Redis Session Manager for Microservices. Check RedisClient: https://gist.github.com/Honatas/097a5dff24b99b688d40e433ebfae2bb

SessionManager.java

import java.io.IOException;

import org.apache.catalina.util.StandardSessionIdGenerator;

import redis.clients.jedis.Jedis;

public class SessionManager {
	
	private static final String SESSION_TIMEOUT_KEY = "session.timeout";
	private static final String SESSION_TIMEOUT_DEFAULT = "1800"; // 30 minutes
	private static StandardSessionIdGenerator gen = new StandardSessionIdGenerator();
	
	
	/**
	 * Creates a new session
	 */
	public static String create(String sessionData) {
		
		String sessionId = gen.generateSessionId();
		SessionManager.update(sessionId, sessionData);
		return sessionId;
	}
	
	
	/**
	 * Updates the session
	 */
	public static void update(String sessionId, String sessionData) {
		
		try (Jedis jedis = RedisClient.getConnection()) {
			jedis.set(sessionId, sessionData);
			jedis.expire(sessionId, getSessionTimeout());
		}
	}

	
	/**
	 * Retrieves session data
	 */
	public static String get(String sessionId) throws IOException {
		
		try (Jedis jedis = RedisClient.getConnection()) {
			String sessionData = jedis.get(sessionId);
			if (sessionData != null) {
				jedis.expire(sessionId, getSessionTimeout());
			}
			return sessionData;
		}
	}
	
	
	/**
	 * Refreshes session timeout
	 */
	public static void refresh(String sessionId) throws IOException {
		
		try (Jedis jedis = RedisClient.getConnection()) {
			jedis.expire(sessionId, getSessionTimeout());
		}
	}
	
	
	/**
	 * Removes the session
	 */
	public static void remove(String sessionId) {
		
		try (Jedis jedis = RedisClient.getConnection()) {
			jedis.del(sessionId);
		}
	}
	
	
	/**
	 * Sets session timeout
	 */
	public static void setSessionTimeout(Integer timeout) {
		
		try (Jedis jedis = RedisClient.getConnection()) {
			jedis.set(SESSION_TIMEOUT_KEY, timeout == null ? SESSION_TIMEOUT_DEFAULT : timeout.toString());
		}
	}
	
	
	/**
	 * Retrieves session timeout (in seconds). If not set, sets a default value.
	 */
	private static Integer getSessionTimeout() {
	
		try (Jedis jedis = RedisClient.getConnection()) {
			String timeout = jedis.get(SESSION_TIMEOUT_KEY);
			if (timeout == null) {
				timeout = SESSION_TIMEOUT_DEFAULT;
				jedis.set(SESSION_TIMEOUT_KEY, timeout);
			}
			return Integer.valueOf(timeout);
		}
	}
}