第一次安裝Spring Tool Suite，剛構(gòu)建完畢，就報(bào)此錯(cuò)誤。不知道怎么回事，請幫忙看看吧。?報(bào)錯(cuò)內(nèi)容：Exception in thread "main" java.lang.Error: Unresolved compilation problem:String cannot be resolved to a type