From 7f0048a899b8313edea3b3fa3f96691449519cbe Mon Sep 17 00:00:00 2001
From: Phillip Webb <pwebb@pivotal.io>
Date: Wed, 20 Dec 2017 22:58:57 -0800
Subject: [PATCH] Use fast exceptions when enumerating resources

Update the `LaunchedURLClassLoader` used for fat jar support so that
each iteration on a `findResources` result also allows for fast
exceptions.

Fixes gh-11406
---
 .../boot/loader/LaunchedURLClassLoader.java   | 36 ++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/LaunchedURLClassLoader.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/LaunchedURLClassLoader.java
index 25a9e6f4ba..9755d0317d 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/LaunchedURLClassLoader.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/LaunchedURLClassLoader.java
@@ -65,7 +65,7 @@ public class LaunchedURLClassLoader extends URLClassLoader {
 	public Enumeration<URL> findResources(String name) throws IOException {
 		Handler.setUseFastConnectionExceptions(true);
 		try {
-			return super.findResources(name);
+			return new UseFastConnectionExceptionsEnumeration(super.findResources(name));
 		}
 		finally {
 			Handler.setUseFastConnectionExceptions(false);
@@ -182,4 +182,38 @@ public class LaunchedURLClassLoader extends URLClassLoader {
 		}
 	}
 
+	private static class UseFastConnectionExceptionsEnumeration
+			implements Enumeration<URL> {
+
+		private final Enumeration<URL> delegate;
+
+		UseFastConnectionExceptionsEnumeration(Enumeration<URL> delegate) {
+			this.delegate = delegate;
+		}
+
+		@Override
+		public boolean hasMoreElements() {
+			Handler.setUseFastConnectionExceptions(true);
+			try {
+				return this.delegate.hasMoreElements();
+			}
+			finally {
+				Handler.setUseFastConnectionExceptions(false);
+			}
+
+		}
+
+		@Override
+		public URL nextElement() {
+			Handler.setUseFastConnectionExceptions(true);
+			try {
+				return this.delegate.nextElement();
+			}
+			finally {
+				Handler.setUseFastConnectionExceptions(false);
+			}
+		}
+
+	}
+
 }