5 回答Exception 強(qiáng)轉(zhuǎn) BusinessException 不成功 java.lang.ClassCastException: java.lang.NullPointerException cannot be cast to com.dmsc.error.BusinessException at com.dmsc.conrtoller.UserConrtoller.handlerException(UserConrtoller.java:46) ~[classes/:na]

1 回答請教各位，3.1節(jié)項目啟動報錯：Description: Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured. Reason: Failed to determine a suitable driver class

1 回答itemDO.imgurl = Cannot find local variable 'itemDO' 和 Error creating bean with name 'app'……

3 回答執(zhí)行報錯Resolved [javax.validation.UnexpectedTypeException

1 回答APPLICATION FAILED TO START