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How to learn about a new application quickly.

 
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Hi All,

Can any one suggest me how to learn a new application. I have recently changed my project. My new project is completely mess. No documentation nothing. Also a lot of unnecessary code. JAVA code in JSP. But I do not have time to get knowledge transition time. Kindly suggest how should I proceed to learn about such kind of application.
 
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I think this is a common problem, you should first gain functional knowledge about project. Once you have aquired sufficient understanding you can start with code walkthrough. You may start with deployment descriptor for each module.
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