java.lang.NullPointerException
	at org.gisko.testProperties.getCatalogsFrom(testProperties.java:44)
	at org.gisko.testProperties.<init>(testProperties.java:27)
	at org.gisko.testProperties.main(testProperties.java:32)

package org.gisko;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;

public class testProperties {

	public testProperties() throws Exception{
		
		// Определим файл настроек
		properties = new Properties();
		try{
			properties.load(new FileInputStream(FILE_OF_PROPERTIES));
		}catch(FileNotFoundException e){
			File newFileProperties = new File(FILE_OF_PROPERTIES);
			newFileProperties.createNewFile();
			System.out.println("The settings file is not found. Please change properties in the file: " + newFileProperties.getAbsolutePath());
			System.exit(0);
			
		}
		CATALOGS_FROM = getCatalogsFrom(properties.propertyNames());
	}
	
	public static void main(String[] args){
		try{
			testProperties prop = new testProperties();
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	
	private ArrayList<File> getCatalogsFrom(Enumeration e){
		ArrayList<File> catalogsForExchange = null;
		while(e.hasMoreElements()){
			String key = (String) e.nextElement();
			if(key.substring(0, 7).equalsIgnoreCase("catalog")){
				System.out.println("key = " + key);
				catalogsForExchange.add(new File(properties.getProperty(key)));
			}
		}
		return catalogsForExchange;
	}
	
/*	private ArrayList<File> getCatalogsFrom(Set<String> s){
		ArrayList<File> catalogsForExchange = null;
		
		Iterator iter = s.iterator();
		
		while(iter.hasNext()){
			String key = (String) iter.next();
			System.out.println(key);
			File ff = new File(properties.getProperty(key));
			System.out.println(ff);
			catalogsForExchange.add(ff);
		}
		return catalogsForExchange;
	}
*/
	
	private ArrayList<File> CATALOGS_FROM;
	private Properties properties;
	private static final String FILE_OF_PROPERTIES = "settings.properties";
}

ArrayList<File> catalogsForExchange = null;