The EJB specification states that the key must be a unique value represented by a serializable object.

EJB规范规定：主键必须是一个可序列化的对象所表示的独一无二的值。

youdao

Custom token object, for the lack of a better name, is really just a regular serializable object.

自定义令牌对象(因为没有更合适的名称)实际上是一个常规的可序列化对象。

youdao

Since the context object needs to be passed across components, the object should be serializable.

因为需要跨组件传递上下文对象，所以这个对象应该是可序列化的。

youdao