Empty ImmutableMap Objects Are Not Deserialized Correctly by GuavaMapDeserializer.java

[pbergn]

The GuavaMapDeserializer#deserialize() method does not correctly deserialize empty ImmutableMap object instances when they are nested as bean properties and have a "@Class" identifier as the first key/value pair in the enclosing curly braces. Note that "empty" implies that there are no additional key/value pairs after the class identifier in question, which results in parsing error.

More specifically, the parsing issue stems from the check on line 120 where, JsonToken.END_OBJECT is NOT considered as a legitimate first token, and a run-time exception is raised. Note that the regular MapDeserializer class DOES permit the END_OBJECT token as a legitimate first token.

[cowtowncoder]

Thanks. I will try to reproduce the problem, should be easy enough to fix.

[cowtowncoder]

Looks like polymorphic type info is indeed needed; plain old "{ }" does not cause problems in itself.

[cowtowncoder]

Ok, finally able to reproduce this.

[cowtowncoder]

Fixed, will be included in 2.3.0.

Thank you for reporting this issue: I also checked that ImmutableSet should work; let us know if you find other problem cases.