I can't map my Servlet with my JSP

Question

I have a problem for mapping my servlet with my Java Server Page, using the JSF framework and especially the commandLink tag.

When I click on the commandLink it only reload the same productList.jsp.

Here is my map web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">

<display-name>Epimarket</display-name>
<servlet>
    <servlet-name>mainServlet</servlet-name>
    <servlet-class>com.epimarket.controller.EpimarketServlet</servlet-class>
    <init-param>
        <param-name>listURL</param-name>
        <param-value>productList.jsp</param-value>
    </init-param>
    <init-param>
        <param-name>editURL</param-name>
        <param-value>productEdit.jsp</param-value>
    </init-param>
    <init-param>
        <param-name>errorsURL</param-name>
        <param-value>errors.jsp</param-value>
    </init-param>
</servlet>

<filter>
<filter-name>MyFacesExtensionsFilter</filter-name>
<filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter</filter-class>
    <init-param> 
        <param-name>maxFileSize</param-name>
        <param-value>20m</param-value>
    </init-param>
</filter>

<filter-mapping>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <servlet-name>Faces Servlet</servlet-name>
</filter-mapping>

<filter-mapping>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <url-pattern>/faces/myFacesExtensionResource/*</url-pattern>
</filter-mapping>

<context-param>
    <param-name>javax.faces.CONFIG_FILES</param-name>
    <param-value>/WEB-INF/faces-config.xml</param-value>
</context-param>

<context-param>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>client</param-value>
</context-param>

<context-param>
    <param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
    <param-value>true</param-value>
</context-param>

<context-param>
    <param-name>org.apache.myfaces.PRETTY_HTML</param-name>
    <param-value>true</param-value>
</context-param>

<context-param>
    <param-name>org.apache.myfaces.DETECT_JAVASCRIPT</param-name>
    <param-value>false</param-value>
</context-param>

<context-param>
    <param-name>org.apache.myfaces.AUTO_SCROLL</param-name>
    <param-value>true</param-value>
</context-param>

<servlet-mapping>
    <servlet-name>mainServlet</servlet-name>
    <url-pattern>/do/*</url-pattern>
</servlet-mapping>


<servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.faces</url-pattern>
</servlet-mapping>

<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

Here is the faces-config.xml

<?xml version="1.0"?>
<!DOCTYPE   faces-config PUBLIC
        "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN"
        "http://java.sun.com/dtd/web-facesconfig_1_1.dtd">
<faces-config>
<application>
    <locale-config>
        <default-locale>fr</default-locale>
    </locale-config>
</application>

<navigation-rule>
    <from-view-id>/*</from-view-id>
    <navigation-case>
        <from-outcome>productList</from-outcome>
        <to-view-id>/productList.jsp</to-view-id>
    </navigation-case>
    <navigation-case>
        <from-outcome>productEdit</from-outcome>
        <to-view-id>/productEdit.jsp</to-view-id>
    </navigation-case>
    <navigation-case>
        <from-outcome>chart</from-outcome>
        <to-view-id>/chart.jsp</to-view-id>
    </navigation-case>
</navigation-rule>

Here is my link to create a new Product (access editProduct.jsp page)

<h:commandLink id="createProductLink" value="Ajouter un produit" action="/do/edit"/>

Prefix h is for

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>

And finally my doGet and doEditProduct methods in my Servlet :

public void                 doGet(HttpServletRequest req, HttpServletResponse res)
    throws IOException, ServletException
    {
        if (initErrors.size() != 0)
        {
            req.setAttribute("erreurs", initErrors);
            getServletContext().getRequestDispatcher(urlErrors).forward(req, res);
            return ;
        }

        String              reqType = req.getMethod().toLowerCase();
        String              action = req.getPathInfo();

        if (action == null)
            action = "/list";
        if (reqType.equals("get") && action.equals("/list"))
        {
            doProductList(req, res);
            return ;
        }
        if (reqType.equals("get") && action.equals("/delete"))
        {
            doDeleteProduct(req, res);
            return ;
        }
        if (reqType.equals("get") && action.equals("/edit"))
        {
            doEditProduct(req, res);
            return ;
        }
        if (reqType.equals("post") && action.equals("/validate"))
        {
            doValidateProduct(req, res);
            return ;
        }
        doProductList(req, res);
    }

private void                doEditProduct(HttpServletRequest req, HttpServletResponse res)
    throws IOException, ServletException
{
    int     id = Integer.parseInt(req.getParameter("id"));

    Product product = null;
    if (id != -1)
        product = service.getProduct(id);
    else
    {
        product = new Product();
        product.setId(new BigDecimal(-1));
    }

    req.setAttribute("editError", "");
    req.setAttribute("id", product.getId());
    req.setAttribute("name", product.getName());
    req.setAttribute("description", product.getDescription());
    req.setAttribute("price", product.getPrice());
    getServletContext().getRequestDispatcher((String)params.get("editURL")).forward(req, res);
}

Thank you for your help

Answer 1

With JSF you must not used servlets. You use managed beans.

In order to fix the above code, you should provide an action method, and invoke that method from your command button. In order to get more into the spirit of JSF, I'd suggest starting with a tutorial and/or a sample JSF probject.