From e1950e34c605437dc2796531a2c3e904fe597d66 Mon Sep 17 00:00:00 2001
From: Andy Wilkinson <awilkinson@pivotal.io>
Date: Tue, 19 Jul 2016 08:48:04 +0100
Subject: [PATCH] Include cause when throwing exception due to unreadable
 manifest

Closes gh-6417
---
 .../springframework/boot/devtools/restart/ChangeableUrls.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java b/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java
index 432086e300..d8124209fe 100644
--- a/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java
+++ b/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java
@@ -98,8 +98,8 @@ final class ChangeableUrls implements Iterable<URL> {
 			}
 			catch (IOException ex) {
 				throw new IllegalStateException(
-						"Failed to read Class-Path attribute from manifest of jar "
-								+ url);
+						"Failed to read Class-Path attribute from manifest of jar " + url,
+						ex);
 			}
 		}
 		return Collections.<URL>emptyList();