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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What is daemon thread?
Daemon thread is a low priority thread. It runs intermittently in the back ground, and takes care of the garbage collection operation for the java runtime system. By calling setDaemon() method is used to create a daemon thread.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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