fix really annoying watcher warning when using java client.
fix really annoying watcher warning when using java client.

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