Can't establish servlet-mapping.

[samsam007]

Hi with spring mvc 3.1 and jboss 7.1, I am trying to map a path /category/image/* into a servlet CategoryImageServlet.java class, but it doesn't establish the mapping.

Here is web.xml file:

<?xml version="1.0" encoding="ISO-8859-1"?>
<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">

<!-- The master configuration file for this Spring web application -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/config/web-application-config.xml
</param-value>
</context-param>

<!-- Loads the Spring web application context -->
<listener>
<listener-class>org.springframework.web.context.ContextLoade rListener</listener-class>
</listener>

<!-- Enables use of HTTP methods PUT and DELETE -->
<filter>
<filter-name>httpMethodFilter</filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMet hodFilter</filter-class>
</filter>

<filter-mapping>
<filter-name>httpMethodFilter</filter-name>
<servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
</filter-mapping>

<!-- Enables Spring Security -->
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFil terProxy</filter-class>
</filter>

<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
</filter-mapping>

<!-- The front controller of this Spring Web application, responsible for handling all application requests -->
<servlet>
<servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherSe rvlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value></param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<!-- Map all *.spring requests to the DispatcherServlet for handling -->
<servlet-mapping>
<servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

<!-- category image servlet -->

<servlet>
<servlet-name>categoryImageServlet</servlet-name>
<servlet-class>ix.houseware.category.servlet.CategoryImageS ervlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>categoryImageServlet</servlet-name>
<url-pattern>/category/image/*</url-pattern>
</servlet-mapping>

</web-app>

CategoryImageServlet.java:

public class CategoryImageServlet extends HttpServlet {

private static final long serialVersionUID = 1L;
private static final Logger logger = Logger.getLogger(CategoryImageServlet.class);

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
logger.info("calling CategoryImageServlet.....");
}

list.jsp:

<td><img src="/category/image/${category.categoryId}" /></td>

Any help would be very appreciated.
Thanks
Sam

[Marten Deinum]

And why should it... You have a servlet mapped to / (all incoming requests)... So indeed your image servlet is never going to be called. Swap the servlet-mapping elements or create a Controller instead of a servlet and let that handle your images.

[samsam007]

Got that resolved, thanks a lot.
Now I encountered another issue that I don't know how to auto-inject a service object in the servlet class, since I want to use a service object to get an image byte from database.

Here is my servlet class:

public class CategoryImageServlet extends HttpServlet {

private static final long serialVersionUID = 1L;
private static final Logger logger = Logger.getLogger(CategoryImageServlet.class);
@Autowired
private CategoryImageService categoryImageService;

// @Autowired
// public CategoryImageServlet(CategoryImageService categoryImageService) {
// this.categoryImageService = categoryImageService;
// }

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
// Get ID from request.
String categoryId = request.getParameter("id");
System.out.println("CategoryImageServlet.......... : "+categoryId);
// Check if ID is supplied to the request.
if (categoryId == null) {
// Do your thing if the ID is not supplied to the request.
// Throw an exception, or send 404, or show default/warning image, or just ignore it.
response.sendError(HttpServletResponse.SC_NOT_FOUN D); // 404.
return;
}

List<CategoryImages> ciList = (List<CategoryImages>) categoryImageService.findImagesByCategoryId(Intege r.parseInt(categoryId), 0, categoryImageService.count()) ;
// Lookup Image by ImageId in database.
// Do your "SELECT * FROM Image WHERE ImageID" thing.
// Image image = imageDAO.find(imageId);

Thanks
Sam

[Marten Deinum]

You cannot. The servlet isn't spring managed and as such isn't going to be dependency injected. You would have to do a lookup instead of dependency injection.

As I mentioned earlier I suggest you write a controller instead of a servlet and let the DispatcherServlet handle and dispatch the request.