DATACMNS-466 - More aggressive checks for the correct Spring version.

We now actively check that the a method in a Spring class we rely on to be public actually is public and throw an exception pointing to the offending JAR in an exception that's thrown otherwise.

src/main/java/org/springframework/data/repository/config/RepositoryComponentProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2013 the original author or authors.
+ * Copyright 2012-2014 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -44,6 +44,8 @@ import org.springframework.util.Assert;
  */
 class RepositoryComponentProvider extends ClassPathScanningCandidateComponentProvider {
 
+	private static final String METHOD_NOT_PUBLIC = "AnnotationConfigUtils.processCommonDefinitionAnnotations(…) is not public! Make sure you're using Spring 3.2.5 or better. The class was loaded from %s.";
+
 	private boolean considerNestedRepositoryInterfaces;
 
 	/**
@@ -57,6 +59,8 @@ class RepositoryComponentProvider extends ClassPathScanningCandidateComponentPro
 
 		super(false);
 
+		assertRequiredSpringVersionPresent();
+
 		Assert.notNull(includeFilters);
 
 		if (includeFilters.iterator().hasNext()) {
@@ -142,6 +146,20 @@ class RepositoryComponentProvider extends ClassPathScanningCandidateComponentPro
 		this.considerNestedRepositoryInterfaces = considerNestedRepositoryInterfaces;
 	}
 
+	/**
+	 * Makes sure {@link AnnotationConfigUtils#processCommonDefinitionAnnotations(AnnotatedBeanDefinition) is public and
+	 * indicates the offending JAR if not.
+	 */
+	private static void assertRequiredSpringVersionPresent() {
+
+		try {
+			AnnotationConfigUtils.class.getMethod("processCommonDefinitionAnnotations", AnnotatedBeanDefinition.class);
+		} catch (NoSuchMethodException o_O) {
+			throw new IllegalStateException(String.format(METHOD_NOT_PUBLIC, AnnotationConfigUtils.class
+					.getProtectionDomain().getCodeSource().getLocation()), o_O);
+		}
+	}
+
 	/**
 	 * {@link org.springframework.core.type.filter.TypeFilter} that only matches interfaces. Thus setting this up makes
 	 * only sense providing an interface type as {@code targetType}.