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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
What is java static import?
By using static imports, we can import the static members from a class rather than the classes from a given package. For example, Thread class has static sleep method, below example gives an idea:

import static java.lang.Thread;
public class MyStaticImportTest {
public static void main(String[] a) {
try{
sleep(100);
} catch(Exception ex){

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