Make AccountStatusUserDetailsChecker implement MessageSourceAware

Fixes: gh-3980

core/src/main/java/org/springframework/security/authentication/AccountStatusUserDetailsChecker.java

@@ -15,17 +15,20 @@
  */
 package org.springframework.security.authentication;
 
+import org.springframework.context.MessageSource;
+import org.springframework.context.MessageSourceAware;
 import org.springframework.security.core.SpringSecurityMessageSource;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UserDetailsChecker;
 import org.springframework.context.support.MessageSourceAccessor;
+import org.springframework.util.Assert;
 
 /**
  * @author Luke Taylor
  */
-public class AccountStatusUserDetailsChecker implements UserDetailsChecker {
+public class AccountStatusUserDetailsChecker implements UserDetailsChecker, MessageSourceAware {
 
-	protected final MessageSourceAccessor messages = SpringSecurityMessageSource
+	protected MessageSourceAccessor messages = SpringSecurityMessageSource
 			.getAccessor();
 
 	public void check(UserDetails user) {
@@ -51,4 +54,13 @@ public class AccountStatusUserDetailsChecker implements UserDetailsChecker {
 					"User credentials have expired"));
 		}
 	}
+
+	/**
+	 * @since 5.2
+	 */
+	@Override
+	public void setMessageSource(MessageSource messageSource) {
+		Assert.notNull(messageSource, "messageSource cannot be null");
+		this.messages = new MessageSourceAccessor(messageSource);
+	}
 }