code: public String getProperty(String key, String defaultValue) {
  		return props.getProperty(prefix + key, defaultValue);
  	}
docs: Returns the value of a property, or the default value if no value is
  defined
  
  @param key
  the key of the property
  @param defaultValue
  the default value
  @return the value of a property, or the default value if no value is
  defined