JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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servlet-api-2.5.jar - jar not loaded - tomcat error


This is a common error you will see when you deploy your war file in tomcat.

Aug 13, 2013 6:15:26 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(E:\apache-tomcat-7.0.53\webapps\test\WEB-INF\lib\servlet-api-2.5.jar) 
- jar not loaded. 
See Servlet Spec 3.0, section 10.7.2. Offending class: javax/servlet/Servlet.class

This error is occured because tomcat by default comes with servlet-api.jar file. Now your application also providing servlet-api.jar file. There is a conflict for tomcat to pick the servlet-api.jar. The solution is very simple for this problem. In your maven dependencies, you have specified servlet-api jar file. When maven bundles the war file, it includes all dependent jar files. You configure your maven dependencies such a way that exclude this jar file during creation of war file. How can we exclude a jar file? Possibly, this is how your dependency declaration in pom.xml file

<dependency>
		<groupId>javax.servlet</groupId>
		<artifactId>servlet-api</artifactId>
		<version>2.5</version>
	</dependency>

Now add scope as provided to the above dependency. Which will include the jar till compilation only.

<dependency>
		<groupId>javax.servlet</groupId>
		<artifactId>servlet-api</artifactId>
		<version>2.5</version>
		<scope>provided</scope>
	</dependency>

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Knowledge Centre
Domain Naming Service(DNS)
It is very difficult to remember a set of numbers (IP address) to connect to the Internet. The Domain Naming Service(DNS) is used to overcome this problem. It maps one particular IP address to a string of characters. For example, www.java2novice.com implies com is the domain name reserved for US commercial sites, java2novice is the name of the company and www is the name of the specific computer, which is java2novice's server.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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