(indent + value);
            continue;
        } 

        tempProperties.add(indent + value + ",\\");
    }



    return tempProperties;
}

Then it is going to be almost correct, except the save function takes the double backslash that is stored in the List, and turns it into 4 back slashes in the file! So you need to replace those with a single backslash. I did this like so:

try {
        config.save(new File(filePath));


        byte[] readIn = Files.readAllBytes(Paths.get(filePath));
        String replacer = new String(readIn, StandardCharsets.UTF_8).replace("\\\\\\\\", "\\");

        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath, false), "UTF-8"));
        bw.write(replacer);
        bw.close();

} catch (ConfigurationException | IOException e) {
        e.printStackTrace();
}

apache-commons-config PropertiesConfiguration: comments after last property is lost

This is a bug that should be reported in the project's JIRA :)

https://issues.apache.org/jira/browse/CONFIGURATION

Can I put comments in between or after multiline properties in a Java Properties file?

Unfortunately, it's not possible as Java properties files can have only single line # comments.

However, you might be aware that you can also define properties in xml format and the XML syntax will let you enter multi-line comments.

If you decide to give XML a chance then you will need to call Properties#loadFromXML(InputStream) to load your XML property file.

Multiple values in java.util.Properties

Try:

foo=1,2

String[] foos = properties.getProperty("foo").split(",");

Write multi-line string in Spring boot .conf file

Spring boot launch script will use the shell to source the .conf file, so you can put any shell script syntax to write the configuration. I would prefer to use vars to format them in your case such as the following:

MEM_OPTS='-Xms256m -Xmx512m'
DISPLAY_NAME='visualvm.display.name=ApplicationWs'
JMXREMOTE_PORT='com.sun.management.jmxremote.port=3333'
JMXREMOTE_SSL='com.sun.management.jmxremote.ssl=false'
JMXREMOTE_AUTH='com.sun.management.jmxremote.authenticate=false'

JAVA_OPTS="${MEM_OPTS} -D${DISPLAY_NAME} -D${JMXREMOTE_PORT} -D${JMXREMOTE_SSL} -D${JMXREMOTE_AUTH}"

see here

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