Polish

Add back explicit casting to ensure compatibility if
overloaded methods are added.

Issue: gh-4632

webflux/src/test/java/org/springframework/security/web/server/DefaultServerRedirectStrategyTests.java

@@ -47,12 +47,12 @@ public class DefaultServerRedirectStrategyTests {
 
 	@Test(expected = IllegalArgumentException.class)
 	public void sendRedirectWhenLocationNullThenException() {
-		this.strategy.sendRedirect(this.exchange, null);
+		this.strategy.sendRedirect(this.exchange, (URI) null);
 	}
 
 	@Test(expected = IllegalArgumentException.class)
 	public void sendRedirectWhenExchangeNullThenException() {
-		this.strategy.sendRedirect(null, this.location);
+		this.strategy.sendRedirect((ServerWebExchange) null, this.location);
 	}
 
 	@Test

webflux/src/test/java/org/springframework/security/web/server/authentication/RedirectServerAuthenticationEntryPointTests.java

@@ -57,7 +57,7 @@ public class RedirectServerAuthenticationEntryPointTests {
 
 	@Test(expected = IllegalArgumentException.class)
 	public void constructorStringWhenNullLocationThenException() {
-		new RedirectServerAuthenticationEntryPoint(null);
+		new RedirectServerAuthenticationEntryPoint((String) null);
 	}
 
 	@Test