Exception occurred when try to connect to SQL Server 2017

• Type: Bug
• Status: Closed
• Resolution: No Longer Reproducible
• Affects Version/s: 7.2.X, Master
• Fix Version/s: 7.2.X, Master
• Component/s: Core Infrastructure > Database Access
• Labels: None
• Fix Priority: 5

Steps to reproduce:

Use master-private or 72-private to connect to SQL Server 2017.

Expected result:
Liferay could connect to SQL Server 2017.

Actual result:
Exception display in console:

2019-10-30 07:52:38.325 INFO  [main][DialectDetector:159] Using dialect com.liferay.portal.dao.orm.hibernate.SQLServer2008Dialect for Microsoft SQL Server 14.0
2019-10-30 07:52:38.362 ERROR [main][PortalContextLoaderListener:114] java.lang.NullPointerException
java.lang.NullPointerException
	at com.liferay.portal.kernel.servlet.DirectServletRegistryUtil.clearServlets(DirectServletRegistryUtil.java:25)
	at com.liferay.portal.spring.context.PortalContextLoaderListener.contextDestroyed(PortalContextLoaderListener.java:116)
	at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4729)
	at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5388)