com.opensymphony.xwork2

## Interface UnknownHandler

-     public interface UnknownHandler

  Handles cases when the result or action is unknown.

  This allows other classes like Struts plugins to provide intelligent defaults easier.

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `ActionConfig` | `handleUnknownAction(String namespace, String actionName)` Handles the case when an action configuration is unknown.
    `Object` | `handleUnknownActionMethod(Object action, String methodName)` Handles the case when an action method cannot be found.
    `Result` | `handleUnknownResult(ActionContext actionContext, String actionName, ActionConfig actionConfig, String resultCode)` Handles the case when a result cannot be found for an action and result code.

- - ### Method Detail

    - #### handleUnknownAction

          ActionConfig handleUnknownAction(String namespace,
                                         String actionName)
                                           throws XWorkException

      Handles the case when an action configuration is unknown. Implementations can return a new ActionConfig to be used to process the request.
      Parameters:
        `namespace` - The namespace
        `actionName` - The action name
      Returns:
        An generated ActionConfig, can return `null`
      Throws:
        `XWorkException` - in case of errors

    - #### handleUnknownResult

          Result handleUnknownResult(ActionContext actionContext,
                                   String actionName,
                                   ActionConfig actionConfig,
                                   String resultCode)
                                     throws XWorkException

      Handles the case when a result cannot be found for an action and result code.
      Parameters:
        `actionContext` - The action context
        `actionName` - The action name
        `actionConfig` - The action config
        `resultCode` - The returned result code
      Returns:
        A result to be executed, can return `null`
      Throws:
        `XWorkException` - in case of errors

    - #### handleUnknownActionMethod

          Object handleUnknownActionMethod(Object action,
                                         String methodName)

      Handles the case when an action method cannot be found. This method is responsible both for finding the method and executing it.
      Parameters:
        `action` - The action object
        `methodName` - The method name to call
      Returns:
        The result returned from invoking the action method, can return `null` if this instance cannot handle such methodName to allow other handlers give a chance
      Since:
        2.1

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