Exception for flagging errors in namespace config.

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

@@ -0,0 +1,16 @@
+package org.springframework.security.config;
+
+
+/**
+ * @author Luke Taylor
+ * @version $Id$
+ */
+public class SecurityConfigurationException extends RuntimeException {
+    public SecurityConfigurationException(String s) {
+        super(s);
+    }
+
+    public SecurityConfigurationException(String s, Throwable throwable) {
+        super(s, throwable);
+    }
+}