failed to lazily initialize a collection of role异常解决
2018-02-24 23:12
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最近在通过配置实体类的方式,正向自动扫描注解方式配置的hibernate类文件来生成数据库的方法搭建环境,遇到了许多问题。通过数据库配置hibernate的时候,大家都知道是在实体类对应生成的.hbm.xml文件中查看一对多和多对多的关系。当报failed to lazily initialize a collection of role异常的时候,往往是因为懒加载的问题导致的。可以在.hbm.xml文件中,将lazy="false",这样就不会报这个异常了。但是在自动扫描注解方式配置的hibernate类文件时,如何将懒加载改为false呢?只需要一句话,在注解上添加fetch=FetchType.EAGER便可,例如@ManyToMany(mappedBy = "couriers",fetch=FetchType.EAGER)
private Set<FixedArea> fixedAreas = new HashSet<FixedArea>();
private Set<FixedArea> fixedAreas = new HashSet<FixedArea>();
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