From 6b5828a820c78726b05bcfb74aa199be078e882e Mon Sep 17 00:00:00 2001
From: Dave Syer <dsyer@gopivotal.com>
Date: Thu, 27 Feb 2014 10:55:23 +0000
Subject: [PATCH] Be defensive if there is no main/classes

---
 .../springframework/boot/loader/tools/MainClassFinder.java   | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/MainClassFinder.java b/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/MainClassFinder.java
index 8e3c7a9909..cdb0849f76 100644
--- a/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/MainClassFinder.java
+++ b/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/MainClassFinder.java
@@ -95,8 +95,11 @@ public abstract class MainClassFinder {
 	 */
 	public static <T> T doWithMainClasses(File rootFolder, ClassNameCallback<T> callback)
 			throws IOException {
+		if (!rootFolder.exists()) {
+			return null; // nothing to do
+		}
 		if (!rootFolder.isDirectory()) {
-			throw new IllegalArgumentException("Inavlid root folder '" + rootFolder + "'");
+			throw new IllegalArgumentException("Invalid root folder '" + rootFolder + "'");
 		}
 		String prefix = rootFolder.getAbsolutePath() + "/";
 		Deque<File> stack = new ArrayDeque<File>();