背景：
Unsupported major.minor version 52.0 是jdk的原因
java.lang.UnsupportedClassVersionError: com/mysql/jdbc/Driver確實因為mysql-connector-java這個jar包的版本和tomcat版本不兼容導致的。
1、jdk7+老版5.0驅動com/mysql/jdbc/Driver
2、jdk8+新版6.0驅動com/mysql/cj/jdbc/Driver
錯誤信息
Got unchecked and undeclared exception which called by 10.9.49.87. service: com.jd.jr.fintech.megrez.loan.core.api.preloan.facade.CrlCreditResultQueryFacade, method: queryCreditResult, exception: java.lang.UnsupportedClassVersionError: com/mysql/jdbc/Driver : Unsupported major.minor version 52.0 (unable to load class com.mysql.jdbc.Driver), dubbo version: 2.4.10.3-wy, current host: 10.9.49.87
java.lang.UnsupportedClassVersionError: com/mysql/jdbc/Driver : Unsupported major.minor version 52.0 (unable to load class com.mysql.jdbc.Driver)
定位過程：（要找到出錯的具體位置）
direct模塊有錯誤 其實是core模塊的錯誤
core模塊中的mysql-connector-java 配置版本過高造成的