NPE comes up when enable cluster and cluster link replication

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.0 CE RC4
• Fix Version/s: 6.2.0 CE RC4
• Component/s: Core Infrastructure, Fault Tolerance > Clustering Framework
• Labels:
  • QA-R
• Git Pull Request: https://github.com/shuyangzhou/liferay-portal/pull/427

In LPS-30522, we turn off hibernate's second level cache and query cache by default, it makes _hibernateCacheManager unintialized, so when enable cluster and use cluster link to do replication, a NPE may come up.

This is a bug found by analyzing code, do not need to test.