Remove redundant branches from SessionManagementConfigurer.

Author: OrangeDog

config/src/main/java/org/springframework/security/config/annotation/web/configurers/SessionManagementConfigurer.java

@@ -557,17 +557,13 @@ InvalidSessionStrategy getInvalidSessionStrategy() {
 		if (this.invalidSessionStrategy != null) {
 			return this.invalidSessionStrategy;
 		}
-		if (this.invalidSessionUrl != null) {
-			this.invalidSessionStrategy = new SimpleRedirectInvalidSessionStrategy(
-					this.invalidSessionUrl);
-		}
+		
 		if (this.invalidSessionUrl == null) {
 			return null;
 		}
-		if (this.invalidSessionStrategy == null) {
-			this.invalidSessionStrategy = new SimpleRedirectInvalidSessionStrategy(
+		
+		this.invalidSessionStrategy = new SimpleRedirectInvalidSessionStrategy(
 					this.invalidSessionUrl);
-		}
 		return this.invalidSessionStrategy;
 	}
 
@@ -580,10 +576,8 @@ SessionInformationExpiredStrategy getExpiredSessionStrategy() {
 			return null;
 		}
 
-		if (this.expiredSessionStrategy == null) {
-			this.expiredSessionStrategy = new SimpleRedirectSessionInformationExpiredStrategy(
-					this.expiredUrl);
-		}
+		this.expiredSessionStrategy = new SimpleRedirectSessionInformationExpiredStrategy(
+				this.expiredUrl);
 		return this.expiredSessionStrategy;
 	}
 
@@ -596,10 +590,8 @@ AuthenticationFailureHandler getSessionAuthenticationFailureHandler() {
 			return null;
 		}
 
-		if (this.sessionAuthenticationFailureHandler == null) {
-			this.sessionAuthenticationFailureHandler = new SimpleUrlAuthenticationFailureHandler(
-					this.sessionAuthenticationErrorUrl);
-		}
+		this.sessionAuthenticationFailureHandler = new SimpleUrlAuthenticationFailureHandler(
+				this.sessionAuthenticationErrorUrl);
 		return this.sessionAuthenticationFailureHandler;
 	}