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From "Toni Lyytikäinen" <tol...@gmail.com>
Subject Re: struts 2.0.8 problem implementing filter
Date Fri, 10 Aug 2007 15:32:25 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 interceptor (f.ex. return
"errorPage") which is lot simpler than getting tangled with the
RequestDispatcher stuff.

On 8/10/07, Toni Lyytikäinen <tolyen@gmail.com> wrote:
>
> 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)
> >
> > *
> > *__
> >
> >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> > For additional commands, e-mail: user-help@struts.apache.org
> >
> >
>

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