删除的时候前台显示这个错：

type Exception report

message attempt to create delete event with null entity

description The server encountered an internal error that prevented it from fulfilling this request.

后台提示这个错：ERROR - Exception occurred during processing request: attempt to create delete event with null entity

java.lang.IllegalArgumentException: attempt to create delete event with null entity

更新的时候提示这个错：

type Exception report

message Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1; nested exception is org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.orm.hibernate3.HibernateOptimisticLockingFailureException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1; nested exception is org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1