There is a bug for this issue on the issue tracker I believe. Our app
tried to send a HashMap from server to client and was unable to.
Although the GWT 1.5 list of Java types supported for serialization
lists HashMap, it's not true.

On Dec 16, 6:28 am, Amit <[email protected]> wrote:
> In my case, the HashMap is of the type HashMap<String, String[]>. So,
> all the objects are serializable. Also, it worked in GWT 1.4.
>
> Regards,
> Amit
>
> On Dec 15, 10:14 am, gwtGrady <[email protected]> wrote:
>
> > Is it possible you have a non-serializable object in your collection
> > that is causing this error?
>
> > On Dec 15, 6:17 am,Amit<[email protected]> wrote:
>
> > > I am porting an existing code from GWT 1.4 to GWT 1.5. The code is
> > > sending aHashMap[] (array) object between the client and the server
> > > with GWT-RPC. This worked with GWT 1.4 but after the port, the RPC
> > > call fails with a server-side security exception stating thatHashMap
> > > [] is not serializable as per the security policy. It is interesting
> > > because aHashMapobject, itself, is serializable and there are a
> > > number of places in the code where we are serializing aHashMapobject
> > > successfully using GWT 1.5 and GWT 1.4.
>
> > > Not sure if this is a bug or not but I thought I would want to bring
> > > it to your attention.
>
> > > Regards
> > >AmitChatterjee
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