struts2：2.3.20
spring：4.1.5
hibernate：4.3.8
用户与订单一对多的关系，数据库中订单表有用户这个外键。在用户映射文件中已设置cascade="delete"
项目启动无错误，在后台管理用户页面删除用户时报如下错误：
16:35:30,957 WARN SqlExceptionHelper:144 - SQL Error: 1451, SQLState: 23000
16:35:30,959 ERROR SqlExceptionHelper:146 - Cannot delete or update a parent row: a foreign key constraint fails (mall.orderitem, CONSTRAINT FK_hth7ctygtqa5ov7kutghwa1ni FOREIGN KEY (uid) REFERENCES orders (oid))
16:35:30,961 INFO AbstractBatchImpl:208 - HHH000010: On release of batch it still contained JDBC statements
16:35:31,165 ERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing request: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.springframework.orm.hibernate4.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:163)
at org.springframework.orm.hibernate4.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:730)
at org.springframework.orm.hibernate4.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:592)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:757)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:726)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:521)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:291)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)
at com.lonini.mall.user.service.UserService$$EnhancerBySpringCGLIB$$3596b2ab.deleteUser()
at com.lonini.mall.user.adminaction.UserAdminAction.delete(UserAdminAction.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
......
Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:129)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:211)
......
Caused by: com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (mall.orderitem, CONSTRAINT FK_hth7ctygtqa5ov7kutghwa1ni FOREIGN KEY (uid) REFERENCES orders (oid))
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:931)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3283)
......
order实体：
order关系映射：
user实体：
user关系映射：
删除用户的JSP页面：
删除用户的action方法：
删除用户的Service层:
删除用户的Dao层:
删除用户的struts2配置:
删除用户的spring配置(action):
