ejb3。0中实体bean，一对多原代码。非常适用于刚刚接触ejb3。0的朋友，里边写的很详细。相信大家看了之后就能明白其实很简单-ejb3. 0 Entity bean, one-to-many original code. Just very applicable to contact ejb3. 0 friend wrote inside the very detailed. I believe we saw after we can understand actually very simple