SpringBoot 配置 datasource.driver-class-name 属性区分大小写
本人在维护一个Springboot项目时，修改配置文件之后，启动项目发现项目启动失败，报错信息：
java.sql.SQLException: oracle.jdbc.driver.oracledriver
at com.alibaba.druid.util.JdbcUtils.createDriver(JdbcUtils.java:570) ~[druid-1.0.29.jar:1.0.29]
at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:697) [druid-1.0.29.jar:1.0.29]
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1060) [druid-1.0.29.jar:1.0.29]
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1056) [druid-1.0.29.jar:1.0.29]
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:104) [druid-1.0.29.jar:1.0.29]
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111) [spring-jdbc-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77) [spring-jdbc-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:82) [mybatis-spring-1.3.1.jar:1.3.1]
at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:68) [mybatis-spring-1.3.1.jar:1.3.1]
at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:336) [mybatis-3.4.4.jar:3.4.4]
at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84) [mybatis-3.4.4.jar:3.4.4]
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62) [mybatis-3.4.4.jar:3.4.4]
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324) [mybatis-3.4.4.jar:3.4.4]
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156) [mybatis-3.4.4.jar:3.4.4]
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109) [mybatis-3.4.4.jar:3.4.4]
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83) [mybatis-3.4.4.jar:3.4.4]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) [mybatis-3.4.4.jar:3.4.4]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) [mybatis-3.4.4.jar:3.4.4]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433) [mybatis-spring-1.3.1.jar:1.3.1]
at com.sun.proxy.$Proxy61.selectList(Unknown Source) [na:na]
at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230) [mybatis-spring-1.3.1.jar:1.3.1]
at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:137) [mybatis-3.4.4.jar:3.4.4]
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75) [mybatis-3.4.4.jar:3.4.4]
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59) [mybatis-3.4.4.jar:3.4.4]
at com.sun.proxy.$Proxy62.selectByExample(Unknown Source) [na:na]
at com.fly.console.service.FuncInfoService.queryAll(FuncInfoService.java:42) [classes/:na]
at com.fly.console.config.system.shiro.ShiroConfig.shirFilter(ShiroConfig.java:97) [classes/:na]
at com.fly.console.config.system.shiro.ShiroConfig$$EnhancerBySpringCGLIB$$5070a91.CGLIB$shirFilter$3() [classes/:na]
at com.fly.console.config.system.shiro.ShiroConfig$$EnhancerBySpringCGLIB$$5070a91$$FastClassBySpringCGLIB$$294bfbd0.invoke() [classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) [spring-core-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) [spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at com.fly.console.config.system.shiro.ShiroConfig$$EnhancerBySpringCGLIB$$5070a91.shirFilter() [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1128) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1022) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:512) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:235) [spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:702) [spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:527) [spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at com.fly.console.ConsoleApplication.main(ConsoleApplication.java:14) [classes/:na]
Caused by: java.lang.ClassNotFoundException: oracle.jdbc.driver.oracledriver
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_181]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_181]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_181]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_181]
at java.lang.Class.forName0(Native Method) ~[na:1.8.0_181]
at java.lang.Class.forName(Class.java:264) ~[na:1.8.0_181]
at com.alibaba.druid.util.JdbcUtils.createDriver(JdbcUtils.java:568) ~[druid-1.0.29.jar:1.0.29]
... 59 common frames omitted
根据报错信息推测，应该是spring在加载oracle.jdbc.driver.oracledriver这个包是出错。在Class.forName(driverClass)时会出现java.lang.ClassNotFoundException。我再去查看配置文件时，发现了错误，其原因是：我在修改application.properties文件时，不小心按到了Eclipse的快捷键，将数据库的配置信息全小写了，修改后问题解决。
//错误的配置信息
spring.datasource.url=jdbc:oracle:thin:@XX.XXX.XXX.XXX:1521:orcl
spring.datasource.driver-class-name=oracle.jdbc.driver.oracledriver
spring.datasource.username=****
spring.datasource.password=****
//正确的配置信息
spring.datasource.url=jdbc:oracle:thin:@XX.XXX.XXX.XXX:1521:orcl
spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver
spring.datasource.username=****
spring.datasource.password=****