diff --git a/kafka-connect-s3/src/main/java/io/confluent/connect/s3/S3SinkConnectorConfig.java b/kafka-connect-s3/src/main/java/io/confluent/connect/s3/S3SinkConnectorConfig.java
index 700fd4ff8..87d744436 100644
--- a/kafka-connect-s3/src/main/java/io/confluent/connect/s3/S3SinkConnectorConfig.java
+++ b/kafka-connect-s3/src/main/java/io/confluent/connect/s3/S3SinkConnectorConfig.java
@@ -15,29 +15,7 @@
 
 package io.confluent.connect.s3;
 
-import com.amazonaws.ClientConfiguration;
-import com.amazonaws.auth.AWSCredentialsProvider;
-import com.amazonaws.auth.AWSStaticCredentialsProvider;
-import com.amazonaws.auth.BasicAWSCredentials;
-import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
-import com.amazonaws.regions.RegionUtils;
-import com.amazonaws.regions.Regions;
-import com.amazonaws.services.s3.model.CannedAccessControlList;
-import com.amazonaws.services.s3.model.SSEAlgorithm;
-import io.confluent.connect.storage.common.util.StringUtils;
-import org.apache.kafka.common.Configurable;
-import org.apache.kafka.common.config.AbstractConfig;
-import org.apache.kafka.common.config.ConfigDef;
-import org.apache.kafka.common.config.ConfigDef.Importance;
-import org.apache.kafka.common.config.ConfigDef.Type;
-import org.apache.kafka.common.config.ConfigDef.Validator;
-import org.apache.kafka.common.config.ConfigDef.Width;
-import org.apache.kafka.common.config.ConfigException;
-import org.apache.kafka.common.config.types.Password;
-import org.apache.kafka.common.utils.Utils;
-import org.apache.kafka.connect.errors.ConnectException;
-import org.apache.kafka.connect.json.DecimalFormat;
-import org.apache.parquet.hadoop.metadata.CompressionCodecName;
+import static org.apache.kafka.common.config.ConfigDef.Range.atLeast;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -56,6 +34,31 @@
 import java.util.stream.IntStream;
 import java.util.zip.Deflater;
 
+import org.apache.kafka.common.Configurable;
+import org.apache.kafka.common.config.AbstractConfig;
+import org.apache.kafka.common.config.ConfigDef;
+import org.apache.kafka.common.config.ConfigDef.Importance;
+import org.apache.kafka.common.config.ConfigDef.Type;
+import org.apache.kafka.common.config.ConfigDef.Validator;
+import org.apache.kafka.common.config.ConfigDef.Width;
+import org.apache.kafka.common.config.ConfigException;
+import org.apache.kafka.common.config.types.Password;
+import org.apache.kafka.common.utils.Utils;
+import org.apache.kafka.connect.errors.ConnectException;
+import org.apache.kafka.connect.json.DecimalFormat;
+import org.apache.parquet.hadoop.metadata.CompressionCodecName;
+
+import com.amazonaws.ClientConfiguration;
+import com.amazonaws.auth.AWSCredentialsProvider;
+import com.amazonaws.auth.AWSStaticCredentialsProvider;
+import com.amazonaws.auth.BasicAWSCredentials;
+import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
+import com.amazonaws.regions.Region;
+import com.amazonaws.regions.RegionUtils;
+import com.amazonaws.regions.Regions;
+import com.amazonaws.services.s3.model.CannedAccessControlList;
+import com.amazonaws.services.s3.model.SSEAlgorithm;
+
 import io.confluent.connect.s3.format.avro.AvroFormat;
 import io.confluent.connect.s3.format.bytearray.ByteArrayFormat;
 import io.confluent.connect.s3.format.json.JsonFormat;
@@ -67,6 +70,7 @@
 import io.confluent.connect.storage.common.GenericRecommender;
 import io.confluent.connect.storage.common.ParentValueRecommender;
 import io.confluent.connect.storage.common.StorageCommonConfig;
+import io.confluent.connect.storage.common.util.StringUtils;
 import io.confluent.connect.storage.format.Format;
 import io.confluent.connect.storage.partitioner.DailyPartitioner;
 import io.confluent.connect.storage.partitioner.DefaultPartitioner;
@@ -75,8 +79,6 @@
 import io.confluent.connect.storage.partitioner.PartitionerConfig;
 import io.confluent.connect.storage.partitioner.TimeBasedPartitioner;
 
-import static org.apache.kafka.common.config.ConfigDef.Range.atLeast;
-
 public class S3SinkConnectorConfig extends StorageSinkConnectorConfig {
 
   // S3 Group
@@ -1123,14 +1125,14 @@ public void ensureValid(String name, Object region) {
         throw new ConfigException(
             name,
             region,
-            "Value must be one of: " + Utils.join(RegionUtils.getRegions(), ", ")
+            "Value must be one of: " + RegionUtils.getRegions().stream().map(Region::toString).collect(Collectors.joining(", "))
         );
       }
     }
 
     @Override
     public String toString() {
-      return "[" + Utils.join(RegionUtils.getRegions(), ", ") + "]";
+      return "[" + RegionUtils.getRegions().stream().map(Region::toString).collect(Collectors.joining(", ")) + "]";
     }
   }
 
@@ -1144,7 +1146,7 @@ private static class CompressionTypeValidator implements ConfigDef.Validator {
         TYPES_BY_NAME.put(compressionType.name, compressionType);
         names.add(compressionType.name);
       }
-      ALLOWED_VALUES = Utils.join(names, ", ");
+      ALLOWED_VALUES = String.join(", ", names);
     }
 
     @Override
@@ -1220,7 +1222,7 @@ public void ensureValid(String name, Object compressionCodecName) {
 
     @Override
     public String toString() {
-      return "[" + Utils.join(ALLOWED_VALUES, ", ") + "]";
+      return "[" + String.join(", ", ALLOWED_VALUES) + "]";
     }
   }
 
@@ -1234,7 +1236,7 @@ private static class CannedAclValidator implements ConfigDef.Validator {
         ACLS_BY_HEADER_VALUE.put(acl.toString(), acl);
         aclHeaderValues.add(acl.toString());
       }
-      ALLOWED_VALUES = Utils.join(aclHeaderValues, ", ");
+      ALLOWED_VALUES = String.join(", ", aclHeaderValues);
     }
 
     @Override