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I create a Servlet in servlet3.0 with @WebSevlet like this:

@WebServlet(urlPatterns = {"/demo2"}, loadOnStartup = 1)
public class Demo2Servlet extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.getWriter().println("[Demo2Servlet][work]");
    }
}

And I add plugin tomcat7-maven-plugin in maven like this:

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
    <scope>provided</scope>
</dependency>

<plugin>
    <groupId>org.apache.tomcat.maven</groupId>
    <artifactId>tomcat7-maven-plugin</artifactId>
    <version>2.2</version>
    <configuration>
        <port>8080</port>
        <path>/web30</path>
    </configuration>
</plugin>

when I use command tomcat7:run, it give me an error:

Fatal: Servlet /web30 threw load() exception
java.lang.ClassCastException: demo2.sevlet.Demo2Servlet cannot be cast to javax.servlet.Servlet
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1144)
.......

But if I use tomcat7 in Local, it works well, Why?

what I don't understand is why the error is ClassCastException, I extends the HttpServlet!!

======================================================================= thanks to @Vikdor, you are quite right, add <scope>provided</scope> in servlet-api dependency, it works wonderful.

0 Answers0