There is bug in jetty-session-redis, version 2.3.ga
Class com.ovea.jetty.session.redis.RedisSessionIdManager
method

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@Override  
protected List scavenge(final List clusterIds) {  
    List expired = new LinkedList<String>();  
    List
        @Override  
        public List
            return jedis.multi(new TransactionBlock() {  
                @Override  
                public void execute() throws JedisException {  
                    for (String clusterId : clusterIds) {  
                        exists(REDIS_SESSION_KEY + clusterId);  
                    }  
                }  
            });  
        }  
    });  
    for (int i = 0; i < status.size(); i++)  
        if (Boolean.FALSE.equals(status.get(i)))   // HERE WAS:  " ZERO.equals " 
            expired.add(clusterIds.get(i));  
    if (LOG.isDebugEnabled() && !expired.isEmpty())  
        LOG.debug("[RedisSessionIdManager] Scavenger found {} sessions to expire: {}", expired.size(), expired);  
    return expired;  
}  

Sessions were not deleting due to this invalid comparison. 

Jetty remote debug:

java -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005 -jar target/your-server.jar