How to connect HttpServlet with Spring Application Context in web.xml?

Question

I'm trying to connect my FooServlet which extends HttpServlet with the ApplicationContext which is in the same Project. The Application Context is already used by a Wicket Servlet

It works with

servletContext = this.getServletContext();
wac = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
(IMyBean)wac().getBean("myServiceBean")

Now I try to aviod to use explicitly Spring Classes in my Code (WebApplicationContextUtils) as it's not the IoC way.

The Wicket Servlet is connected with the Application context in the web.xml

<servlet>
  <servlet-name>ExampleApplication</servlet-name>
  <servlet-class>org.apache.wicket.protocol.http.WicketServlet</servlet-class>
    <init-param>
      <param-name>applicationFactoryClassName</param-name>
      <param-value>org.apache.wicket.spring.SpringWebApplicationFactory</param-value>
    </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>

I found the class Spring HttpServletBean but I don't know if it serves for my Case

I'm unclear as to what you're trying to achieve - you want to connect your servlet with the app context, but without putting Spring code in the servlet? — skaffman
– skaffman, Commented Dec 8, 2009 at 13:30
exactly, I guess there is a way to connect FooServlet with ApplicationContext in the web.xml. I know how it works for Wicket and Spring MVC but not for a Basic HttpServlet — Martin Dürrmeier
– Martin Dürrmeier, Commented Dec 8, 2009 at 14:01
But Spring MVC and Wicket both contain Spring code. How do you expect to access the Spring context without Spring code in your servlet? — skaffman
– skaffman, Commented Dec 8, 2009 at 14:41
I thought there is a class like org.apache.wicket.spring.SpringWebApplicationFactory for normal HttpServlets without Wicket. — Martin Dürrmeier
– Martin Dürrmeier, Commented Dec 8, 2009 at 15:13
Martin Dürrmeiers answer confirmed at springsource forum.springsource.org/showthread.php?t=75289 — user327804
– user327804, Commented Apr 28, 2010 at 11:35

Martin Dürrmeier · Accepted Answer · 2013-11-13 15:38:04Z

15

I found a way to inject Beans in my HttpServlet (Note: I don't need a Presentation View, otherwise there are more advanced Spring Classes)

Add a ContextLoaderListener to web.xml so that Spring's root WebApplicationContext is loaded

   <listener>
      <listener-class>
        org.springframework.web.context.ContextLoaderListener
      </listener-class>
   </listener>

Configure Servlet using Springs HttpRequestHandlerServlet Class

<servlet>
 <servlet-name>FooServlet</servlet-name>
 <display-name>Foo Servlet</display-name>
 <servlet-class>
      org.springframework.web.context.support.HttpRequestHandlerServlet
    </servlet-class>
</servlet>

Let your Servlet implement the org.springframework.web.HttpRequestHandler Interface

Define your Servlet as a Bean in ApplicationContext (beanID must be same as "servlet-name"). Now it's possible to inject all necassary Beans in the Spring DependencyInjection way without dependency lookup.

edited Nov 13, 2013 at 15:38

answered Jan 12, 2010 at 17:14

Martin Dürrmeier

1,6835 gold badges18 silver badges36 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

blong Over a year ago

Martin, do you know of any way to inject an HttpServlet (whose source cannot change) into a Spring Web App DAO class? ... I have an HttpServlet that I need to initialize data and I need to call it when my app is deployed. It's been quite a problem for me. Any thoughts?

Martin Dürrmeier Over a year ago

Thanks Paŭlo, the formatting was somehow broken, it's the same as servlet-name

Adriaan Koster Over a year ago

You also need a <servlet-mapping>

Anand Over a year ago

@MartinDürrmeier- This is for single servlet...what if i have multiple servlets in my application?

Shreeni · Accepted Answer · 2009-12-09 09:35:32Z

2

I think you should use Spring utilities like RequestContextUtils.getWebApplicationContext(request, application); to hookup the Spring Context within your Servlet. Agreed this is no DI/IoC, but the servlet is no bean as well !

answered Dec 9, 2009 at 9:35

Shreeni

2951 gold badge4 silver badges12 bronze badges

Collectives™ on Stack Overflow

How to connect HttpServlet with Spring Application Context in web.xml?

2 Answers 2

4 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related