lamber-ken opened a new pull request #2343:
URL: https://github.com/apache/bookkeeper/pull/2343
### Motivation
We have adopted lamada expression in the code base, it needs jdk1.8 at least.
e.g org.apache.bookkeeper.meta.zk.ZKMetadataClientDriver
```
@Override
public void setSessionStateListener(SessionStateListener
sessionStateListener) {
zk.register((event) -> {
// Check for expired connection.
if (event.getType().equals(EventType.None) &&
event.getState().equals(KeeperState.Expired)) {
sessionStateListener.onSessionExpired();
}
});
}
```
### Changes
Update `Java Development Kit 1.6` to `Java Development Kit 1.8`
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