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Posted to user@struts.apache.org by Eugen Stoianovici <eu...@gmail.com> on 2007/08/10 17:20:18 UTC
struts 2.0.8 problem implementing filter
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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Re: struts 2.0.8 problem implementing filter
Posted by Laurie Harper <la...@holoweb.net>.
Eugen Stoianovici 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)
>
> *
> *__
Not knowing what onErrorUrl is set to, I can't be sure but my guess
would be that you are forwarding directly to a JSP that is using Struts
tags, without going through an action. What happens if you request the
URL directly from the browser?
L.
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Re: struts 2.0.8 problem implementing filter
Posted by Toni Lyytikäinen <to...@gmail.com>.
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 <to...@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 <eu...@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
> >
> >
>
Re: struts 2.0.8 problem implementing filter
Posted by Toni Lyytikäinen <to...@gmail.com>.
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 <eu...@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
>
>