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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