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

今天药忘吃喽~ 2023-09-25 17:03 13阅读 0赞

#### 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$1.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。

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：

<bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="hostName" value="${cache.redis.hostName}"/>
        <property name="port" value="${cache.redis.port}"/>
        <property name="password" value="${cache.redis.password}"/>
        <property name="database" value="${cache.redis.db}"/>
        <property name="usePool" value="true"/>
        <property name="poolConfig">
            
            <bean class="redis.clients.jedis.JedisPoolConfig">
                <property name="maxTotal" value="100"/>
                <property name="minIdle" value="20"/>
                <property name="maxWaitMillis" value="10000"/>
            </bean>
        </property>
    </bean>

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：

![在这里插入图片描述][6373ddb4a9434369bfbf1ac1be28f9e1.png]

重新启动项目，即可成功运行，如下图所示：

![在这里插入图片描述][b77a8b53290245878179efc82856f905.png]

## 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

![在这里插入图片描述][72d6149763cf48b08c458a2c754fe5cb.png]

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

![在这里插入图片描述][51fb7ff5e470489bbb2a951b0807a8ce.png]

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。

[6373ddb4a9434369bfbf1ac1be28f9e1.png]: https://img-blog.csdnimg.cn/6373ddb4a9434369bfbf1ac1be28f9e1.png
[b77a8b53290245878179efc82856f905.png]: https://img-blog.csdnimg.cn/b77a8b53290245878179efc82856f905.png
[72d6149763cf48b08c458a2c754fe5cb.png]: https://img-blog.csdnimg.cn/72d6149763cf48b08c458a2c754fe5cb.png
[51fb7ff5e470489bbb2a951b0807a8ce.png]: https://img-blog.csdnimg.cn/51fb7ff5e470489bbb2a951b0807a8ce.png