java - What does offending class tell me on server startup?

Question

I'm having the jee7 web api as dependency. I can start my app on tomcat application successfully, but what does the following "offending class" statements tell me? Do I have to take any actions?

Jan 13, 2014 5:47:47 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
Information: validateJarFile(C:UsersmeServersapache-tomcat-7.0.50wtpwebappsappWEB-INFlibel-api-2.2.jar) - jar not loaded. See Servlet Spec 3.0, section 10.7.2. Offending class: javax/el/Expression.class
Jan 13, 2014 5:47:47 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
Information: validateJarFile(C:UsersmeServersapache-tomcat-7.0.50wtpwebappsappWEB-INFlibjavaee-web-api-7.0.jar) - jar not loaded. See Servlet Spec 3.0, section 10.7.2. Offending class: javax/servlet/Servlet.class

pom.xml

    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-web-api</artifactId>
        <version>7.0</version>
    </dependency>

Answer 1

It seems like you (your Servlet container) are trying to load some classes that have already been loaded. The servlet-api and el-api should be provided by the Servlet container.

Change your pom.xml to account for that

<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-web-api</artifactId>
    <version>7.0</version>
    <scope>provided</scope>
</dependency>