Serializing an Iterator with multiple sub-types fails after upgrading to 2.9.x #1977
Description
Hello,
I recently upgraded my jackson version 2.8.7 to 2.9.4 and serialization of an iterator with multiple sub-types seems broken.
Code to recreate the issue:
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.ArrayList;
import java.util.Iterator;
public class JacksonErrorTest {
private static Iterator<Number> numbers;
private static final ObjectMapper MAPPER = new ObjectMapper();
public static void main(String[] args) throws Exception {
ArrayList<Number> numbersList = new ArrayList<>();
numbersList.add(1);
numbersList.add(1.0);
numbers = numbersList.iterator();
MAPPER.writeValueAsString(numbers);
}
}
The exception stack trace is:
Exception in thread "main" com.fasterxml.jackson.databind.JsonMappingException: java.lang.Double cannot be cast to java.lang.Integer
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._wrapAsIOE(DefaultSerializerProvider.java:509)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:482)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)
at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3893)
at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:3207)
at JacksonErrorTest.main(JacksonErrorTest.java:21)
Caused by: java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer
at com.fasterxml.jackson.databind.ser.std.NumberSerializers$IntegerSerializer.serialize(NumberSerializers.java:137)
at com.fasterxml.jackson.databind.ser.impl.IteratorSerializer._serializeDynamicContents(IteratorSerializer.java:120)
at com.fasterxml.jackson.databind.ser.impl.IteratorSerializer.serializeContents(IteratorSerializer.java:80)
at com.fasterxml.jackson.databind.ser.impl.IteratorSerializer.serialize(IteratorSerializer.java:67)
at com.fasterxml.jackson.databind.ser.impl.IteratorSerializer.serialize(IteratorSerializer.java:13)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)
... 4 more
It looks like the error is on this line:
https://github.com/FasterXML/jackson-databind/blob/master/src/main/java/com/fasterxml/jackson/databind/ser/impl/IteratorSerializer.java#L109
serializers.serializerFor(cc);
should be
serializer = serializers.serializerFor(cc);