From bb3d861fcde210e45f3d3ac59d8ee6e1e4086cb9 Mon Sep 17 00:00:00 2001
From: Sebastian Bazley <sebb@apache.org>
Date: Tue, 30 Apr 2013 17:50:45 +0000
Subject: [PATCH] Explicit boxing shows that NPE may occur so document it

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1477738 13f79535-47bb-0310-9956-ffa450edef68
---
 .../apache/commons/collections4/trie/CharacterKeyAnalyzer.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/apache/commons/collections4/trie/CharacterKeyAnalyzer.java b/src/main/java/org/apache/commons/collections4/trie/CharacterKeyAnalyzer.java
index 4b7545d1d..f3916ae36 100644
--- a/src/main/java/org/apache/commons/collections4/trie/CharacterKeyAnalyzer.java
+++ b/src/main/java/org/apache/commons/collections4/trie/CharacterKeyAnalyzer.java
@@ -65,9 +65,10 @@ public class CharacterKeyAnalyzer extends AbstractKeyAnalyzer<Character> {
 
     /**
      * {@inheritDoc}
+     * @throws NullPointerException if the key is null
      */
     public boolean isBitSet(final Character key, final int bitIndex, final int lengthInBits) {
-        return (key & mask(bitIndex)) != 0;
+        return (key.charValue() & mask(bitIndex)) != 0;
     }
 
     /**