问题：Build path contains duplicate entry:''D:soft/Myeclipse 6.5/jre/lib/rt.jar' for project 'dataService_gzq'。

原因：rt.jar包重复

解决问题 ：右击项目-》Build Path ->Configure Build Path ……-》Libraries->选中JRE System Library [J2SE-1.5](注：rt.jar在JRE System Library [J2SE-1.5]中)——》Remove