Redis with Java (Jedis, Lettuce) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new Jedis client connection.

Redis

Jedis jedis = new Jedis([1]);

Drag options to blanks, or click blank then click option'

A"localhost"

B"127.0.0.1"

C"redis-server"

D"192.168.1.1"

Attempts:

3 left

💡 Hint

Common Mistakes

Using an incorrect IP address or hostname that does not point to the Redis server.

The Jedis client connects to Redis using the server address. "127.0.0.1" is the standard localhost IP.

2fill in blank

medium

Complete the code to set a key "user" with value "Alice" in Redis using Jedis.

Redis

jedis.[1]("user", "Alice");

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Aset

Bget

Cdel

Dexists

Attempts:

3 left

💡 Hint

Common Mistakes

Using get which retrieves data instead of setting it.

The set method stores a value for a given key in Redis.

3fill in blank

hard

Fix the error in the Lettuce code to connect to Redis synchronously.

Redis

RedisClient client = RedisClient.create("redis://localhost:6379");
StatefulRedisConnection<String, String> connection = client.[1]();

Drag options to blanks, or click blank then click option'

Aconnect

BstartConnection

CopenConnection

DconnectAsync

Attempts:

3 left

💡 Hint

Common Mistakes

Using connectAsync() which returns a future, not a direct connection.

The connect() method opens a synchronous connection to Redis in Lettuce.

4fill in blank

hard

Fill both blanks to set and then get a key "count" using Jedis.

Redis

jedis.[1]("count", "10");
String value = jedis.[2]("count");

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Aset

Bget

Cdel

Dexists

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to get a value before setting it.

Using del or exists instead of get.

First, set stores the value, then get retrieves it.

5fill in blank

hard

Fill all three blanks to create a Lettuce client, connect, and set a key "name" to "Bob".

Redis

RedisClient client = RedisClient.[1]("redis://localhost:6379");
StatefulRedisConnection<String, String> connection = client.[2]();
RedisCommands<String, String> commands = connection.[3]();
commands.set("name", "Bob");

Drag options to blanks, or click blank then click option'

Acreate

Bconnect

Csync

Dopen

Attempts:

3 left

💡 Hint

Common Mistakes

Using open instead of sync for commands.

Confusing connectAsync with connect.

Use create to make the client, connect to open connection, and sync to get synchronous commands.