There is no action mapped for namespace [/] and Action name [runaction] associated with context path [/STRUTS2_DAY01].

Write a struts2 project, after importing the jar package to run normally, when I create another action class, go to Error:

There is no action mapped for namespace [/] and Action name [runaction] associated with context path [/STRUTS2_DAY01].

Online for a long time, said Struts.xml file name, the path is not correct, but my project can run for the first time, that is not the problem, and then carefully check the new action class and the corresponding configuration, there is no problem. Then I think is not, I modified but Tomcat did not change, and then emptied the program, click Project-clean, and then run, succeeded.

There is no action mapped for namespace [/] and Action name [runaction] associated with context path [/STRUTS2_DAY01].