Alex Rivera | Logout

Error: Servlet Jar not Loaded... Offending class: javax/servlet/Servlet.class

Asked 2010-01-03T00:42:34.177
32

I get the following error:

INFO: validateJarFile(C:\dev\server\tomcat6\webapps Sempedia\WEB-INF\lib\servlet-api.jar) - jar not loaded. See Servlet Spec 2.3, sectoin 9.7.2. Offending class: javax/servlet/Servlet.class

The existing resources out there say it is due to a conflict with the servlet.jar or in my case named servlet-api.jar file. I have removed all other projects from the /webapps folder, I have taken the servlet-api.jar file that was in the tomcat6/lib directory and added that and only that to the project build path, so I can't see how there is still a conflict.

When I try to run the application I get the following stack trace.

org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 22 in the generated java file The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory

Stacktrace:

org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92) org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330) org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439) org.apache.jasper.compiler.Compiler.compile(Compiler.java:334) org.apache.jasper.compiler.Compiler.compile(Compiler.java:312) org.apache.jasper.compiler.Compiler.compile(Compiler.java:299) org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267) javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

java tomcat dependencies
Edit
Report

2 Answers

20

As other answers say, this is because your WAR includes the servlet API classes, but it should not do so.

If you are using Maven to build your project you will want to tell Maven to make the servlet API available when compiling and testing, but not to include it in the WAR. As the Maven documentation about dependency scope says, you should use provided scope for the Servlet API:

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

You might also have to explicitly exclude the Servlet API as a transitive dependency, if some of your dependencies pull in the Servlet API as a compile dependency:

    <dependency>
        <groupId>com.example</groupId>
        <artifactId>frob-driver-core</artifactId>
        <version>1.0.1</version>
        <exclusions>
            <exclusion>
                <artifactId>servlet-api</artifactId>
                <groupId>javax.servlet</groupId>
            </exclusion>
        </exclusions>
    </dependency>
answered 2013-07-19T11:40:14.847
4

You are not allowed to deploy classes that override those defined in the Servlet Specification to be provided by the web container. You can download the specification from

http://www.jcp.org/aboutJava/communityprocess/final/jsr053/

and check for yourself. Section 9.7.2 is on physical page 63.

Servlet 2.3 is a rather old version indicating an ancient version of Tomcat. Is there any particular reason you are not using a newer one?

answered 2010-01-03T05:40:46.143

Your Answer