newly established connection 和Failed to obtain JDBC Connection; nested excepti處理
比較晚，我就不說明了，直接看異常吧：
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLSyntaxErrorException: ORA-00923: 未找到要求的 FROM 關鍵字
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:81) ~[spring-jdbc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:371) ~[spring-jdbc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:446) ~[spring-jdbc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:456) ~[spring-jdbc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.queryForList(JdbcTemplate.java:484) ~[spring-jdbc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at com.app.base.framework.jpa.service.BaseJdbcTemplateServiceImpl.queryListMapBySql(BaseJdbcTemplateServiceImpl.java:35) ~[classes/:?]
... 127 more
Caused by: java.sql.SQLSyntaxErrorException: ORA-00923: 未找到要求的 FROM 關鍵字
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:445) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:879) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:450) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:193) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.T4CStatement.executeForDescribe(T4CStatement.java:873) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1167) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1281) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:1491) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at oracle.jdbc.driver.OracleStatementWrapper.executeQuery(OracleStatementWrapper.java:406) ~[ojdbc6-11.2.0.3.jar:11.2.0.3.0]
at com.alibaba.druid.pool.vendor.OracleValidConnectionChecker.isValidConnection(OracleValidConnectionChecker.java:84) ~[druid-1.1.10.jar:1.1.10]
at com.alibaba.druid.pool.DruidAbstractDataSource.validateConnection(DruidAbstractDataSource.java:1346) ~[druid-1.1.10.jar:1.1.10]
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1633) ~[druid-1.1.10.jar:1.1.10]
at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:861) ~[druid-1.1.10.jar:1.1.10]
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1229) ~[druid-1.1.10.jar:1.1.10]
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1225) ~[druid-1.1.10.jar:1.1.10]
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:90) ~[druid-1.1.10.jar:1.1.10]
at org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource.getConnection(AbstractRoutingDataSource.java:169) ~[spring-jdbc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:151) ~[spring-jdbc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
解決方案：
配置validationQuery
oracle
validationQuery=select 1 from dual
pg/mysql
validationQuery=select 1
