How to Solve java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener in Spring? [Example]

If you have worked in Spring MVC then you may be familiar with  
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener, 
which is common problem during deployment. Spring MVC throws  java.lang.ClassNotFoundException:                           org.springframework.web.context.ContextLoaderListener ,
when its not able to find org.springframework.web.context.ContextLoaderListener class which is used to load spring MVC configuration files like application-context.xml and other Spring Framework configuration files defined in context-param element of web.xml in an Spring MVC web application as:
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Why use Underscore in Numbers from Java? Underscore in Numeric Literals Example

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