org.hibernate.type.IntegerType.next NullPointerException
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最近使用hibernate的SSH整合的时候,出现了上面的错误,但是发现
错误是报在:
List set = roleAndResourcesService.getRoleAndResourcesByAdminRoleId(entity.getId());
说是出现了空指针,但是在单元测试类中传入一样的参数,单单调用这个方法就不会报错,当时脑子乱了,没有往上面去想,最后想来想去,不断的移除,才发现是因为自己先执行了update(entity)方法,但是这个方法没有立即执行(没有发送update语句),而是接着执行了:entity = getById(entity.getId());,发了一条SQL,然后执行List set = roleAndResourcesService.getRoleAndResourcesByAdminRoleId(entity.getId());,的时候就报错了:
是因为它有个计划执行,然后想取的时候就报错了,根本原因是因为传入的entity对象是页面传递过来的,不是从数据库中查出来的,所以就报错了,但是错误信息是在执行:roleAndResourcesService.getRoleAndResourcesByAdminRoleId(entity.getId());的时候才想发送sql,所以就出错了
根本原因还是Hibernate的状态转移问题
roleAndResourcesService.getRoleAndResourcesByAdminRoleId(entity.getId());
@Override public AdminRole updateAdminRoleAndItsResource(AdminRole entity, String[] SysResourcesIds) { update(entity); entity = getById(entity.getId()); List<RoleAndResources> set = roleAndResourcesService.getRoleAndResourcesByAdminRoleId(entity.getId()); for (RoleAndResources roleAndResources : set) { roleAndResourcesService.delete(roleAndResources); } if (SysResourcesIds != null && SysResourcesIds.length > 0) { for (String sysRes : SysResourcesIds) { RoleAndResources rar = new RoleAndResources(); rar.setAdminRole(entity); SysResources sysResources = sysResourcesService.getById(Long .valueOf(sysRes)); rar.setSysResources(sysResources); roleAndResourcesService.add(rar); } } return entity; }
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