Question

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

org.hibernate.event.SaveOrUpdateEvent.<init>(SaveOrUpdateEvent.java:40)
org.hibernate.event.SaveOrUpdateEvent.<init>(SaveOrUpdateEvent.java:23)
org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:693)
org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:419)
org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:690)
com.room.dao.impl.Graduation_daoImpl.addGraduation(Graduation_daoImpl.java:19)
com.room.service.impl.Graduation_serviceImpl.addGrad(Graduation_serviceImpl.java:27)
com.room.action.Graduation_addnewGrad.execute(Graduation_addnewGrad.java:26)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:440)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:279)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:163)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:249)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)

点击添加的时候跳出来的 是什么问题啊？
数据能查出来 就是添加和删除的时候跳这个异常

Answer 1

你在使用SaveOrUpdate方法的时候应该传一个实体类的对象，你是不是那个对象是空的啊
建议 在执行存储前先控制台打印一遍实体对象，看看是否存在

Answer 2

显然要插入的对象没有传过来

Answer 3

打下log，看下你要添加的数据是不是正确地传递进来了。