LANG-807 RandomStringUtils throws confusing IAE when end <= start

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1348583 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 4 insertions, 0 deletions

diff --git a/src/main/java/org/apache/commons/lang3/RandomStringUtils.java b/src/main/java/org/apache/commons/lang3/RandomStringUtils.java
index a79905754..9dfee222b 100644
--- a/src/main/java/org/apache/commons/lang3/RandomStringUtils.java
+++ b/src/main/java/org/apache/commons/lang3/RandomStringUtils.java
@@ -242,6 +242,10 @@ public class RandomStringUtils {
                     start = ' ';                
                 }
             }
+        } else {
+            if (end <= start) {
+                throw new IllegalArgumentException("Parameter end (" + end + ") must be greater than start (" + start + ")");
+            }
         }
 
         char[] buffer = new char[count];