背景

        项目中需要用到oracle数据库，原本框架是用的mysql。对配置进行了修改，如下：

spring:
  datasource:
    dynamic:
      datasource:
        master:
          driver-class-name: oracle.jdbc.OracleDriver
          url: jdbc:oracle:thin:@*.*.*.*:1521:orcl
          username: ***
          password: ***

        但是启动时报错，报错信息如下：

java.sql.SQLException: not support oracle driver 5.1
    at com.alibaba.druid.pool.DruidDataSource.initCheck(DruidDataSource.java:1215) ~[druid-1.1.20.jar:1.1.20]
    at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:898) ~[druid-1.1.20.jar:1.1.20]
    at com.worktrans.core.db.DynamicDataSourceCreator.createDruidDataSource(DynamicDataSourceCreator.java:215) [db-spring-boot-starter-2.0.0-20200115.103525-1.jar:na]
    at com.worktrans.core.db.DynamicDataSourceCreator.createDataSource(DynamicDataSourceCreator.java:100) [db-spring-boot-starter-2.0.0-20200115.103525-1.jar:na]
    at com.worktrans.core.db.provider.DefaultDynamicDataSourceProvider.loadDataSources(DefaultDynamicDataSourceProvider.java:41) [db-spring-boot-starter-2.0.0-20200115.103525-1.jar:na]
    at com.worktrans.core.db.DynamicRoutingDataSource.init(DynamicRoutingDataSource.java:134) [db-spring-boot-starter-2.0.0-20200115.103525-1.jar:na]
....................余下就不放了

        查了下网上的做法，说换个版本，但是我换了还是报错，只好进行debug。

问题排查

        根据异常信息，找到了判断的代码，如下：

protected void initCheck() throws SQLException {
        if ("oracle".equals(this.dbType)) {
            this.isOracle = true;
            if (this.driver.getMajorVersion() < 10) {
                throw new SQLException("not support oracle driver " + this.driver.getMajorVersion() + "." + this.driver.getMinorVersion());
            }

            if (this.driver.getMajorVersion() == 10 && this.isUseOracleImplicitCache()) {
                this.getConnectProperties().setProperty("oracle.jdbc.FreeMemoryOnEnterImplicitCache", "true");
            }

            this.oracleValidationQueryCheck();
        } else if ("db2".equals(this.dbType)) {
            this.db2ValidationQueryCheck();
        } else if ("mysql".equals(this.dbType) || "com.mysql.cj.jdbc.Driver".equals(this.dbType)) {
            this.isMySql = true;
        }

        if (this.removeAbandoned) {
            LOG.warn("removeAbandoned is true, not use in production.");
        }

    }

        对代码debug后发现this.driver用的还是mysql的驱动，那么问题就很明显了，我的配置没有生效。询问了公司架构师，公司框架本身有一个默认的配置文件，配置文件中默认写了mysql的驱动，将它改成oracle的驱动类，重启就能正确加载了。