diff --git a/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/PropertiesLauncher.java b/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/PropertiesLauncher.java
index c5775ef2eb..fac4d445d4 100644
--- a/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/PropertiesLauncher.java
+++ b/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/PropertiesLauncher.java
@@ -478,7 +478,6 @@ public class PropertiesLauncher extends Launcher {
 			URISyntaxException {
 		ClassLoader parentClassLoader = getClass().getClassLoader();
 		if (parentClassLoader instanceof URLClassLoader) {
-			@SuppressWarnings("resource")
 			URLClassLoader urlClassLoader = (URLClassLoader) parentClassLoader;
 			for (URL url : urlClassLoader.getURLs()) {
 				if (url.toString().endsWith(".jar") || url.toString().endsWith(".zip")) {
diff --git a/spring-boot/src/test/resources/map.yml b/spring-boot/src/test/resources/map.yml
new file mode 100644
index 0000000000..3ced7a2ed7
--- /dev/null
+++ b/spring-boot/src/test/resources/map.yml
@@ -0,0 +1,5 @@
+mymap:
+  ? key1.key2
+  : value12
+  ? key3
+  : value3
\ No newline at end of file