Load Properties dynamically

Use Apache Commons Configuration and you can re-load property file dynamically.

Here is the complete code snippet for you

Java Code

import java.util.Arrays;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.configuration.reloading.FileChangedReloadingStrategy;

public class ApacheCommonsTest {

private static final String PROPERTIES_FILE_NAME = "C:\\sampleconfig\\reloadconfig.properties"; // you can use your own folder for this

/**
* @param args
*/
public static void main(String[] args) {
ApacheCommonsTest classObj = new ApacheCommonsTest();
try {
classObj.getBackground();
classObj.getPieColors();
} catch (ConfigurationException e) {
e.printStackTrace();
}
}

private PropertiesConfiguration getPropertyConfig()
throws ConfigurationException {
PropertiesConfiguration config = null;
config = new PropertiesConfiguration(PROPERTIES_FILE_NAME);
config.setReloadingStrategy(new FileChangedReloadingStrategy());
config.setAutoSave(true);
return config;
}

private void readProperties() throws ConfigurationException {
PropertiesConfiguration config = getPropertyConfig();
config.load(PROPERTIES_FILE_NAME);
}

private void getPieColors() throws ConfigurationException {
readProperties();
String[] piecolors = getPropertyConfig().getStringArray("colors.pie");
System.out.println("colors.pie=" + Arrays.toString(piecolors));
}

private void getBackground() throws ConfigurationException {
readProperties();
String bgcolor = getPropertyConfig().getString("colors.background");
System.out.println("bgcolor=" + bgcolor);
}
}

Sample Property file
C:\\sampleconfig\\reloadconfig.properties


colors.pie=#FF0000,#00FF00,#0000FF,#123456
colors.background=#c53478


Jar files to run this program

You can get all the jar files from findjar.com

1. commons-configuration-1.9.jar
2. commons-lang-2.2.jar
3. commons-logging-1.1.1.jar

Now no more reloading with server re-start