Fix broken login flow in shiro-basic example

shiro-basic/src/main/resources/shiro.ini

@@ -4,6 +4,17 @@
 # Usernames/passwords are based on the classic Mel Brooks' film "Spaceballs" :)
 # =============================================================================
 
+# -----------------------------------------------------------------------------
+# Shiro objects and settings
+#
+# This example authenticates programmatically in LoginAction rather than letting
+# Shiro's form filter do it, so authc only needs to know where to send an
+# unauthenticated visitor. Shiro's default is /login.jsp, which does not exist
+# here — the login form is rendered by the "login" Struts action.
+# -----------------------------------------------------------------------------
+[main]
+authc.loginUrl = /login.action
+
 # -----------------------------------------------------------------------------
 # Users and their (optional) assigned roles
 # username = password, role1, role2, ..., roleN
@@ -22,4 +33,19 @@ lonestarr = vespa, goodguy, schwartz
 [roles]
 admin = *
 schwartz = lightsaber:*
-goodguy = winnebago:drive:eagle5
+goodguy = winnebago:drive:eagle5
+
+# -----------------------------------------------------------------------------
+# Filter chain, evaluated top-down — the first matching path wins.
+#
+# Without this section Shiro protects every path, including the login page and
+# the form it posts to, which leaves an unauthenticated visitor in a redirect
+# loop. Note that shiroFilter is mapped for FORWARD as well as REQUEST, so the
+# JSPs the Struts actions forward to must be listed too, not just the actions.
+# -----------------------------------------------------------------------------
+[urls]
+/index.jsp = anon
+/login.action = anon
+/authuser.action = anon
+/pages/login.jsp = anon
+/** = authc

shiro-basic/src/main/webapp/WEB-INF/web.xml

@@ -4,6 +4,14 @@
          xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_6_0.xsd"
          version="6.0">
   <display-name>struts2shiro</display-name>
+
+  <!-- Track sessions with a cookie only. Without this the container rewrites
+       redirect URLs as ...;jsessionid=... on a visitor's first request, and
+       Jetty 11 rejects its own rewritten URI with HTTP 400 Invalid request. -->
+  <session-config>
+    <tracking-mode>COOKIE</tracking-mode>
+  </session-config>
+
   <listener>
     <listener-class>org.apache.shiro.web.env.EnvironmentLoaderListener</listener-class>
   </listener>