From 2531a82606cdcc96ee468cb0bdd0f0265cf9930e Mon Sep 17 00:00:00 2001
From: Daniel Naber <dnaber@apache.org>
Date: Sat, 13 May 2006 13:29:22 +0000
Subject: [PATCH] init the cause of exceptions so no information is lost when
 this exception occurs

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@406096 13f79535-47bb-0310-9956-ffa450edef68
---
 src/java/org/apache/lucene/store/MMapDirectory.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/java/org/apache/lucene/store/MMapDirectory.java b/src/java/org/apache/lucene/store/MMapDirectory.java
index d71e207c9da..4acf0582e1a 100644
--- a/src/java/org/apache/lucene/store/MMapDirectory.java
+++ b/src/java/org/apache/lucene/store/MMapDirectory.java
@@ -174,7 +174,9 @@ public class MMapDirectory extends FSDirectory {
       try {
         clone.seek(getFilePointer());
       } catch(IOException ioe) {
-        throw new RuntimeException(ioe);
+        RuntimeException newException = new RuntimeException(ioe);
+        newException.initCause(ioe);
+        throw newException;
       };
       return clone;
     }