Jackson serialization stops working after upgrade to 3.7.x from 3.6.x

[Steve Hu]

The following code calls values on IMap with a pagingPredicate. In 3.7.x, the values collection contains ResultSet object which cannot be serialised by Jackson writeValueAsString()

IMap<String, Service> services = CacheStartupHookProvider.hz.getMap("services");

Deque<String> serviceIdDeque = exchange.getQueryParameters().get("serviceId");
String serviceId = serviceIdDeque == null? "%" : serviceIdDeque.getFirst() + "%";
int page = Integer.valueOf(exchange.getQueryParameters().get("page").getFirst()) - 1;
Deque<String> pageSizeDeque = exchange.getQueryParameters().get("pageSize");
int pageSize = pageSizeDeque == null? 10 : Integer.valueOf(pageSizeDeque.getFirst());

LikePredicate likePredicate = new LikePredicate("serviceId", serviceId);

PagingPredicate pagingPredicate = new PagingPredicate(likePredicate, new ServiceComparator(), pageSize);
pagingPredicate.setPage(page);
Collection<Service> values = services.values(pagingPredicate);

exchange.getResponseHeaders().add(new HttpString("Content-Type"), "application/json");
exchange.getResponseSender().send(Config.getInstance().getMapper().writeValueAsString(values));

The error is 

com.fasterxml.jackson.databind.JsonMappingException: Class com.networknt.oauth.cache.model.Service not subtype of [simple type, class java.util.Map$Entry<java.lang.Object,java.lang.Object>] (through reference chain: com.hazelcast.replicatedmap.impl.record.ResultSet[0])

It looks like the object is just a reference which cannot be handled by Jackson. Is there any way we can convert

the result to POJO so that it can be serialized?

Thanks,

Steve

[Ahmet Mircik]

Hi, filed an issue for it: https://github.com/hazelcast/hazelcast/issues/11489

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