redis---Redis一个异常的解决办法，异常描述：Could not get a resource from the pool

异常描述： 

 redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
     at redis.clients.util.Pool.getResource(Pool.java:22)
     at com.derbysoft.jredis.longkeytest.BorrowObject.run(BorrowObject.java:22)
     at java.lang.Thread.run(Thread.java:662)
 Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
     at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1134)
     at redis.clients.util.Pool.getResource(Pool.java:20)
     ... 2 more

1、产生原因：客户端去redis服务器拿连接（代码描述的是租用对象borrowObject）的时候，池中无可用连接，即池中所有连接被占用，且在等待时候设定的超时时间后还没拿到时，报出此异常。 

2、解决办法：调整JedisPoolConfig中maxActive为适合自己系统的阀值。 

 
          
        
         
         
 

3、重现： 

 public class BorrowObject implements Runnable {
     private ShardedJedisPool jedisPool;

     public BorrowObject(ShardedJedisPool jedisPool) {
         this.jedisPool = jedisPool;
     }

     @Override
     public void run() {
         ShardedJedis shardedJedis = null;
         try {
             shardedJedis = jedisPool.getResource();
             String value = shardedJedis.hget("LONG_KEY_TEST:AA059E03E0AB7D806E6C351F87404B06C1190", "Roc El Pinar Aparthotel");
             System.out.println(value);
         } catch (Exception e) {
             //logger.error(e);
             e.printStackTrace();
         } finally {
             jedisPool.returnResource(shardedJedis);
         }
     }
 }

 public class BorrowObjectTest {
     private ShardedJedisPool jedisPool = null;

     public BorrowObjectTest() {
         List jedisShardInfos = new ArrayList();
         JedisShardInfo jedisShardInfo = new JedisShardInfo("192.168.1.112");
         jedisShardInfo.setTimeout(1000000);
         jedisShardInfos.add(jedisShardInfo);
         jedisPool = new ShardedJedisPool(createJedisConfig(), jedisShardInfos);
     }

     private JedisPoolConfig createJedisConfig() {
         JedisPoolConfig jedisConfig = new JedisPoolConfig();
         jedisConfig.setMaxActive(2);
         jedisConfig.setMaxIdle(2);
         jedisConfig.setMaxWait(5);
         jedisConfig.setTestOnBorrow(true);
         return jedisConfig;
     }

     public static void main(String[] args) {
         BorrowObjectTest borrowObjectTest = new BorrowObjectTest();
         for (int i = 0; i < 300; i++) {
             new Thread(new BorrowObject(borrowObjectTest.jedisPool)).start();
         }
     }
 }