<p>Note that the toString() method on this class and subclasses
 calls the <code>write</code> method,
 which may have undesirable side effects.
The request and response objects are set to null,
 and these objects are often necessary for the proper functioning
 of the subsequest <code>write</code> method.
Actions on the ActionProvider will not work.
Debuggers often use toString() to show the value of a variable,
 and this may cause unexpected behavior while debugging</p>
