I think GWT-RPC uses the CustomSerializer for the HashMap (which calls put()
for each key/value pair) in addition to deserializing the ArrayList. The
custom-serializer will then call your put() methods which will add to the
list.
Marking the ArrayList 'transient' or @GwtTransient should be enough to fix
it (the list won't be serialized, but instead rebuilt by the put() calls
when the object is deserialized). You could also wrap a HashMap instead of
extending hashMap.
BTW, your code is lively buggy, as you unconditionnally add to the list,
without ever checking whether it already contains an entry for the key (i.e.
put("a", "b"); put("a", "c"); will give you ["a", "a"] in getData(), whereas
the Map only contains a single entry, for key "a")
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