有3个对象,对象A,对象B,对象C.他们的实体关系为: 1.A中存在List<B>和List<C>,即一个包含另外两个: 2.A中存在List<B>,B中存在List<C>,即传递关系: 存在上面2种情况,并且fetch=eager就会报上面的异常.解决办法: 方式1.将List改成Set; 方式2.将fetch改成lazy方式: 方式3.利用Hibernate注解:@IndexColumn 方式4.利用JPA的注解:@OrderColumn 上面方式3和4…

问题是什么时候出现的呢?    当一个实体对象中包含多于一个non-lazy获取策略时,比如@OneToMany,@ManyToMany或者@ElementCollection时,获取策略为(fetch = FetchType.EAGER) 出现问题的原因:    当(fetch = FetchType.EAGER)多余一个时,持久框架抓取一方的对象时,同时又将多方的对象加载进容器中,多方又可能关联其它对象,Hibernate实现的JPA,默认最高抓取深度含本身级为四级(它有个属性配置是0-3)…

警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'accountService': Injection of resource dependencies failed; nested exception…

docs.jboss.org文档示例代码:(http://docs.jboss.org/hibernate/annotations/3.5/reference/en/html_single/) static { try { sessionFactory = new AnnotationConfiguration() .configure().buildSessionFactory(); } catch (Throwable ex) { // Log exception! throw new Ex…

昨晚修改了一些表关系,在相关的hbm.xml文件中做了改动,今天早上起来启动tomcat后,发现项目启动不了,控制台报错: 2015-6-14 9:09:42 org.apache.catalina.core.StandardContext listenerStart 严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.Conte…

1.错误描述 Caused by:org.hibernate.HibernateException:Unable to make JDBC Connection[jdbc\:mysql\://localhost\:3306/school] 2.错误原因 在hibernate.cfg.xml中配置数据库路径时 <property name="connection.url"> jdbc\:mysql://localhost\:3306/school </property&…

1.错误描述 Caused by:org.hibernate.MappingNotFoundException:resouce:com/you/model/Monkey.hbm.xml not found 2.错误原因 由于在hibernate.cfg.xml中配置Monkey.hbm.xml路径时,Monkey.hbm.xml放置在src同一级,之前是放在com/you/model下,故路径错误 3.解决办法 将Monkey.hbm.xml放在com/you/model目录下…

1.错误描述 java.lang.ExceptionInInitializerError Caused by:org.hibernate.InvalidMappingException:Could not parse mapping document from resource com/you/model/Monkey.hbm.xml Caused by:org.hibernate.DuplicateMappingException:Duplicate class/entity/ mapping…

报错信息: ERROR Dispatcher:38 - Exception occurred during processing request: user is not mapped [from user where username = ?]; nested exception is org.hibernate.hql.ast.QuerySyntaxException: user is not mapped [from user where username = ?]org.springfr…

Caused by: org.hibernate.HibernateException: identifier of an instance of ... is alterde from     Hibernate的提示错误 Caused by: org.hibernate.HibernateException: identifier of an instance of .[类名]. is alterde from [数字] to [数字] 原因:是由于在一个事务中更新了主键,而主键是不能被更新…