CODEWITHSUNDEEP
servletsservlet-filters
Vlad Skurtolov
Vlad Skurtolov

Reputation: 1054

Filter not being executed at all

I have a simple HttpServlet Filter in Tomcat 8 that I want to use on every request, and then proceed to the other servlets. But the filter is not being executed at all. Here is the web.xml

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" version="3.1">

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <filter>
        <filter-name>requestFilter</filter-name>
        <filter-class>controller.RequestsFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>requestFilter</filter-name>
        <servlet-name>index</servlet-name>
    </filter-mapping>

    <servlet>
        <servlet-name>index</servlet-name>
        <jsp-file>/index.jsp</jsp-file> 
    </servlet>
    <servlet-mapping>
        <servlet-name>index</servlet-name>
        <url-pattern>/index</url-pattern>
    </servlet-mapping>

</web-app>

and here is the filter:

@WebFilter
public class RequestsFilter extends HttpServlet implements Filter {

    static Logger log = Logger.getLogger("RequestFilter");

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;

        req.setAttribute("key", "some random string");

        log.warning("**RequestFilter**");
        filterChain.doFilter(req, resp);
    }

}

Would appreciate any help, and thanks.

Upvotes: 1

Views: 314

Answers (1)

Sundararaj Govindasamy
Sundararaj Govindasamy

Reputation: 8495

This is NOT a filter.

You are mixing up servlet and filters. Filter and Servlet are completely two different things.

public class RequestsFilter extends HttpServlet implements Filter {

I can see some issues in your web.xml as well. <servlet-name> should not be there in <filter-mapping>

 <servlet-name>index</servlet-name>

You can find a simple yet clean example here.

Upvotes: 2

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