Add RedisStaticMasterReplicaConfiguration no-args constructor.

Closes #3218

Author: mp911de

src/main/java/org/springframework/data/redis/connection/RedisStaticMasterReplicaConfiguration.java

@@ -39,11 +39,18 @@ public class RedisStaticMasterReplicaConfiguration implements RedisConfiguration
 
 	private static final int DEFAULT_PORT = 6379;
 
-	private List<RedisStandaloneConfiguration> nodes = new ArrayList<>();
+	private final List<RedisStandaloneConfiguration> nodes = new ArrayList<>();
 	private int database;
 	private @Nullable String username = null;
 	private RedisPassword password = RedisPassword.none();
 
+	/**
+	 * Create a new default {@link RedisStaticMasterReplicaConfiguration}.
+	 *
+	 * @since 4.0
+	 */
+	public RedisStaticMasterReplicaConfiguration() {}
+
 	/**
 	 * Create a new {@link StaticMasterReplicaConfiguration} given {@code hostName}.
 	 *

src/test/java/org/springframework/data/redis/connection/lettuce/LettuceConnectionFactoryTests.java

@@ -543,8 +543,9 @@ void shouldInitializeMasterReplicaConnectionsEagerly() {
 
 		LettuceClientConfiguration configuration = LettuceTestClientConfiguration.builder().build();
 
-		RedisStaticMasterReplicaConfiguration elastiCache = new RedisStaticMasterReplicaConfiguration(
-				SettingsUtils.getHost()).node(SettingsUtils.getHost(), SettingsUtils.getPort() + 1);
+		RedisStaticMasterReplicaConfiguration elastiCache = new RedisStaticMasterReplicaConfiguration()
+				.node(SettingsUtils.getHost(), SettingsUtils.getPort())
+				.node(SettingsUtils.getHost(), SettingsUtils.getPort() + 1);
 
 		LettuceConnectionFactory factory = new LettuceConnectionFactory(elastiCache, configuration);
 		factory.setEagerInitialization(true);