How to read properties in WSO2 BPS/WSO2 BPMN

public class ConfigApp implements JavaDelegate{     

      private static final Logger LOGGER = Logger.getLogger(ConfigApp.class.getName());
      HashMap<String, String> properties = new HashMap<String, String>();          

      @SuppressWarnings("rawtypes")
      public void execute(DelegateExecution execution) throws Exception {
           
            LOGGER.info("Config File Service Task");
            ConfigFile file = new ConfigFile();           

            this.properties = file.getProperties();                                                 

            Iterator entries = this.properties.entrySet().iterator();
            while (entries.hasNext()) {
                  HashMap.Entry entry = (HashMap.Entry) entries.next();
                String key = entry.getKey().toString();
                String value = entry.getValue().toString();                                  

                execution.setVariable(key, value);
            } 
       

      }
}

public class ConfigFile { 

    private static Logger log = Logger.getLogger(ConfigFile.class.getName());
 
    HashMap<String, String> properties = new HashMap<String, String>();

     public ConfigFile() {
        this.readProperties();
    }

     public void readProperties(){

         Properties prop = new Properties();
        InputStream input = null; 

        try {
            Path currentRelativePath = Paths.get("");
            String absolutePath = currentRelativePath.toAbsolutePath().toString();
            log.info("Current relative path is: " + absolutePath);           

             input = new FileInputStream(absolutePath+"https://j8a3m7f3.rocketcdn.me/conf/myconfig.properties");

             // load a properties file
            prop.load(input); 

            Enumeration<?> e = prop.propertyNames();
            while (e.hasMoreElements()) {
                String key = (String) e.nextElement();
                String value = prop.getProperty(key);
                properties.put(key, value);
            }

         } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            if (input != null) {
                try {
                    input.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

     }

    public HashMap<String, String> getProperties(){
       return this.properties;
    }

 }