The method addPackageFromDrl(Reader) is undefined for the type PackageBuilder
The method getPackage() is undefined for the type PackageBuilder
这两句意思是PackageBuilder这个类中没有定义 addPackageFromDrl(Reader) ,getPackage()方法
RuleBase cannot be resolved to a type
RuleBaseFactory cannot be resolved
WorkingMemory cannot be resolved to a type
这三句意思是RuleBase,RuleBaseFactory,WorkingMemory这三个类不能定义一个变量,结合你下面发得图中import 报错,应该是这几个类的路径不对,或者你的项目的build path配置出错了
PackageBuilder这个类中没有定义 addPackageFromDrl 方法
最好发下代码,才能更好的解决问题