tomcat fail to update newly compiled java files

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Java

JSP

I am using tomcat 6 web server to do some jsp stuff.

If I made some changes to an associated **java** file and compile it, tomcat fail to reflect such changes.(if those changes are made to **jsp** file, it is ok)

However, if I restart the tomcat server, the changes are reflected and everything goes as I expect.

I doubt it is the server cache thing. How can I solve it?