关于redis报获取不到连接的问题

[niu954831496]

redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool


以下是自己对Jedis封装；写了一个单例。但是老是报以上的这个异常，而且，我只是单机连接，就经常报这个错
redis版本：3.2.9
jedis版本：2.6.2

请问各位大神，哪里出了什么问题？？感激不尽


private static Jedis jedis;

private JedisConnectionFactory jedisConnectionFactory;

private Jedis getJedis(){
if(jedis == null){
return jedisConnectionFactory.getShardInfo().createResource();
}
return jedis;
}

private RedisBean (){

}

public boolean add(final String key, final int expiresTime, final String value)
throws Exception {

if (this.getJedis().exists(key)) {
return Boolean.FALSE;
}
this.getJedis().set(key, value);
if (expiresTime > 0) {
this.getJedis().expire(key, expiresTime);
}
return Boolean.TRUE;

}