Autowiring in servlet

Question

i want to use spring autowiring in servlet so here's my code:

@Configurable
public class ImageServlet extends HttpServlet {

   @Autowired
   private SystemPropertyDao systemPropertyDao;

   @Override
   public void init() throws ServletException {


   String imagePath = systemPropertyDao.findByID(StaticParam.CONTENT_FOLDER);

}

while the SystemPropertyDao is annotated with @Repository

and my applicationContext.xml:

<context:component-scan base-package="com.basepackage" />
<mvc:annotation-driven />
<context:annotation-config />
<context:spring-configured/>

web.xml:

  <servlet>
    <servlet-name>imageServlet</servlet-name>
    <servlet-class>com.xeno.basepackage.ImageServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>imageServlet</servlet-name>
    <url-pattern>/myimages/*</url-pattern>
  </servlet-mapping>

sometimes the autowiring works and sometimes it doesn't (the reference to the spring bean systemPropertyDao is null), can anyone please tell me if i am missing something?

Solution 1

I followed the solution in the following link, and it works fine: Access Spring beans from a servlet in JBoss

public class MyServlet extends HttpServlet {

  @Autowired
  private MyService myService;

  public void init(ServletConfig config) {
    super.init(config);
    SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this,
      config.getServletContext());
  }
}

Solution 2

Remove the @Configurable annotation from your servlet and add:

SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext (this);

at the first line of your init() method.

Comments

[hiway]

thanks very much. At first I use Resource annotation, it doesn't work, and Autowired works well.

[Suryaprakash Pisay]

Thank you very much, but why they specifically mentioned in jBoss?? Won't it work in weblogic??

[Chucky]

It will work in Weblogic and even in Tomcat ! This is only the title of the documentation: the solution is actually relying upon the standard servlet api and pure Spring classes.