Springboot项目，使用了Oracle数据库，启动时报错invalid oracle validationQuery. SELECT 'x'

报错信息：

2019-10-10 16:00:14.242 ERROR 192 --- [  restartedMain] com.alibaba.druid.pool.DruidDataSource   : invalid oracle validationQuery. SELECT 'x', may should be : SELECT 'x' FROM DUAL
log4j:WARN No appenders could be found for logger (druid.sql.Connection).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
2019-10-10 16:00:14.687 ERROR 192 --- [  restartedMain] com.alibaba.druid.pool.DruidDataSource   : init datasource error, url: jdbc:oracle:thin:@106.14.243.179:1521:ORCL

java.sql.SQLSyntaxErrorException: ORA-00923: 未找到要求的 FROM 关键字

	at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:447) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:951) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:513) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:195) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.T4CStatement.executeForDescribe(T4CStatement.java:876) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1175) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1288) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:1498) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at oracle.jdbc.driver.OracleStatementWrapper.executeQuery(OracleStatementWrapper.java:406) ~[ojdbc6-11.2.0.3.jar:11.2.0.4.0]
	at com.alibaba.druid.pool.vendor.OracleValidConnectionChecker.isValidConnection(OracleValidConnectionChecker.java:84) ~[druid-1.1.18.jar:1.1.18]
	at com.alibaba.druid.pool.DruidAbstractDataSource.validateConnection(DruidAbstractDataSource.java:1384) ~[druid-1.1.18.jar:1.1.18]
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1672) ~[druid-1.1.18.jar:1.1.18]
	at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:932) ~[druid-1.1.18.jar:1.1.18]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_141]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_141]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_141]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_141]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1904) [spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1846) [spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1774) [spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) [spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) [spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) [spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) [spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) [spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:847) ~[spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) ~[spring-context-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.10.RELEASE.jar:5.1.10.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744) ~[spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391) ~[spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) ~[spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204) ~[spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
	at com.zhu.QaApplication.main(QaApplication.java:10) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_141]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_141]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_141]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_141]
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.1.9.RELEASE.jar:2.1.9.RELEASE]



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原因是properties.yml配置文件里写了 MySQL的验证连接：validationQuery: SELECT ‘x’
改成Oracle的验证连接：validationQuery: SELECT ‘x’ FROM DUAL
（其实报错信息里的第一行有提示： invalid oracle validationQuery. SELECT ‘x’, may should be : SELECT ‘x’ FROM DUAL，但还是想自己记录下来碰到的问题）

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