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

文章目录

• 1. 复现错误
• 2. 分析错误
• 3. 解决错误
• 4. 解决���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 poolat 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 poolat 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 moreCaused by: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the poolat 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 moreCaused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketTimeoutException: connect timed outat 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 moreCaused by: java.net.SocketTimeoutException: connect timed outat 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。

  1. 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。

  1. 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。

  1. 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

  1. 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

  1. 检查网络连接是否正常，并确保防火墙未阻止连接。

  2. 检查redis服务器的配置文件和协议是否正确。