Setting spring session on redis server

Question

I am writing my rest apis using spring boot. And I am trying to maintain user's session on redis server. Redis is up and running on the default port 6379. I have used the lettuce jar to make connection to the redis server. But seems like my session is not being set on redis server. I try to get the session object set using uuid, and it return something like this

127.0.0.1:6379> get 02978830-2f35-47b7-a367-1f48e40d0ea0
(nil)

From redis cli, I am able to set and get the key values.

127.0.0.1:6379> set 123 123dummy
OK
127.0.0.1:6379> get 123
"123dummy"
127.0.0.1:6379>

This is code snippet where I am trying to see if the user has been logged in depending on their active session, if the session is there then I am returning user. Else I am logging em and then setting session on redis server and then returning user.

UserAttributes findUserByEmailIdOrPhoneNumber(HttpServletRequest request,
      @RequestParam(value = "userLoginWay", required = false) String userLoginWay,
      @RequestParam(value = "userPassword", required = false) String userPassword,
      @RequestParam(value = "session", required = false) String session) {
    if(request.getSession().getAttribute(session) != null) {
        //we have session return user
        return user;
    } else {
        login(userLoginWay, userPassword)
        //set the session in redis here
        String sessionUuid = UUID.randomUUID().toString();
        request.getSession().setAttribute(sessionUuid, user);
        return user;
    }
}

This user is the object which I am trying to set as a session value and uuid as a key. This is how I am trying to connect to the redis server

@Configuration
@EnableRedisHttpSession
public class SessionConfig extends AbstractHttpSessionApplicationInitializer {

    @Bean
    public LettuceConnectionFactory connectionFactory() {
        return new LettuceConnectionFactory();
    }

}

This is what I have in application.properties

#Configuring Redis server to manage sessions
spring.session.store-type=redis
spring.redis.host=localhost
spring.redis.port=6379

Any idea what's wrong with this ?

Lokesh Pandey · Accepted Answer · 2020-08-15 13:01:24Z

Ok, So I got it on my own, I did some changes in session config class and initialize it by extending AbstractHttpSessionApplicationInitializer

@EnableRedisHttpSession
public class SessionConfig {

    @Bean
    public LettuceConnectionFactory connectionFactory() {
        return new LettuceConnectionFactory();
    }
}

By extending AbstractHttpSessionApplicationInitializer, ensures that Spring Bean by the name of springSessionRepositoryFilter is registered with our Servlet Container for every request. For more information refer this

public class SessionConfigInitializer extends AbstractHttpSessionApplicationInitializer {

    public SessionConfigInitializer() {
        super(SessionConfig.class);
    }
}

After this when I looked in the redis server I can see something like this

127.0.0.1:6379> keys '*'
1) "spring:session:expirations:1597497540000"
2) "spring:session:index:org.springframework.session.FindByIndexNameSessionRepository.PRINCIPAL_NAME_INDEX_NAME:admin"
3) "spring:session:sessions:expires:dc2172eb-2282-4600-9cd3-7f5d9bbb62b8"
4) "spring:session:sessions:dc2172eb-2282-4600-9cd3-7f5d9bbb62b8"
127.0.0.1:6379>

The other aspect is from the redis server, once you set your session, depending upon what the value you are setting you need to retrieve it. Redis support six types string, list, set, zset, hash and stream. In my case it was hash so to see the value the command will be HGETALL <key>

Lokesh Pandey · Accepted Answer · 2020-08-15 15:22:26Z

1

You have to initialize the connection with redis server using its default constructor.

return new LettuceConnectionFactory(new RedisStandaloneConfiguration(host, port));

You can get values from properties file using @value or better method is marking the redis @configuration class with @ConfigurationProperties(prefix="spring.redis")
add fields String host, int port with respective getters and setters.

edited Aug 15, 2020 at 15:22

Lokesh Pandey

1,78927 silver badges56 bronze badges

answered Aug 15, 2020 at 5:54

Mike Jarsoon

1791 silver badge4 bronze badges

4 Comments

Lokesh Pandey Over a year ago

Hi Vivkek, thank you for writing. But I think creating a default constructor also creates a connection. If you look at the lettuce class, it's default value is localhost and port 6379

Mike Jarsoon Over a year ago

Please see the RedisStanaloneConfiguration, it has the default host and port as localhost:6379. github.com/spring-projects/spring-data-redis/blob/…

Mike Jarsoon Over a year ago

So, if you want to use default then you don't need to add properties in application.properties file and create session using return new LettuceConnectionFactory(new RedisStandaloneConfiguration());

Lokesh Pandey Over a year ago

Yes, I have removed em. You can also create connection using return new LettuceConnectionFactory();

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