Thanks. I will follow the DTO way. It seems more safe for coding.
2012/8/15 Jens <[email protected]>
> I guess the reason is that you return a raw Map. A raw Map means Map<?
> extends Object, ? extends Object> and GWT now has to check all possible sub
> classes of Object (= all classes) to see if they can be safely serialized.
> GWT then finds the serializable class PathImpl on the classpath and
> complaints about a final List variable inside that class (GWT-RPC can't
> serialize final fields yet I think).
> Also because you have used Map/List GWT has to generate JavaScript code to
> support serializing all implementation classes of Map/List even if you
> never use them.
>
> When you use GWT-RPC there is a rule very different from what you know
> from Java: Be as explicit as possible *(as long as it makes sense)* while
> defining your GWT-RPC methods. So instead of a raw Map use a parametrized
> HashMap or TreeMap. In your example its probably best to create a DTO
> class, e.g.
>
> class MyResult implements Serializable {
> ArrayList<Post> posts;
> TreeMap<Integer, User> users;
> }
>
> Now GWT will only validate MyResult, ArrayList, TreeMap, Integer, Post and
> User instead of every class on the classpath and the warning should
> disappear. Also only JS serialization code for ArrayList and TreeMap will
> be generated instead of code for all List and Map implementations. Being
> explicit only counts on GWT-RPC, so for everything else in your app you
> should use Map/List/Set.
>
> If your app grows and you plan to have RPC methods with all kinds of
> List/Map/Set implementations then you can of course use the Map/List/Set
> interface (because then you need serialization code for every
> implementation anyways) but you should still parametrize them.
>
> -- J.
>
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--
Gong Min
[email protected]
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