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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
String Vs StringBuffer
We know that String is immutable object. We can not change the value of a String object once it is initiated. If we try to change the value of the existing String object then it creates new object rather than changing the value of the existing object. So incase, we are going to do more modificatios on String, then use StringBuffer. StringBuffer updates the existing objects value, rather creating new object.
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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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