25
四

Transient instances cant be deleted


最近研究了下google的app engine，在删除一个对象时，遇到了如题的异常。在网上找了下，大都是国外的家伙在论坛里讨论。看了好久，终于找到解决方案。

关键就是删除的对象一定是要通过PersistenceManager的getObjectById（）方法获取到的。（有谁知道原因的，告诉我一下）

如果还不清楚，看下面的代码：

PersistenceManager manager = Factory.get().getPersistenceManager();
manager.deletePersistent( manager.getObjectById( entity.getClass(),
entity.getId() ) );

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