we used to represent the errors in struts by actionerrors.
For every error we wil write one actionerror..like we wil 
write all the errors in actionerror object.

All ActionErrors Ojects are hold by ActionError Object.

Any how it is deprecated in Struts1.1, you wil find 
ActionMessages and ActionMessage objects in struts1.1

ActionErrors is the super class of ActionError.So we have 
to make one ActionError object for every error and add all 
the objects to ActionErrors object.

In Struts, error messages are represented by creating 
an object of type ActionError i.e.,
    
   ActionError ae = new ActionError("errone");
  
   To store multiple ActionError objects we use 
ActionErrors object
   
   ActionErrors aes = new ActinErrors();
    aes.add("one",ae);

An ActionErrors object has request scope.

but ActionError, Jsp page can retrieve the object from the
request and use the ActionError object contained whithin it to
display error messages to the user.