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com.opensymphony.xwork2
public interface: Action [javadoc | source]

All Known Implementing Classes:
    ActionSupport

All actions may implement this interface, which exposes the execute() method.

However, as of XWork 1.1, this is not required and is only here to assist users. You are free to create POJOs that honor the same contract defined by this interface without actually implementing the interface.
Field Summary
public static final  String SUCCESS    The action execution was successful. Show result view to the end user. 
public static final  String NONE    The action execution was successful but do not show a view. This is useful for actions that are handling the view in another fashion like redirect. 
public static final  String ERROR    The action execution was a failure. Show an error view, possibly asking the user to retry entering data. 
public static final  String INPUT    The action execution require more input in order to succeed. This result is typically used if a form handling action has been executed so as to provide defaults for a form. The form associated with the handler should be shown to the end user.

This result is also used if the given input params are invalid, meaning the user should try providing input again. 

public static final  String LOGIN    The action could not execute, since the user most was not logged in. The login view should be shown. 
Method from com.opensymphony.xwork2.Action Summary:
execute
Method from com.opensymphony.xwork2.Action Detail:
 public String execute() throws Exception
    Where the logic of the action is executed.