描述：
springboot 项目，由于不能直接从官网拉取 oracle 依赖，因此手动导入 oralce6.jar 包，程序正常执行，但是打包时，报如下错误。
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: oracle.jdbc.driver.OracleDriver
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
... 97 common frames omitted
Caused by: java.lang.IllegalStateException: Cannot load driver class: oracle.jdbc.driver.OracleDriver
at org.springframework.util.Assert.state(Assert.java:94) ~[spring-core-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName(DataSourceProperties.java:222) ~[spring-boot-autoconfigure-2.1.8.RELEASE.jar:2.1.8.RELEASE]
at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.initializeDataSourceBuilder(DataSourceProperties.java:174) ~[spring-boot-autoconfigure-2.1.8.RELEASE.jar:2.1.8.RELEASE]
at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource(DataSourceConfiguration.java:43) ~[spring-boot-autoconfigure-2.1.8.RELEASE.jar:2.1.8.RELEASE]
at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari.dataSource(DataSourceConfiguration.java:85) ~[spring-boot-autoconfigure-2.1.8.RELEASE.jar:2.1.8.RELEASE]
at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari$$EnhancerBySpringCGLIB$$a3daaa7.CGLIB$dataSource$0(<generated>) ~[spring-boot-autoconfigure-2.1.8.RELEASE.jar:2.1.8.RELEASE]
at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari$$EnhancerBySpringCGLIB$$a3daaa7$$FastClassBySpringCGLIB$$7351cff7.invoke(<generated>) ~[spring-boot-autoconfigure-2.1.8.RELEASE.jar:2.1.8.RELEASE]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari$$EnhancerBySpringCGLIB$$a3daaa7.dataSource(<generated>) ~[spring-boot-autoconfigure-2.1.8.RELEASE.jar:2.1.8.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_201]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_201]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
... 98 common frames omitted解决办法：
在 pom.xml 文件中加入如下依赖，通过 systemPath 指定 oracle6.jar 包所在的位置
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc</artifactId>
<version>6</version>
<scope>system</scope>
<systemPath>${basedir}/lib/ojdbc6.jar</systemPath> <!-- must match file name -->
</dependency>通过上述解决办法，在打包过程中不会报错了，但执行时，报同样的错误 ！！！
在此猜测，mvn install 不能将手动添加驱动打入 jar 包，在此只是猜测（由于还没有深入研究 maven），希望大神多多指点。
解决办法二：
定制库到Maven本地资源库，再通过 maven 依赖导入到项目中。
1： 将 oralce6 驱动安装到本地
mvn install:install-file -DgroupId=com.oracle2 "-DartifactId=ojdbc62" "-Dversion=11.2.1" "-Dpackaging=jar" "-Dfile=./ojdbc6.jar"注： DgroupId ，DartifactId，Dversion 这三个参数可以自己指定。
Dfile 为 jar 包所在的路径
执行后如下图所示：
2： 使用方法
<dependency>
<groupId>com.oracle2</groupId>
<artifactId>ojdbc62</artifactId>
<version>11.2.1</version>
</dependency>问题成功解决，亲测有效 。 .............................
