My class is not a servlet error

Question

I have the following servlet code ``` public void doPost(HttpServletRequest request, HttpServletResponse response){ Backup bup = new Backup(); bup.doBackup(); response.setContentType("text/html"); PrintWriter out; try { out = response.getWriter(); out.println("You backed up your data - well hopefully"); out.flush(); out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } ``` And the following stack trace javax.servlet.ServletException: Class view.BackupServlet is not a Servlet org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454) java.lang.Thread.run(Thread.java:619) root cause java.lang.ClassCastExceptio…

Accepted Answer

You haven't shown your class declaration - my guess is that your class doesn't extend `Servlet` or `HttpServlet`.

If it does, then check how many different servlet.jar files you have in your deployment - it could be that it's being loaded by two different classloaders.

My class is not a servlet error

Solution

Problem