alright. Maybe the problem is my Filter. I have a (Authentication-)Filter
installed. If the branch
request.getRequestDispatcher(fwd).forward(request, response);
|
is being called, the NPE occurs. If the branch
chain.doFilter(request, response);
|
is being called, the seam processes the request properly.
web.xml is:
<?xml version="1.0" encoding="UTF-8"?>
|
| <web-app xmlns="http://java.sun.com/xml/ns/j2ee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"; version="2.4">
| <distributable/>
|
| <filter>
| <filter-name>Seam Redirect Filter</filter-name>
|
<filter-class>org.jboss.seam.servlet.SeamRedirectFilter</filter-class>
| </filter>
|
| <filter>
| <filter-name>Seam Exception Filter</filter-name>
|
<filter-class>org.jboss.seam.servlet.SeamExceptionFilter</filter-class>
| </filter>
|
| <filter>
| <filter-name>Authentication</filter-name>
|
<filter-class>de.ems.dap.appengine.web.AuthenticationFilter</filter-class>
| <init-param>
| <param-name>failedForward</param-name>
| <param-value>/login.seam</param-value>
| </init-param>
| </filter>
|
| <filter-mapping>
| <filter-name>Seam Redirect Filter</filter-name>
| <url-pattern>*.seam</url-pattern>
| </filter-mapping>
|
| <filter-mapping>
| <filter-name>Authentication</filter-name>
| <url-pattern>/noch-nicht*</url-pattern>
| </filter-mapping>
|
| <listener>
|
<listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class>
| </listener>
|
| <!-- beginn workaround ... es gibt hierfuer keine andere moeglichkeit,
es ueber xdoclet einzusteuern -->
| <context-param>
| <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
| <param-value>client</param-value>
| </context-param>
| <!-- ende workaround -->
|
| <servlet>
| <servlet-name>Faces Servlet</servlet-name>
| <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
| <load-on-startup>1</load-on-startup>
| </servlet>
|
| <servlet-mapping>
| <servlet-name>Faces Servlet</servlet-name>
| <url-pattern>*.seam</url-pattern>
| </servlet-mapping>
|
| <!--
| To specify mime mappings, create a file named mime-mappings.xml, put it
in your project's mergedir.
| Organize mime-mappings.xml following this DTD slice:
|
| <!ELEMENT mime-mapping (extension, mime-type)>
| -->
|
| <!--
| To specify error pages, create a file named error-pages.xml, put it in
your project's mergedir.
| Organize error-pages.xml following this DTD slice:
|
| <!ELEMENT error-page ((error-code | exception-type), location)>
| -->
|
| <!--
| To add taglibs by xml, create a file called taglibs.xml and place it
| in your merge dir.
| -->
|
| <!--
| To set up security settings for your web app, create a file named
web-security.xml, put it in your project's mergedir.
| Organize web-security.xml following this DTD slice:
|
| <!ELEMENT security-constraint (display-name?, web-resource-collection+,
auth-constraint?, user-data-constraint?)>
| <!ELEMENT web-resource-collection (web-resource-name, description?,
url-pattern*, http-method*)>
| <!ELEMENT web-resource-name (#PCDATA)>
| <!ELEMENT url-pattern (#PCDATA)>
| <!ELEMENT http-method (#PCDATA)>
| <!ELEMENT user-data-constraint (description?, transport-guarantee)>
| <!ELEMENT transport-guarantee (#PCDATA)>
|
| <!ELEMENT login-config (auth-method?, realm-name?, form-login-config?)>
| <!ELEMENT auth-method (#PCDATA)>
| <!ELEMENT realm-name (#PCDATA)>
| <!ELEMENT form-login-config (form-login-page, form-error-page)>
| <!ELEMENT form-login-page (#PCDATA)>
| <!ELEMENT form-error-page (#PCDATA)>
| -->
|
| </web-app>
|
AuthenticationFilter is:
package de.ems.dap.appengine.web;
|
| import java.io.IOException;
|
| import javax.servlet.Filter;
| import javax.servlet.FilterChain;
| import javax.servlet.FilterConfig;
| import javax.servlet.ServletException;
| import javax.servlet.ServletRequest;
| import javax.servlet.ServletResponse;
| import javax.servlet.http.HttpServletRequest;
| import javax.servlet.http.HttpSession;
|
| import de.ems.dap.appengine.business.AppSession;
|
| /**
| * Filter class
| *
| * @web.filter name="Authentication"
| * @web.filter-mapping url-pattern="/*"
| * @web.filter-init-param
| * name="failedForward"
| * value="/login.seam"
| */
| public class AuthenticationFilter implements Filter {
|
| //private static org.apache.commons.logging.Log log =
org.apache.commons.logging.LogFactory.getLog(AuthenticationFilter.class);
| private String authenticationFailedForward;
|
| public AuthenticationFilter() {
| }
|
| public void init(FilterConfig cfg) throws ServletException {
| authenticationFailedForward = cfg.getInitParameter("failedForward");
| }
|
| public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
|
| HttpSession session = ((HttpServletRequest)
request).getSession(true);
| AppSessionHolder ash = AppSessionHolder.getInstance(session);
|
| AppSession as = null;
| if(ash!=null) {
| ash.getAppSession();
| }
| boolean ok = (as!=null);
|
| String url = ((HttpServletRequest)
request).getServletPath();
| ok |= url.startsWith("/login.");
| ok |= url.startsWith("/logout.");
| ok |= url.startsWith("/life-check.");
|
| if (ok) {
| chain.doFilter(request, response);
| } else {
| String fwd = authenticationFailedForward;
|
| request.getRequestDispatcher(fwd).forward(request, response);
| }
| }
|
| public void destroy() {
| }
|
| }
|
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