mino181295 opened a new pull request #1529:
URL: https://github.com/apache/zookeeper/pull/1529
```
public void addWatch(String basePath, Watcher watcher, AddWatchMode mode)
throws KeeperException, InterruptedException {
PathUtils.validatePath(basePath);
String serverPath = prependChroot(basePath);
RequestHeader h = new RequestHeader();
h.setType(ZooDefs.OpCode.addWatch);
AddWatchRequest request = new AddWatchRequest(serverPath,
mode.getMode());
ReplyHeader r = cnxn.submitRequest(h, request, new ErrorResponse(),
```
we need to validateWatcher(watcher) to avoid the case:
```
zk.addWatch("/a/b", null, PERSISTENT_RECURSIVE);
```
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