From 897621b3882414ff65c5a07c1a3f11758f183995 Mon Sep 17 00:00:00 2001
From: antelder <antelder@13f79535-47bb-0310-9956-ffa450edef68>
Date: Tue, 11 Aug 2009 11:24:13 +0000
Subject: Add error check to give better than just NPE

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@803064 13f79535-47bb-0310-9956-ffa450edef68
---
 .../tuscany/sca/implementation/web/runtime/jsp/ReferenceTag.java       | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/java/sca/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/jsp/ReferenceTag.java b/java/sca/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/jsp/ReferenceTag.java
index 46c5b89459..b4655e3d95 100644
--- a/java/sca/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/jsp/ReferenceTag.java
+++ b/java/sca/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/jsp/ReferenceTag.java
@@ -50,6 +50,9 @@ public class ReferenceTag extends TagSupport {
 
         ServletContext servletContext = pageContext.getServletContext();
         RuntimeComponent component = (RuntimeComponent)servletContext.getAttribute("org.apache.tuscany.sca.implementation.web.RuntimeComponent");
+        if (component == null) {
+            throw new JspException("No Web component found. Is there an <implementation.web> missing?");
+        }
         
         Class<?> typeClass;
         try {
-- 
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