Redisson Unsupported Protocol Version 34

Introduction

Redisson is a popular Java client library for Redis, which is an open-source in-memory data structure store. It provides easy-to-use APIs for interacting with Redis and supports various data structures such as strings, lists, sets, sorted sets, and more. However, sometimes you may encounter an error message like "Unsupported protocol version 34" when using Redisson. In this article, we will explore the possible causes of this error and how to resolve it using code examples.

Understanding the Error

The error message "Unsupported protocol version 34" indicates that the Redis server you are trying to connect to is using a protocol version that is not supported by the Redisson client library. Redisson depends on the protocol specification provided by Redis, and if the server is using a newer protocol version that is not supported by the client library, this error can occur.

Causes of the Error

There are a few possible causes for this error:

  1. Redis server version: Redisson has support for a specific range of Redis server versions. If you are using an older version of Redis server that is not compatible with the Redisson client library, you may encounter this error. In this case, you can try upgrading your Redis server to a version supported by Redisson.

  2. Redisson client library version: If you are using an outdated version of Redisson library, it may not support the latest protocol versions used by Redis server. In this case, you should update your Redisson library to the latest version to ensure compatibility.

  3. Network issues: Sometimes this error can occur due to network connectivity issues or firewall restrictions. Ensure that your Redis server is accessible from the machine running the Redisson client and check if any firewall rules are blocking the connection.

Resolving the Error

To resolve the "Unsupported protocol version 34" error, you can take the following steps:

Step 1: Check Redis server version

First, check the version of your Redis server by running the following command in the Redis CLI:

redis-cli info server | grep redis_version

If the Redis server version is older than the supported version mentioned in the Redisson documentation, you should upgrade your Redis server to a supported version.

Step 2: Update Redisson library

If your Redis server version is compatible with Redisson, but you are still encountering the error, you may need to update your Redisson library to the latest version. Use a dependency management tool like Maven or Gradle to update the Redisson library in your project.

For Maven, you can update the Redisson library version by modifying the pom.xml file:

<dependencies>
    <dependency>
        <groupId>org.redisson</groupId>
        <artifactId>redisson</artifactId>
        <version>3.14.0</version> <!-- Replace with the latest version -->
    </dependency>
</dependencies>

Step 3: Verify network connectivity

If the Redis server and Redisson library versions are compatible, but you are still facing the error, ensure that there are no network connectivity issues. Verify that the Redis server is accessible from the machine running the Redisson client. You can also check if any firewall rules are blocking the connection.

Code Example

Here is a code example that demonstrates how to use Redisson to connect to a Redis server:

import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;

public class RedissonExample {

    public static void main(String[] args) {
        // Configure Redisson
        Config config = new Config();
        config.useSingleServer()
                .setAddress("redis://localhost:6379");
        
        // Create Redisson instance
        RedissonClient redisson = Redisson.create(config);
        
        // Use Redisson client for Redis operations
        // ...
        
        // Shutdown Redisson client when finished
        redisson.shutdown();
    }
}

Make sure to replace "redis://localhost:6379" with the actual Redis server address and port.

Conclusion

The "Unsupported protocol version 34" error in Redisson indicates that the Redis server is using a protocol version that is not compatible with the Redisson client library. To resolve this error, you should ensure that your Redis server version is supported by Redisson and update your Redisson library if necessary. Additionally, check for any network connectivity issues that may be causing the error. By following these steps and using the provided code examples, you should be able to successfully connect to your Redis server using Redisson.