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title description author ms.author ms.reviewer ms.date ms.topic ms.devlang ms.custom zone_pivot_groups appliesto
Quickstart: Use Azure Cache for Redis in Java
In this quickstart, you create a new Java app that uses Azure Cache for Redis
KarlErickson
karler
zhihaoguo
01/04/2022
quickstart
java
devx-track-java, devx-track-javaee, mode-api, mvc, devx-track-extended-java, ignite-2024
redis-type
✅ Azure Managed Redis
✅ Azure Cache for Redis

Quickstart: Use Azure Cache for Redis in Java with Jedis Redis client

In this quickstart, you incorporate Azure Cache for Redis into a Java app using the Jedis Redis client. Your cache is a secure, dedicated cache that is accessible from any application within Azure.

Skip to the code on GitHub

Clone the repo Java quickstart on GitHub.

Prerequisites

::: zone pivot="azure-managed-redis"

Create an Azure Managed Redis (preview) instance

[!INCLUDE managed-redis-create]

::: zone-end

::: zone pivot="azure-cache-redis"

Create an Azure Cache for Redis instance

[!INCLUDE redis-cache-create]

[!INCLUDE redis-cache-access-keys]

::: zone-end

Set up the working environment

[!INCLUDE redis-setup-working-environment]

Create a new Java app

  1. Use maven to generate a new quickstart app:

    mvn archetype:generate \
    -DarchetypeGroupId=org.apache.maven.archetypes \
    -DarchetypeArtifactId=maven-archetype-quickstart \
    -DarchetypeVersion=1.3 \
    -DinteractiveMode=false \
    -DgroupId=example.demo \
    -DartifactId=redis-jedis-test \
    -Dversion=1.0

  2. Change to the new redis-jedis-test project directory.

  3. Open the pom.xml file. In the file, you see a dependency for Jedis:

    Microsoft Entra ID authentication (recommended)

    <dependency>
    <groupId>com.azure</groupId>
    <artifactId>azure-identity</artifactId>
    <version>1.15.0</version> <!-- {x-version-update;com.azure:azure-identity;dependency} -->
</dependency>

<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>5.2.0</version> <!-- {x-version-update;redis.clients:jedis;external_dependency} -->
</dependency>

    Access key authentication

    [!INCLUDE redis-access-key-alert]

    <dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>5.2.0</version> <!-- {x-version-update;redis.clients:jedis;external_dependency} -->
</dependency>

  4. Close the pom.xml file.

  5. Open App.java and see the code with the following code:

    Microsoft Entra ID authentication (recommended)

    package example.demo;

import com.azure.identity.DefaultAzureCredential;
import com.azure.identity.DefaultAzureCredentialBuilder;
import com.azure.core.credential.TokenRequestContext;
import redis.clients.jedis.DefaultJedisClientConfig;
import redis.clients.jedis.Jedis;

/**
 * Redis test
 *
 */
public class App
{
    public static void main( String[] args )
    {

        boolean useSsl = true;

        //Construct a Token Credential from Identity library, e.g. DefaultAzureCredential / ClientSecretCredential / Client CertificateCredential / ManagedIdentityCredential etc.
        DefaultAzureCredential defaultAzureCredential = new DefaultAzureCredentialBuilder().build();

        // Fetch a Microsoft Entra token to be used for authentication. This token will be used as the password.
                String token = defaultAzureCredential
                        .getToken(new TokenRequestContext()
                                .addScopes("https://redis.azure.com/.default")).block().getToken();

        String cacheHostname = System.getenv("REDIS_CACHE_HOSTNAME");
        String username = System.getenv("USER_NAME");
        int port = Integer.parseInt(System.getenv().getOrDefault("REDIS_CACHE_PORT", "6380"));

        // Connect to the Azure Cache for Redis over the TLS/SSL port using the key.
        Jedis jedis = new Jedis(cacheHostname, port, DefaultJedisClientConfig.builder()
                .password(token) // Microsoft Entra access token as password is required.
                .user(username) // Username is Required
                .ssl(useSsl) // SSL Connection is Required
                .build());
        // Perform cache operations using the cache connection object...

        // Simple PING command
        System.out.println( "\nCache Command  : Ping" );
        System.out.println( "Cache Response : " + jedis.ping());

        // Simple get and put of integral data types into the cache
        System.out.println( "\nCache Command  : GET Message" );
        System.out.println( "Cache Response : " + jedis.get("Message"));

        System.out.println( "\nCache Command  : SET Message" );
        System.out.println( "Cache Response : " + jedis.set("Message", "Hello! The cache is working from Java!"));

        // Demonstrate "SET Message" executed as expected...
        System.out.println( "\nCache Command  : GET Message" );
        System.out.println( "Cache Response : " + jedis.get("Message"));

        // Get the client list, useful to see if connection list is growing...
        System.out.println( "\nCache Command  : CLIENT LIST" );
        System.out.println( "Cache Response : " + jedis.clientList());

        jedis.close();
    }
}

    Access key authentication

    package example.demo;

import redis.clients.jedis.DefaultJedisClientConfig;
import redis.clients.jedis.Jedis;

/**
 * Redis test
 *
 */
public class App
{
    public static void main( String[] args )
    {

        boolean useSsl = true;
        String cacheHostname = System.getenv("REDIS_CACHE_HOSTNAME");
        String cachekey = System.getenv("REDIS_CACHE_KEY");
        int port = Integer.parseInt(System.getenv().getOrDefault("REDIS_CACHE_PORT", "6380"));

        // Connect to the Azure Cache for Redis over the TLS/SSL port using the key.
        Jedis jedis = new Jedis(cacheHostname, port, DefaultJedisClientConfig.builder()
            .password(cachekey)
            .ssl(useSsl)
            .build());

        // Perform cache operations using the cache connection object...

        // Simple PING command
        System.out.println( "\nCache Command  : Ping" );
        System.out.println( "Cache Response : " + jedis.ping());

        // Simple get and put of integral data types into the cache
        System.out.println( "\nCache Command  : GET Message" );
        System.out.println( "Cache Response : " + jedis.get("Message"));

        System.out.println( "\nCache Command  : SET Message" );
        System.out.println( "Cache Response : " + jedis.set("Message", "Hello! The cache is working from Java!"));

        // Demonstrate "SET Message" executed as expected...
        System.out.println( "\nCache Command  : GET Message" );
        System.out.println( "Cache Response : " + jedis.get("Message"));

        // Get the client list, useful to see if connection list is growing...
        System.out.println( "\nCache Command  : CLIENT LIST" );
        System.out.println( "Cache Response : " + jedis.clientList());

        jedis.close();
    }
}

    This code shows you how to connect to an Azure Cache for Redis instance using the cache host name and key environment variables. The code also stores and retrieves a string value in the cache. The PING and CLIENT LIST commands are also executed.

  6. Close the App.java file.

Build and run the app

Execute the following Maven command to build and run the app:

mvn compile exec:java -D exec.mainClass=example.demo.App

In the following output, you can see that the Message key previously had a cached value. The value was updated to a new value using jedis.set. The app also executed the PING and CLIENT LIST commands.

Cache Command  : Ping
Cache Response : PONG

Cache Command  : GET Message
Cache Response : Hello! The cache is working from Java!

Cache Command  : SET Message
Cache Response : OK

Cache Command  : GET Message
Cache Response : Hello! The cache is working from Java!

Cache Command  : CLIENT LIST
Cache Response : id=777430 addr=             :58989 fd=22 name= age=1 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=32768 obl=0 oll=0 omem=0 ow=0 owmem=0 events=r cmd=client numops=6

[!INCLUDE redis-cache-resource-group-clean-up]

Next steps

In this quickstart, you learned how to use Azure Cache for Redis from a Java application. Continue to the next quickstart to use Azure Cache for Redis with an ASP.NET web app.