tomcat作为客户端时出现WARN警告 about dubbo

[domingoxx]

同样遇到此问题， 诸位有解决办法吗。

昨天经过测试发现，在我这边发现了一个规律。

测试步骤如下：

1. 开启容器热部署（某些容器是默认开启）
2. 启动容器和应用
3. 通过创建新文件或者删除文件触发热部署
4. 在热部署重启过程中 重启zookeeper

在热部署重启过程中， zookeeper线程不会停止， 导致zookeeper还会不断重连，重连过程中如果找不到SetWatches类，则会抛出异常，之后就会不断的重试， 由于热部署之后，原来的zookeeper线程的classloader发生了变化， 无法再找到SetWatches，那么此过程就会一直持续下去。

现在尝试把热部署关闭掉看看效果。

这么重要的bug竟然没人解答？

[Xiaobaxi]

@liuluo129 tomcat版本多少，zookeeper版本多少？有没有应用系统自身的日志信息？

[jaychang9]

java.lang.NoClassDefFoundError: org/apache/zookeeper/proto/SetWatches
        at org.apache.zookeeper.ClientCnxn$SendThread.primeConnection(ClientCnxn.java:870)
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:363)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
java.lang.NoClassDefFoundError:2016-05-13 10:42:17,854 [localhost-startStop-1-SendThread(192.168.10.3:2181)] INFO  [org.apache.zookeeper.ClientCnxn] - Opening socket connection to server 192.168.10.3/192.168.10.3:2181. Will not attempt to authenticate using SASL (unknown error)
2016-05-13 10:42:17,854 [localhost-startStop-1-SendThread(192.168.10.3:2181)] INFO  [org.apache.zookeeper.ClientCnxn] - Socket connection established to 192.168.10.3/192.168.10.3:2181, initiating session
2016-05-13 10:42:17,854 [localhost-startStop-1-SendThread(192.168.10.3:2181)] WARN  [org.apache.zookeeper.ClientCnxn] - Session 0x154a3d0dcfc0005 for server 192.168.10.3/192.168.10.3:2181, unexpected error, closing socket connection and attempting reconnect
java.lang.NoClassDefFoundError: org/apache/zookeeper/proto/SetWatches
        at org.apache.zookeeper.ClientCnxn$SendThread.primeConnection(ClientCnxn.java:870)
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:363)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2016-05-13 10:42:18,988 [localhost-startStop-1-SendThread(192.168.10.3:2181)] INFO  [org.apache.zookeeper.ClientCnxn] - Opening socket connection to server 192.168.10.3/192.168.10.3:2181. Will not attempt to authenticate using SASL (unknown error)
2016-05-13 10:42:18,988 [localhost-startStop-1-SendThread(192.168.10.3:2181)] INFO  [org.apache.zookeeper.ClientCnxn] - Socket connection established to 192.168.10.3/192.168.10.3:2181, initiating session
2016-05-13 10:42:18,988 [localhost-startStop-1-SendThread(192.168.10.3:2181)] WARN  [org.apache.zookeeper.ClientCnxn] - Session 0x154a3d0dcfc0014 for server 192.168.10.3/192.168.10.3:2181, unexpected error, closing socket connection and attempting reconnect
java.lang.NoClassDefFoundError: org/apache/zookeeper/proto/SetWatches
        at org.apache.zookeeper.ClientCnxn$SendThread.primeConnection(ClientCnxn.java:870)
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:363)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2016-05-13 10:42:19,284 [localhost-startStop-1-SendThread(192.168.10.3:2181)] INFO  [org.apache.zookeeper.ClientCnxn] - Opening socket connection to server 192.168.10.3/192.168.10.3:2181. Will not attempt to authenticate using SASL (unknown error)
2016-05-13 10:42:19,284 [localhost-startStop-1-SendThread(192.168.10.3:2181)] INFO  [org.apache.zookeeper.ClientCnxn] - Socket connection established to 192.168.10.3/192.168.10.3:2181, initiating session
2016-05-13 10:42:19,284 [localhost-startStop-1-SendThread(192.168.10.3:2181)] WARN  [org.apache.zookeeper.ClientCnxn] - Session 0x154a3d0dcfc0005 for server 192.168.10.3/192.168.10.3:2181, unexpected error, closing socket connection and attempting reconnect
java.lang.NoClassDefFoundError: org/apache/zookeeper/proto/SetWatches
        at org.apache.zookeeper.ClientCnxn$SendThread.primeConnection(ClientCnxn.java:870)
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:363)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)`

我也遇到了，还没找到解决方案 。。。jdk1.8.0_74 tomcat8.0.33

[zj4775]

有人解决这个问题了吗？我用的weblogic,jdk8

[ralf0131]

The zookeeper thread is not stopped elegantly. We are looking at this issue recently.

[zyl704126612]

我这边也遇到了这个bug，有人建议重启服务，线上环境跑了很多的服务，我不可能去把所有服务重启啊！求大神赶快修复这个bug啊

[ralf0131]

Please test using the latest master branch, a patch has been applies recently, see #1763

[ralf0131]

This issue should be fixed from 2.6.3 onwards.

[maoxiaoxiong]

@liuluo129

java.lang.NoClassDefFoundError: org/apache/zookeeper/proto/SetWatches

请问这个问题你在当前版本 解决了吗

[maoxiaoxiong]

有人解决这个问题了吗？我用的weblogic,jdk8

你这个问题解决了吗 除了版本升级