From 45a1490d5d713d39cad11ac2cdfddf7820e09f4b Mon Sep 17 00:00:00 2001
From: Rob Winch <rwinch@users.noreply.github.com>
Date: Tue, 24 Sep 2019 15:44:20 -0500
Subject: [PATCH] Fix ClassCastException for JDK 9+

AuthenticationPrincipalArgumentResolverTests failed in JDK 9+ due to
its improved generic support and a ClassCastException.

Issue gh-7363
---
 .../reactive/AuthenticationPrincipalArgumentResolverTests.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/messaging/src/test/java/org/springframework/security/messaging/handler/invocation/reactive/AuthenticationPrincipalArgumentResolverTests.java b/messaging/src/test/java/org/springframework/security/messaging/handler/invocation/reactive/AuthenticationPrincipalArgumentResolverTests.java
index f33d50d008..c2748493cf 100644
--- a/messaging/src/test/java/org/springframework/security/messaging/handler/invocation/reactive/AuthenticationPrincipalArgumentResolverTests.java
+++ b/messaging/src/test/java/org/springframework/security/messaging/handler/invocation/reactive/AuthenticationPrincipalArgumentResolverTests.java
@@ -83,7 +83,7 @@ public class AuthenticationPrincipalArgumentResolverTests {
 	@Test
 	public void resolveArgumentWhenExpressionThenFound() {
 		Authentication authentication = TestAuthentication.authenticatedUser();
-		Mono<UserDetails> result = (Mono<UserDetails>) this.resolver.resolveArgument(arg0("authenticationPrincipalExpression"), null)
+		Mono<String> result = (Mono<String>) this.resolver.resolveArgument(arg0("authenticationPrincipalExpression"), null)
 				.subscriberContext(ReactiveSecurityContextHolder.withAuthentication(authentication))
 				.block();
 		assertThat(result.block()).isEqualTo(authentication.getName());