IllegalArgumentException: The servlets named [program] and [com.test.Servlet] are both mapped to the url-pattern [/Servlet] which is not permitted

Question

I have just started working on Servlets. I have created a dynamic web project, and I was trying to copy the servlet-api.jar into lib. It didnt work out. So, I copied the jar in the workspace manually by going into the location in drive and then configured to the build path. When I ran the tomcat server 8.0, its stopping with some errors. When I comment out the servlet configuration in web.xml, the server starts. There is some problem in configuring. Hope the following error helps.

Java code

 package com.test;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

@WebServlet("/Servlet")
public class Servlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

     public Servlet() {
        super();
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     System.out.println("In Do Get");
    response.getWriter().append("Served at: ").append(request.getContextPath());
}

  /**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    System.out.println("In DO Post");
    doGet(request, response);
}

}

Web.xml

<?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xmlns="http://xmlns.jcp.org/xml/ns/javaee"  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org /xml/ns/javaee/web-app_3_1.xsd" version="3.1">
<display-name>Servlet</display-name>
 <welcome-file-list>
 <welcome-file>index.html</welcome-file>    
</welcome-file-list>
<servlet>
  <servlet-name>program</servlet-name>
  <servlet-class>com.test.Servlet</servlet-class>
 </servlet>
  <servlet-mapping>
    <servlet-name>program</servlet-name>
    <url-pattern>/Servlet</url-pattern>
   </servlet-mapping>
 </web-app>

Error

SEVERE: A child container failed during start
java.util.concurrent.ExecutionException:  org.apache.catalina.LifecycleException: Failed to start component  [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Servlet]]
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: Failed to start component   [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Servlet]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153)
... 6 more
Caused by: java.lang.IllegalArgumentException: The servlets named [program] and [com.test.Servlet] are both mapped to the url-pattern [/Servlet] which is not permitted
at org.apache.tomcat.util.descriptor.web.WebXml.addServletMapping(WebXml.java:308)
at org.apache.catalina.startup.ContextConfig.processAnnotationWebServlet(ContextConfig.java:2373)
at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2055)
at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1940)
at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1934)
at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1934)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1147)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:779)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:306)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:95)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5150)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
... 6 more

No. I have posted my web.xml.. I'm updating the servlet code as well. plz check it — Shaik Yakhoob Ali, Jul 22 '16 at 17:12
Step 1: Read the error message. Step 2: Think about the error message. Step 3: Notice that while you list only one servlet mapping for /Servlet, Tomcat states that there are two mappings. Try a different mapping for your servlet. — DwB, Jul 22 '16 at 17:13
OK.. I got it.. I have added that in Java code too. Thanks for your info — Shaik Yakhoob Ali, Jul 22 '16 at 17:15

score 0 · Answer 1 · answered Jul 22 '16 at 17:15

The servlets named [program] and [com.test.Servlet] are both mapped to the url-pattern [/Servlet] which is not permitted

Remove the conflicting servlet

  <servlet-mapping>
    <servlet-name>program</servlet-name>
    <url-pattern>/Servlet</url-pattern>
   </servlet-mapping>

score 0 · Answer 2 · answered Jul 22 '16 at 17:16

0

Solved the issue by removing "@WebServlet("/Servlet")" in Java code as tomcat was checking both servlets with the same name.

answered Jul 22 '16 at 17:16

Shaik Yakhoob Ali

15
7

IllegalArgumentException: The servlets named [program] and [com.test.Servlet] are both mapped to the url-pattern [/Servlet] which is not permitted

Java code

Web.xml

Error

2 Answers2