Transaction silently rolled back because it has been marked as rollback-only

出现这个错误的原因是事务双重回滚了。
模块间的相互调用时，被调用的模块有事务提交，在报错之后事务回滚，返回错误信息，
调用模块收到被调用模块的错误信息再一次进行事务回滚。
解决方法：在调用模块方法上挂起事务，不回滚事务
@Transactional(propagation = Propagation.NOT_SUPPORTED )

查询数据后对entity进行修改，数据库对应字段会自动更新。
解决方法如下：

使用BeanUtils
new一个新实体，将查询出来的实体复制给新实体，修改之后返回新实体对象。
BeanUtils.copyProperties(entity,newEntity);
使用@Transactional注解
在Dao层对应方法使用该注解，表示以非事务方式执行操作，如果当前存在事务，就把当前事务挂起（只查询）。
@Transactional(propagation=Propagation.NOT_SUPPORTED)

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