code: public Boolean getBoolean(String key)
     {
        Boolean bVal = null;
        String sVal = getText(key);
        if ((sVal != null) && (sVal.length() > 0))
        {
           bVal =  Boolean.valueOf(sVal);
        }
        return bVal;
     }
docs: Get a Setting property as a Boolean object.
  
  @param key the key name of the numeric property to be returned.
  
  @return Value of the property as an Boolean or null if no property found.
  Note that the value of the returned Boolean will be
  false if the <p/>property sought after exists but is not equal to
  "true" (ignoring case).