Title: ActionError() problem

Hi,
How can I use ActionError() to construct the error message that is not define in the message property file? Who can give me a example. I want display a dynamic error message such as "ith line got some error !".

Who can give me a explanation about second parameter for following ActionError method

public ActionError(java.lang.String key,
                   java.lang.Object value0)

    Construct an action error with the specified replacement values.

Parameters:

    key - Message key for this error message
    value0 - First replacement value
    Thanks in advance!
    Gang

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