文章目录

• 1. 复现错误
• 2. 分析错误
• 3. 解决错误
• 4. 解决此错误的其他办法

  1. 复现错误

  今天从gitlab上下载本公司的项目，但在启动时报出如下错误：

  org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'redisKeyExpirationListener' defined in file [D:\Software\...\RedisKeyExpirationListener.class]: Invocation of init method failed; nested exception is org.springframework.data.redis.RedisConnectionFailureException: Cannot get Jedis connection; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
  	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628)
  	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
  	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
  	at org.springframework.beans.factory.support.AbstractBeanFactory.getObject(AbstractBeanFactory.java:306)
  	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
  	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
  	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
  	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
  	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
  	......
  Caused by: org.springframework.data.redis.RedisConnectionFailureException: Cannot get Jedis connection; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
  	at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:198)
  	at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:345)
  	at org.springframework.data.redis.listener.KeyspaceEventMessageListener.init(KeyspaceEventMessageListener.java:80)
  	at org.springframework.data.redis.listener.KeyspaceEventMessageListener.afterPropertiesSet(KeyspaceEventMessageListener.java:132)
  	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
  	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)
  	... 59 more
  Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
  	at redis.clients.util.Pool.getResource(Pool.java:53)
  	at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226)
  	at redis.clients.jedis.JedisPool.getResource(JedisPool.java:16)
  	at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:191)
  	... 64 more
  Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketTimeoutException: connect timed out
  	at redis.clients.jedis.Connection.connect(Connection.java:207)
  	at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
  	at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767)
  	at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106)
  	at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868)
  	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)
  	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
  	at redis.clients.util.Pool.getResource(Pool.java:49)
  	... 67 more
  Caused by: java.net.SocketTimeoutException: connect timed out
  	at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
  	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
  	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
  	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
  	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
  	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
  	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
  	at java.net.Socket.connect(Socket.java:589)
  	at redis.clients.jedis.Connection.connect(Connection.java:184)
  	... 74 more
  

  具体的错误信息为redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool。

  2. 分析错误

  根据上述报错信息可知，这是redis出现了错误。

  1. 首先，检查我的redis的配置信息，如下代码所示：

  ########################################
  ###
  ### 2.redis的配置
  ###
  ########################################
  cache:
    redis:
      db: 12
      enable: true
      hostName: 127.0.0.1
      password: test
      port: 6379
  

  据此可以看出，我的redis配置没有问题。

  2. redis配置既然没有问题，则去检查Jedis ConnectionFactory的配置是否存在问题，如下代码所示：

  由上代码所示，Jedis ConnectionFactory的配置也没有问题。

  3. 继续分析错误信息，错误信息说Error creating bean with name 'redisKeyExpirationListener'...，即无法创建redisKeyExpirationListener的bean对象，则去检查RedisKeyExpirationListener类，如下代码所示：

  /**
   * @author super先生
   * @datetime 2023/3/12 16:30
   * @desc  这是对redis key过期的监听器
   */
  @Component
  @Conditional({RedisCondition.class})
  public class RedisKeyExpirationListener extends KeyExpirationEventMessageListener {
    private Logger LOG = LoggerFactory.getLogger(this.getClass());
    @Autowired
    private StringRedisTemplate redisTemplate;
    @Autowired
    private ProjectDao projectDao;
    public RedisKeyExpirationListener(RedisMessageListenerContainer listenerContainer) {
        super(listenerContainer);
    }
    @Override
    public void onMessage(Message message, byte[] pattern) {
        String key = message.toString();
        LOG.info("{} 缓存已到期", key);
        String[] split = key.split("_");
        if ("timer".equals(split[1])) {
            //
            if (!redisTemplate.hasKey(split[0])) {
                // 如果没有key，删除定时器key
                redisTemplate.delete(key);
                LOG.info("{} 对应的数据不存在，已删除", key);
                return;
            }
            String value = redisTemplate.opsForValue().get(split[0]);
            DashboardBoard dashboardBoard = JSONObject.parseObject(value, DashboardBoard.class);
            if (dashboardBoard == null) {
                // 重新设置key
                redisTemplate.opsForValue().set(split[0] + "_timer", "", 5, TimeUnit.MINUTES);
                LOG.info("{} 缓存重设", split[0]);
                return;
            }
            try {
                projectDao.update(dashboardBoard);
                redisTemplate.delete(split[0]);
                LOG.info("数据持久化, {} 缓存删除", split[0]);
            } catch (Exception e) {
                e.printStackTrace();
                // 重新设置key
                redisTemplate.opsForValue().set(split[0] + "_timer", "", 5, TimeUnit.MINUTES);
                LOG.info("{} 缓存重设", split[0]);
            }
        }
    }
  }
  

  经过对RedisKeyExpirationListener类的检查，没有返现任何问题。

  4. 继续分析上述错误，直至看到connect timed out错误信息。

  connect timed out表示连接超时，也就是说，我的redis没有启动。

  我经过反复检查后，发现我的redis确实没有启动。

  3. 解决错误

  由于我没有启动redis，启动redis即可，如下图所示：

  

  重新启动项目，即可成功运行，如下图所示：

  

  4. 解决此错误的其他办法

  我的是因为没有启动redis，导致了这个错误：Could not get a resource from the pool。

  如果你的redis启动了，但仍报出这个错误，可以参考如下解决方法，来解决你的错误：

  1. 检查redis是否崩溃(宕机)。

  2. 检查redis的连接池

  输入如下命令，进入redis服务器：

  ./redis-cli -h 127.0.0.1 -p 6379 -a passwd
  

  输入如下命令，查看当前连接数：

  INFO clients
  

  

  3. 检查redis服务器的最大连接数配置，如果需要，请将其增加。

  输入如下命令，查看最大连接数：

  config get maxclients
  

  

  4. 检查网络连接是否正常，并确保防火墙未阻止连接。

  5. 检查redis服务器的配置文件和协议是否正确。

   
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