make an ExpiredSession constant equal to the SessionExpired exception
make an ExpiredSession constant equal to the SessionExpired exception

I'm not sure this is the right answer, but I guess we'll see...

zk-ruby/zookeeper,rickypai/zookeeper,songling88/zookeeper,zk-ruby/zookeeper,rickypai/zookeeper,rickypai/zookeeper,songling88/zookeeper,songling88/zookeeper,songling88/zookeeper,zk-ruby/zookeeper,rickypai/zookeeper