今天在用webpack打包文件时报错ERROR in ./src/img/head4.jpg 1:0Module parse failed: Unexpected character '�' (1:0)You may need an appropriate loader to handle this file type, currently no loaders are configured...

今天在写实验报告，遇到一个问题在开启服务器时报404手动输入地址后报500仔细看一下500页面的报错信息，发现了这个提示java.lang.IllegalStateException: Optional int parameter 'cno' is present but cannot be translated into a null value due to being declared as