Stores the portlet preferences to a persistent storage. This method
should only be invoked within processAction() method.
See Also:PortletPreferencesImpl.internalStore() throws: IllegalStateException - if this method is not invoked withinprocessAction() method. throws: ValidatorException - if the portlet preferences are not valid. throws: IOException - if an error occurs with the persistence mechanism.
Returns the string representation of this object. Preferences are
separated by ';' character, while values in one preference are separated
by ',' character.
the string representation of this object. See Also:java.lang.Object.toString