Using some beans in Filter bean class?

user_436103 0
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In my filter bean class, I added some beans dependency (with @Autowired annotation). But in the method doFilter(), all my dependency beans have null ...

public class FacebookOAuth implements Filter
{
@Autowired
private BusinessLogger logger;

@Autowired
private IUserSessionInfo userSessionInfo;

@Autowired
private FacebookOAuthHelper oAuthHelper;

public void init(FilterConfig fc) throws ServletException
{
    // Nothing to do
}

public void doFilter(ServletRequest sr, ServletResponse sr1, FilterChain fc) throws   IOException, ServletException
{
    // HttpServletRequest req = (HttpServletRequest)sr;
    HttpServletResponse res = (HttpServletResponse) sr1;

    String code = sr.getParameter("code");

    if (StringUtil.isNotBlankStr(code))
    {
        String authURL = this.oAuthHelper.getAuthURL(code);

this.oAuthHelper is equal at null (and other dependancy beans to) ...

Could you help me ?

In fact I don't use MVC notion on server side (Spring). For my side client I use Flex technology and BlazeDS servlet ton communicate with my server.

So, that is the reason, I use the Filter bean notion.

So, how can I handle my session bean notion in my Filter bean ?

Skaffman,

I implemented your idea, so I update my application.xml with : 

<bean id="FacebookOAuthHandler" class="com.xx.FacebookOAuthHandler" />
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
    <property name="mappings">
    <props>
       <prop key="/fbauth">FacebookOAuthHandler</prop>         
    </props>
   </property>
</bean>

and my FacebookOAuthHandler class :

public class FacebookOAuthHandler extends AbstractController
{
@Autowired
private BusinessLogger logger;

@Autowired
private IUserSessionInfo userSessionInfo;

@Autowired
private FacebookOAuthHelper oAuthHelper;

@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
        HttpServletResponse response) throws Exception {

    // TODO

    return null;
}

But, this method handleRequestInternal is never called when my URL is : http://xx.xx.xx.xx/MyApp/fbauth

servlet-filters servlets spring java
5 Answers

I was getting null pointer while accessing service class bean in filter class using Autowiring . I searched more than 100 links but not able to find solution. I am using spring Boot Application and configuration which is required to get bean in filter class :

FilterConfig.java which provides application context Object.

@Component
public class FilterConfig  implements ApplicationContextAware{

private static ApplicationContext context;


public static ApplicationContext getApplicationContext() {
       return context;
    }
public  static <T> T getBean(String name,Class<T> aClass){
    return context.getBean(name,aClass);
}

@Override
public void setApplicationContext(ApplicationContext ctx) throws BeansException {
    context = ctx;
}   

 }

in Filter class , I used this like :

 UserService userService =FilterConfig.getBean("UserService", UserService.class);

UserService this is bean name which is mentioned in 

  @Service("UserService")
  public class UserServiceImpl implements UserService { ...}

No Configuration in main class of spring Boot :SpringBootServletInitializer

user_35897490
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