Do i need to compile .java files in Eclipse to run application?

I am creating dynamic web project in Eclipse.

I have the .java files in src folder and other files in WebContent/WEB-INF/lib.

Now normally I click .jsp file and click run on server. Bu开发者_如何学Ct do I also need to compile the .java files in above src folder or does Eclipse do that automatically for me?

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Eclipse should do it automatically.