JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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ClassNotFoundException: org.springframework.web.context.ContextLoaderListener


If you ever want to access the Servlet context during startup of your web application spring provides a ContextLoaderListener, that can easily be plugged into web.xml

Some of the most common use cases of ContextLoaderListener are:

1) During startup of the web application, if I want to load some static or configuration data from database and keep in the memory.
2) During startup and before destroy of my web application, If I want to get notify.
3) If I want to have a programatic configuration of spring, instead of from static context file.

You must configure the listner in your web.xml as shown below:

	<listener>
		<listener-class>
        	org.springframework.web.context.ContextLoaderListener
		</listener-class>
	</listener>

And make sure that you have included spring-web.jar dependency in your pom.xml file as shown below:

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>3.2.0.RELEASE</version>
		</dependency>

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Knowledge Centre
What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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