springboot sqlserver druid 报错：validateConnection false
异常如下：

java.sql.SQLException: validateConnection false
	at com.alibaba.druid.pool.DruidAbstractDataSource.validateConnection(DruidAbstractDataSource.java:1418)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1733)
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2801)
Caused by: java.lang.NullPointerException: null
	at com.alibaba.druid.wall.WallProvider.checkInternal(WallProvider.java:707)
	at com.alibaba.druid.wall.WallProvider.check(WallProvider.java:584)
	at com.alibaba.druid.wall.WallFilter.checkInternal(WallFilter.java:826)
	at com.alibaba.druid.wall.WallFilter.check(WallFilter.java:821)
	at com.alibaba.druid.wall.WallFilter.statement_execute(WallFilter.java:454)
	at com.alibaba.druid.filter.FilterChainImpl.statement_execute(FilterChainImpl.java:3008)
	at com.alibaba.druid.filter.FilterAdapter.statement_execute(FilterAdapter.java:2484)
	at com.alibaba.druid.filter.FilterEventAdapter.statement_execute(FilterEventAdapter.java:188)
	at com.alibaba.druid.filter.FilterChainImpl.statement_execute(FilterChainImpl.java:3008)
	at com.alibaba.druid.proxy.jdbc.StatementProxyImpl.execute(StatementProxyImpl.java:147)
	at com.alibaba.druid.pool.vendor.MSSQLValidConnectionChecker.isValidConnection(MSSQLValidConnectionChecker.java:50)
	at com.alibaba.druid.pool.DruidAbstractDataSource.validateConnection(DruidAbstractDataSource.java:1398)

解决方法：

spring.datasource.druid.validation-query=SELECT 1
或
spring.datasource.dynamic.druid.validation-query=SELECT 1