DATAREDIS-538 - Allow @TimeToLive methods that are not accessible by default.

We allow now the use of non-public classes with a @TimeToLive method and @TimeToLive on non-public methods.

Original Pull Request: #231

src/main/java/org/springframework/data/redis/core/mapping/RedisMappingContext.java

@@ -53,6 +53,7 @@ import org.springframework.util.StringUtils;
  *
  * @author Christoph Strobl
  * @author Oliver Gierke
+ * @author Mark Paluch
  * @since 1.7
  */
 public class RedisMappingContext extends KeyValueMappingContext<RedisPersistentEntity<?>, RedisPersistentProperty> {
@@ -256,6 +257,10 @@ public class RedisMappingContext extends KeyValueMappingContext<RedisPersistentE
 				Method timeoutMethod = resolveTimeMethod(type);
 				if (timeoutMethod != null) {
 
+					if (!timeoutMethod.isAccessible()) {
+						ReflectionUtils.makeAccessible(timeoutMethod);
+					}
+
 					TimeToLive ttl = AnnotationUtils.findAnnotation(timeoutMethod, TimeToLive.class);
 					try {
 						Number timeout = (Number) timeoutMethod.invoke(source);