I currently have a project which uses jackson faster xml to serialize/deserialize POJOs to Json using custom serializers and deserializers. From what I understand, the ObjectMapper is thread-safe once it has been created and configured. However, I have noticed when running tests with JMeter that occasionally the following can happen -
It seems to be that the JsonGenerator instance is being reset when the second thread has entered - surely this shouldn't be happening? I have checked several sites and threads to see if there are any settings or features I need to set, but from what I understand the ObjectMapper reuses JsonGenerator instances, could this be the issue?
The following is a snippet from my custom serializer...
@Override
public final void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
jsonGenerator.writeStartObject();
... Code here ....
jsonGenerator.writeEndObject();
closeJsonGenerator(jsonGenerator);
}
And an example of where it is used
SimpleModule sm = new SimpleModule();
sm.addSerializer(new myCustomSerializer());
new ObjectMapper().registerModule(sm)
.writeValue(new myObject());
Jackson's ObjectMapper
creates a new JsonGenerator
on each request for serialization. In that sense, it is guaranteed to be thread safe. The only thing that I can see that might cause the behavior you are seeing is if your CustomSerializer
has some instance fields that it is sharing and is doing some kind of internal synchronization.
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