Spring Filter not getting invoked - spring

Question

I added a CORS filter to my application, but it does not seem to be executed (no prints).
The filter is this:
#Component
public class SimpleCORSFilter extends OncePerRequestFilter {
#Override
protected void doFilterInternal(HttpServletRequest req,
HttpServletResponse res, FilterChain filterChain)
throws ServletException, IOException {
System.out.println("EXECUTING");
HttpServletResponse response = (HttpServletResponse) res;
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods",
"POST, GET, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers",
"X-Requested-With,Content-Type");
filterChain.doFilter(req, res);
}
}
Then I added the filter in the web.xml, which is the following:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<!-- The definition of the Root Spring Container shared by all Servlets
and Filters -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/servlet-context.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>rest</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>rest</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
<filter>
<filter-name>simpleCORSFilter</filter-name>
<filter-class>org.lh.gestorepazienti.web.SimpleCORSFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>simpleCORSFilter</filter-name>
<servlet-name>rest</servlet-name>
</filter-mapping>
<filter>
<filter-name>OpenSessionInViewFilter</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>OpenSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
Where could it be possibly wrong?

Answer 1

First, it is uncommon to name the Root Spring Container xml file servlet-context.xml. This name is normally used for the DispatcherServlet configuration when using spring-mvc. You'd better use applicationContext.xml.
But anyway, you should use a DelegatingProxyFilter to allow proper initialization of the spring filter :
<filter>
<filter-name>simpleCORSFilter</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
The DelegatingProxyFilter will search in root context a bean named simpleCORSFilter and will delegate the doFilter method to it.

Answer 2

You can use URLMapping as well