Fix an eventual IndexOutOfBoundsException in RequestPredicates

sdeleuze · sdeleuze · commit 0720f9e9786a · 2017-07-20T16:05:00.000+02:00
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RequestPredicates.java b/spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RequestPredicates.java
@@ -588,7 +588,7 @@ private static String prefixWithSlash(String path) {
 
 			private static List<Element> prependWithSeparator(List<Element> elements) {
 				List<Element> result = new ArrayList<>(elements);
-				if (!(result.get(0) instanceof Separator)) {
+				if (result.isEmpty() || !(result.get(0) instanceof Separator)) {
 					result.add(0, SEPARATOR);
 				}
 				return Collections.unmodifiableList(result);

Original file line number	Diff line number	Diff line change
`@@ -588,7 +588,7 @@ private static String prefixWithSlash(String path) {`
`588`	`588`
`589`	`589`	`private static List<Element> prependWithSeparator(List<Element> elements) {`
`590`	`590`	`List<Element> result = new ArrayList<>(elements);`
`591`		`- if (!(result.get(0) instanceof Separator)) {`
	`591`	`+ if (result.isEmpty() \|\| !(result.get(0) instanceof Separator)) {`
`592`	`592`	`result.add(0, SEPARATOR);`
`593`	`593`	`}`
`594`	`594`	`return Collections.unmodifiableList(result);`