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From "Toni Lyytikäinen" <tol...@gmail.com>
Subject Re: struts 2.0.8 problem implementing filter
Date Fri, 10 Aug 2007 15:31:32 GMT
Sorry, but why go the hard way when you can achieve the same with a simple
interceptor? You can return a global result from a filter (f.ex. return
"errorPage") which is lot simpler than getting tangled with the
RequestDispatcher stuff.

On 8/10/07, Eugen Stoianovici <eugen.stoianovici@gmail.com> wrote:
>
> i'm trying to use a custom filter to implement authorization and i can't
> get the damned thing to work (i'm an absolute beginner, be warned).
> i'm using struts2.0.8 with tomcat 5.5
>
> my doFilter method looks like this
> public class AuthorizationFilter implements Filter {
> public void doFilter(ServletRequest request, ServletResponse response,
>            FilterChain chain) throws IOException, ServletException {
>
>        HttpServletRequest req = (HttpServletRequest) request;
>        HttpServletResponse res = (HttpServletResponse) response;
>
>        HttpSession session = req.getSession();
>        Employee employee = (Employee) session.getAttribute("user");
>        boolean hasRole = false;
>              if(employee!=null){
>            for (int i = 0; i < roleNames.length; i++) {
>                if (employee.hasRole(roleNames[i])) {
>                    hasRole = true;
>                    break;
>                }
>            }
>        }
>        if (hasRole) {
>            chain.doFilter(request, response);
>        } else {
>                req.getRequestDispatcher(onErrorUrl).forward(req, res);
>        }
> }
> }
>
> the browser reports: (line 47 is
> req.getRequestDispatcher(onErrorUrl).forward(req, res); )
>
> *type* Exception report
>
> *message*
>
> *description* _The server encountered an internal error () that
> prevented it from fulfilling this request._
>
> *exception*
>
> org.apache.jasper.JasperException
>     org.apache.jasper.servlet.JspServletWrapper.handleJspException(
> JspServletWrapper.java:476)
>
>     org.apache.jasper.servlet.JspServletWrapper.service(
> JspServletWrapper.java:389)
>
>     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java
> :315)
>
>     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
>     javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
>     security.AuthorizationFilter.doFilter(AuthorizationFilter.java:47)
>
> *root cause*
>
> java.lang.NullPointerException
>     org.apache.struts2.views.jsp.TagUtils.getStack(TagUtils.java:58)
>     org.apache.struts2.views.jsp.StrutsBodyTagSupport.getStack(
> StrutsBodyTagSupport.java:52)
>
>     org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(
> ComponentTagSupport.java:49)
>
>     org.apache.jsp.index_jsp._jspx_meth_s_005furl_005f0
> (index_jsp.java:102)
>     org.apache.jsp.index_jsp._jspService(index_jsp.java:62)
>     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
>     javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
>     org.apache.jasper.servlet.JspServletWrapper.service(
> JspServletWrapper.java:328)
>
>     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java
> :315)
>
>     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
>     javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
>     security.AuthorizationFilter.doFilter(AuthorizationFilter.java:47)
>
> *
> *__
>
>
>
>
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