com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: Too many connections
最简单的办法是因为你的my.ini中设定的并发连接数太少或者系统繁忙导致连接数被占满解决方式：打开MySQL安装目录打开MY.INI找到max_connections默认是100.--实例WINDOWS解决mysql Errno.:1040错误XXXXinfo:CannotconnecttoMySQLserv...
注解 javax.validation.constraints下的注解
@NotBlank,@NotNoll,@NotEmpty实体字段校验之间的区别简单的来说字符串用@NotBlank基本类型用@NotNoll集合类型@NotEmpty...
ORA-54531: invalid orientation for element at element offset
文档解释ORA-54531:invalidorientationforelementatelementoffsetCause:Theorientationofthecurrentgeometrywasnotvalid.Action:Reversetheorientationofthegeometry.ORA-54531...
ORA-48149: error encountered when attempting to copy a file
文档解释ORA-48149:errorencounteredwhenattemptingtocopyafileCause:TherewasanerrorencounteredwhenattemptingtocopyafilewiththeADRfileinterface.Action:Checkthedirectory...
ORA-41689: invalid collection specification in the rule condition
文档解释ORA-41689:invalidcollectionspecificationintheruleconditionCause:Anattemptwasmadetoinsertaruleconditionwithinvalidcollectionelementspecification.Action:Corre...
ORA-38810: Implementation restriction: cannot drop edition that has a parent and a child
文档解释ORA-38810:Implementationrestriction:cannotdropeditionthathasaparentandachildCause:Thiserroroccurredbecauseanattemptwasmadetodropaneditionthathasaparentandac...