文章浏览阅读2.1w次,点赞4次,收藏20次。报错信息如下例:Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null objectAttempt to invoke virtual method 'java.lang.Object android.content.Context.getSystemService(java.lang.String)' on a null obje......
文章浏览阅读2.1w次,点赞4次,收藏20次。报错信息如下例:Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null objectAttempt to invoke virtual method 'java.lang.Object android.content.Context.getSystemService(java.lang.String)' on a null obje......
文章浏览阅读2.6k次。场景Java + mybatis + mysql ,前端调用接口传 表情符:《???? ????》,后端进行insert/update 抛出以下异常异常信息如下:Creating a new SqlSessionSqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@7187ae57] was not registered for ......