From ed32b4f1baeb0e0c19110c0ae857c487e4944ebd Mon Sep 17 00:00:00 2001
From: Keith Donald <kdonald@vmware.com>
Date: Fri, 12 Sep 2008 17:04:06 +0000
Subject: [PATCH] polish

---
 .../webflow/context/servlet/DefaultFlowUrlHandler.java        | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/spring-webflow/src/main/java/org/springframework/webflow/context/servlet/DefaultFlowUrlHandler.java b/spring-webflow/src/main/java/org/springframework/webflow/context/servlet/DefaultFlowUrlHandler.java
index f560cc51..cf10ae39 100644
--- a/spring-webflow/src/main/java/org/springframework/webflow/context/servlet/DefaultFlowUrlHandler.java
+++ b/spring-webflow/src/main/java/org/springframework/webflow/context/servlet/DefaultFlowUrlHandler.java
@@ -65,6 +65,10 @@ public class DefaultFlowUrlHandler implements FlowUrlHandler {
 	}
 
 	public String getFlowId(HttpServletRequest request) {
+		String pathInfo = request.getPathInfo();
+		if (pathInfo == null) {
+			throw new IllegalStateException("The HttpServletRequest pathInfo is null; unable to extract flowId");
+		}
 		return request.getPathInfo().substring(1);
 	}