From 35537aba8a24b607805f777d29ddb4e0f1ce5a2f Mon Sep 17 00:00:00 2001
From: David Montag <david.montag@neotechnology.com>
Date: Thu, 7 Apr 2011 13:08:54 -0700
Subject: [PATCH] Made failure message customizable.

---
 .../AbstractConstructorEntityInstantiator.java            | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/spring-data-commons-core/src/main/java/org/springframework/data/persistence/AbstractConstructorEntityInstantiator.java b/spring-data-commons-core/src/main/java/org/springframework/data/persistence/AbstractConstructorEntityInstantiator.java
index 7415292e2..2add9a4ce 100644
--- a/spring-data-commons-core/src/main/java/org/springframework/data/persistence/AbstractConstructorEntityInstantiator.java
+++ b/spring-data-commons-core/src/main/java/org/springframework/data/persistence/AbstractConstructorEntityInstantiator.java
@@ -57,12 +57,16 @@ public abstract class AbstractConstructorEntityInstantiator<BACKING_INTERFACE, S
     private <T extends BACKING_INTERFACE> StateBackedCreator<T, STATE> createFailingInstantiator(final Class<STATE> stateType) {
         return new StateBackedCreator<T, STATE>() {
             public T create(STATE n, Class<T> c) throws Exception {
-                throw new IllegalArgumentException(getClass().getSimpleName() + ": entity " + c +
-                        " must have either a constructor taking [" + stateType + "] or a no-arg constructor and state set method");
+                throw new IllegalArgumentException(getFailingMessageForClass(c, stateType));
             }
         };
     }
 
+    protected String getFailingMessageForClass(Class<?> entityClass, Class<STATE> stateClass) {
+        return getClass().getSimpleName() + ": entity " + entityClass +
+                " must have either a constructor taking [" + stateClass + "] or a no-arg constructor and state setter.";
+    }
+
     private <T extends BACKING_INTERFACE> StateBackedCreator<T, STATE> emptyConstructorStateSettingInstantiator(Class<T> type, Class<STATE> stateType) {
         final Constructor<T> constructor = getNoArgConstructor(type);
         if (constructor == null) return null;