SEC-768: Changed exception to error reported through parser context. Added entry-point-ref to cas config

core/src/main/java/org/springframework/security/config/HttpSecurityBeanDefinitionParser.java

@@ -414,7 +414,10 @@ public class HttpSecurityBeanDefinitionParser implements BeanDefinitionParser {
         	return;        	
         }
         
-        throw new IllegalStateException("Couldn't set entry point");
+        parserContext.getReaderContext().error("No AuthenticationEntryPoint could be established. Please" +
+        		"make sure you have a login mechanism configured through the namespace (such as form-login) or" +
+        		"specify a custom AuthenticationEntryPoint with the custom-entry-point-ref  ", 
+                parserContext.extractSource(element));
     }
     
     static UrlMatcher createUrlMatcher(Element element) {

samples/cas/client/src/main/webapp/WEB-INF/applicationContext-security.xml

@@ -5,7 +5,7 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
                         http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-2.0.xsd">
-    <sec:http>
+    <sec:http entry-point-ref="casProcessingFilterEntryPoint">
         <sec:intercept-url pattern="/secure/extreme/**" access="ROLE_SUPERVISOR" requires-channel="https"/>
         <sec:intercept-url pattern="/secure/**" access="ROLE_USER" />
         <sec:logout />