struts2 run one hour after the ClassNotFoundException

tomcat6 struts2.3.8 spring3.2.1
There is a action, restart tomcat after about an hour there will be ClassNotFoundException, other action are no problem.
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in the end is how is it
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you the scope of this action is not set up as a prototype up ?
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another try, or else be sure it is a problem in your code , actually wrong , it must be a problem in your code . May be a hidden problem such as thread , io needs that require a long time to find the
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you look at the class file exists Caesar