JSP - Servlet calling goes wrong

Question

I have a problem with my practice project. Maybe I'm blind, but i can not solve the riddle. Hopefully this is not just another duplicate.

1. There is a list inside a jsp to present objects in an abstract way. From that I link each to a servlet with a <a href>.

       <c:forEach var="object" items="${dealer.objectList}" varStatus="status">
              <div class="changableElement">
                        <jsp:include page="/Object/objectDetails.jsp"></jsp:include>
                        <a href="/MyProjekt/ObjectResolverServlet/${object.id}" id="send">Change</a>
              </div>
       </c:forEach>

This works fine.

2. The ObjectResolverServlet gets the object again from background and puts it in the request as an attribute.

 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws      ServletException, IOException {
       System.out.println("Mark #1");
       String objectId = request.getPathInfo().substring(1);
       MyObject obj = dbHandler.getMyObjectById(objectId );
       System.out.println(obj);
       request.setAttribute("objectDetails", obj);
       response.setContentType("text/html");        
       getServletContext().getRequestDispatcher("/MyObjectChangePage").forward(request, response) ;
}

On MyObjectChangePage the user is able to manipulate details of obj.

3. MyObjectChangePage consists mainly of a form, textfields and submit buttons that directs to another servlet.

<form id="object_change_values_form" action="ObjectChangeServlet" method="post" >
    <div>
        <label for="name">Name:</label><br> 
        <input id="name" name="name" type="text" value="${obj.name}" />
        <span id="nameDetails"bla bla ..</span>
    </div>

    <div>
        <label for="origin"Origin:</label><br>
        <input id="origin" name="origin" type="text" value="${obj.origin}" />
        <span id="originDetails">bla bla ../span>
    </div>

    <div>
        <label for="year">Bitte Jahrgang eingeben!</label><br>
        <input id="year" name="year" type="text" value="${obj.year}" />
        <span id="yearDetails">bla bla ..</span>
    </div>

    <div>
        <label for="description">Description</label><br>
        <textarea name='description' id='description'>${obj.description}</textarea>
        <span id="descriptionDetails">bla bla ..</span>
    </div>

    <div>
        <label for="priceSelling">Price</label><br>
        <input id="priceSelling" name="priceSelling" type="text" value="${obj.priceSelling}" />
        <span id="priceSellingDetails">bla bla ..</span>
    </div>

    <input id="send" type="submit" value="Change" name = "button"/>                     
    <input id="send" type="submit" value="Cancel" name = "button"/>
</form>

4. ObjectChangeServlet is never called - instead the output Mark #1 from ObjectResolverServlet and in a new line null is printed. I found that from 'ObjectResolverServlet' the doPost method is called. Guess i made a weired mistake.

Parts of my web.xml here:

  ....
  <servlet>
    <servlet-name>ObjectChangeServlet</servlet-name>
    <servlet-class>impl.servlets.ObjectChangeServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>ObjectChangeServlet</servlet-name>
    <url-pattern>/ObjectChangeServlet</url-pattern>
  </servlet-mapping>

  <servlet>
    <servlet-name>ObjectChangePage</servlet-name>
    <jsp-file>/Object/object_change_values.jsp</jsp-file>
  </servlet>
  <servlet-mapping>
    <servlet-name>ObjectChangePage</servlet-name>
    <url-pattern>/ObjectChangePage</url-pattern>
  </servlet-mapping>

  <servlet>
    <description>Gets the object by id</description>
    <servlet-name>ObjectResolverServlet</servlet-name>
    <servlet-class>impl.servlets.ObjectResolverServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>ObjectResolverServlet</servlet-name>
    <url-pattern>/ObjectResolverServlet/*</url-pattern>
  </servlet-mapping>
  ....

Answer 1

Found the solution thanks to the good clues in the comments above. It's simply that the action in <form .. > tag must point to the processing servlet in a absolute manner, so my first attempt in 3. was absolute wrong

wrong <form id="object_change_values_form" action="ObjectChangeServlet" method="post" >

but the correct solution is
<form id="object_change_values_form" action="/MyProjekt/ObjectChangeServlet" method="post" >