Save Array or List of values to Redis cache

I'm attemptign to use Redis cloud and push an Array of String values using below code:

import com.lambdaworks.redis.RedisClient;import com.lambdaworks.redis.RedisURI;import com.lambdaworks.redis.api.StatefulRedisConnection;import com.lambdaworks.redis.api.sync.RedisCommands;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.util.ArrayList;import java.util.Iterator;import java.util.List;public class WriteToRedis {    private static final Logger logger = LoggerFactory.getLogger(ExchangeCurrencyPairScenario.class);    public static void main(String[] args) throws JsonProcessingException {        RedisClient redisClient = new RedisClient(                RedisURI.create("redis://****@cloud.redislabs.com:15162"));        StatefulRedisConnection<String, String> connection = redisClient.connect();        System.out.println("Connected to Redis");        RedisCommands<String, String> syncCommands = connection.sync();        syncCommands.rpush("key" , new String[]{"Volvo", "BMW", "Ford", "Mazda"});        connection.close();        redisClient.shutdown();}

But receive exception:

Exception in thread "main" com.lambdaworks.redis.RedisCommandExecutionException: WRONGTYPE Operation against a key holding the wrong kind of value    at com.lambdaworks.redis.LettuceFutures.await(LettuceFutures.java:127)    at com.lambdaworks.redis.LettuceFutures.awaitOrCancel(LettuceFutures.java:96)    at com.lambdaworks.redis.FutureSyncInvocationHandler.handleInvocation(FutureSyncInvocationHandler.java:61)    at com.lambdaworks.redis.internal.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:80)    at com.sun.proxy.$Proxy0.rpush(Unknown Source)    at com.reactive.api.redis.WriteToRedis.main(WriteToRedis.java:39)

I can save String values and connect to the Redis cloud cache with no issue. But it seems I have not configured the format of the value associated with the "key" correctly? How to correctly persist and Array (or List) of values to a Redis cache using Java?