为什么80%的码农都做不了架构师？>>> 
今天写了半天程序，有点乏了。想想来配置一下tomcat-redis-session-manager吧，但是按照 官方文档配了总是tomcat启动错误。
出现上面错误的原因其实很明显，只是我太粗心了，没有找到类。
当然首先下载所需的包了：
java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool$Config出现上面错误的原因其实很明显，只是我太粗心了，没有找到类。
当然首先下载所需的包了：
Commons-Pool Jedis tomcat-redis-session-manager
将这些jar包都丢到tomcat的lib目录下，然后配置context.xml了，将如下内容添加到context.xml中<Valve className="com.radiadesign.catalina.session.RedisSessionHandlerValve" />
<Manager className="com.radiadesign.catalina.session.RedisSessionManager"host="localhost" <!-- optional: defaults to "localhost" -->port="6379" <!-- optional: defaults to "6379" -->database="0" <!-- optional: defaults to "0" -->maxInactiveInterval="60" <!-- optional: defaults to "60" (in seconds) --> />Value字段需要出现在Manager字段之前，然后启动你的tomcat，在redis-server控制台上就可以看到如下信息了
[1638] 27 Mar 19:09:14 - Accepted 127.0.0.1:43670
[1638] 27 Mar 19:09:18 - Accepted 127.0.0.1:43671
[1638] 27 Mar 19:09:18 - 1 clients connected (0 slaves), 555984 bytes in use
[1638] 27 Mar 19:09:19 - Accepted 127.0.0.1:43673
[1638] 27 Mar 19:09:23 - 1 clients connected (0 slaves), 555984 bytes in use
[1638] 27 Mar 19:09:26 * 1 changes in 3600 seconds. Saving...
[1638] 27 Mar 19:09:26 * Background saving started by pid 7151
[1638] 27 Mar 19:09:26 - Accepted 127.0.0.1:43683
[7151] 27 Mar 19:09:26 * DB saved on disk
[1638] 27 Mar 19:09:26 * Background saving terminated with success
[1638] 27 Mar 19:09:28 - DB 0: 1 keys (1 volatile) in 4 slots HT.
[1638] 27 Mar 19:09:28 - 2 clients connected (0 slaves), 565608 bytes in use
[1638] 27 Mar 19:09:33 - DB 0: 1 keys (1 volatile) in 4 slots HT.
[1638] 27 Mar 19:09:33 - 2 clients connected (0 slaves), 565608 bytes in use
[1638] 27 Mar 19:09:38 - DB 0: 1 keys (1 volatile) in 4 slots HT.
[1638] 27 Mar 19:09:38 - 2 clients connected (0 slaves), 565608 bytes in use
[1638] 27 Mar 19:09:43 - DB 0: 1 keys (1 volatile) in 4 slots HT.
