LOG4J2-1412 added private constructor

Project: http://git-wip-us.apache.org/repos/asf/logging-log4j2/repo
Commit: http://git-wip-us.apache.org/repos/asf/logging-log4j2/commit/8f298ef7
Tree: http://git-wip-us.apache.org/repos/asf/logging-log4j2/tree/8f298ef7
Diff: http://git-wip-us.apache.org/repos/asf/logging-log4j2/diff/8f298ef7

Branch: refs/heads/LOG4J-1181
Commit: 8f298ef74a8236d692c8edad825df5582e8e43f9
Parents: 3579ac0
Author: rpopma <[email protected]>
Authored: Mon Jun 6 20:10:27 2016 +0900
Committer: rpopma <[email protected]>
Committed: Mon Jun 6 20:10:27 2016 +0900

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 log4j-api/src/main/java/org/apache/logging/log4j/util/Unbox.java | 3 +++
 1 file changed, 3 insertions(+)
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http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/8f298ef7/log4j-api/src/main/java/org/apache/logging/log4j/util/Unbox.java
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diff --git a/log4j-api/src/main/java/org/apache/logging/log4j/util/Unbox.java 
b/log4j-api/src/main/java/org/apache/logging/log4j/util/Unbox.java
index ff09b4b..e86dc69 100644
--- a/log4j-api/src/main/java/org/apache/logging/log4j/util/Unbox.java
+++ b/log4j-api/src/main/java/org/apache/logging/log4j/util/Unbox.java
@@ -61,6 +61,9 @@ public class Unbox {
     }
     private static ThreadLocal<State> threadLocalState = new ThreadLocal<>();
 
+    private Unbox() {
+        // this is a utility
+    }
     /**
      * Returns a {@code StringBuilder} containing the text representation of 
the specified primitive value.
      * This method will not allocate temporary objects.

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