Fix type for spring.data.cassandra.contact-points

Closes gh-11354

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cassandra/CassandraAutoConfiguration.java

@@ -34,7 +34,6 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.util.StringUtils;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for Cassandra.
@@ -91,8 +90,7 @@ public class CassandraAutoConfiguration {
 			builder.withSSL();
 		}
 		builder.withPoolingOptions(getPoolingOptions());
-		String points = properties.getContactPoints();
-		builder.addContactPoints(StringUtils.commaDelimitedListToStringArray(points));
+		builder.addContactPoints(properties.getContactPoints().toArray(new String[0]));
 
 		customize(builder);
 		return builder.build();

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cassandra/CassandraProperties.java

@@ -18,6 +18,9 @@ package org.springframework.boot.autoconfigure.cassandra;
 
 import java.time.Duration;
 import java.time.temporal.ChronoUnit;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 
 import com.datastax.driver.core.ConsistencyLevel;
 import com.datastax.driver.core.ProtocolOptions;
@@ -55,7 +58,8 @@ public class CassandraProperties {
 	/**
 	 * Comma-separated list of cluster node addresses.
 	 */
-	private String contactPoints = "localhost";
+	private final List<String> contactPoints = new ArrayList<>(
+			Collections.singleton("localhost"));
 
 	/**
 	 * Port of the Cassandra server.
@@ -148,14 +152,10 @@ public class CassandraProperties {
 		this.clusterName = clusterName;
 	}
 
-	public String getContactPoints() {
+	public List<String> getContactPoints() {
 		return this.contactPoints;
 	}
 
-	public void setContactPoints(String contactPoints) {
-		this.contactPoints = contactPoints;
-	}
-
 	public int getPort() {
 		return this.port;
 	}

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -90,6 +90,12 @@
       "name": "spring.datasource.initialization-mode",
       "defaultValue": "embedded"
     },
+    {
+      "name": "spring.data.cassandra.contact-points",
+      "defaultValue": [
+        "localhost"
+      ]
+    },
     {
       "name": "spring.data.cassandra.compression",
       "defaultValue": "none"