An exception occurred when deserialize the ArrayList$SubList object.

[guopengdreams]

We're using Jackson 2.13.4 and jdk 1.8

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import com.fasterxml.jackson.module.noctordeser.NoCtorDeserModule;

import java.util.ArrayList;
import java.util.List;

public class JacksonTest2_2 {
    static final ObjectMapper objectMapper = new ObjectMapper();

    public static void main(final String[] args) {
        try {
            objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
            objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE);
            objectMapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
            objectMapper.setVisibility(PropertyAccessor.CREATOR, JsonAutoDetect.Visibility.ANY);
            objectMapper.registerModule(new NoCtorDeserModule());
            objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY); 

            List<String> list = new ArrayList<>();
            list.add("001464");
            list.add("002332");
            list.add("002875");
            list.add("003309");
            list.add("004625");
            JsonNode jsonNode = objectMapper.convertValue(list.subList(0, 2), JsonNode.class);
            System.out.println(jsonNode.toString());
            Object o = objectMapper.readValue(jsonNode.toString(), Object.class);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

Exception information

["java.util.ArrayList$SubList",["001464","002332"]]
Exception in thread "main" java.lang.RuntimeException: java.lang.NullPointerException
	at com.alibaba.dubbo.demo.provider.JacksonTest2_2.main(JacksonTest2_2.java:41)
Caused by: java.lang.NullPointerException
	at java.util.ArrayList$SubList.checkForComodification(ArrayList.java:1238)
	at java.util.ArrayList$SubList.size(ArrayList.java:1048)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer._deserializeFromArray(CollectionDeserializer.java:371)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:272)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:28)
	at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:92)
	at com.fasterxml.jackson.module.noctordeser.MissingInstantiatorHandler.handleMissingInstantiator(MissingInstantiatorHandler.java:36)
	at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1320)
	at com.fasterxml.jackson.databind.deser.ValueInstantiator.createUsingDefault(ValueInstantiator.java:248)
	at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createUsingDefault(StdValueInstantiator.java:275)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.createDefaultInstance(CollectionDeserializer.java:262)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:244)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:28)
	at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer._deserialize(AsArrayTypeDeserializer.java:120)
	at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer.deserializeTypedFromArray(AsArrayTypeDeserializer.java:53)
	at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromAny(AsPropertyTypeDeserializer.java:211)
	at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deserializeWithType(UntypedObjectDeserializer.java:781)
	at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:74)
	at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:323)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4674)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3629)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3597)
	at com.alibaba.dubbo.demo.provider.JacksonTest2_2.main(JacksonTest2_2.java:39)

[pjfanning]

I tried this with the latest code in the default branch (2.19) and saw no issues. 2.13.4 is old and no longer suppported.
The latest release is 2.18.1.

[guopengdreams]

The problem exists after verifying with version 2.18.1, the location of the error has changed.

["java.util.ArrayList$SubList",["001464","002332"]]
Exception in thread "main" java.lang.RuntimeException: java.lang.NullPointerException
	at com.alibaba.dubbo.demo.provider.JacksonTest2_2.main(JacksonTest2_2.java:40)
Caused by: java.lang.NullPointerException
	at java.util.ArrayList$SubList.checkForComodification(ArrayList.java:1238)
	at java.util.ArrayList$SubList.size(ArrayList.java:1048)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer._deserializeFromArray(CollectionDeserializer.java:381)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:274)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:30)
	at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:92)
	at com.fasterxml.jackson.module.noctordeser.MissingInstantiatorHandler.handleMissingInstantiator(MissingInstantiatorHandler.java:36)
	at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1346)
	at com.fasterxml.jackson.databind.deser.ValueInstantiator.createUsingDefault(ValueInstantiator.java:248)
	at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createUsingDefault(StdValueInstantiator.java:275)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.createDefaultInstance(CollectionDeserializer.java:264)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:246)
	at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:30)
	at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer._deserialize(AsArrayTypeDeserializer.java:123)
	at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer.deserializeTypedFromArray(AsArrayTypeDeserializer.java:56)
	at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromAny(AsPropertyTypeDeserializer.java:238)
	at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializerNR.deserializeWithType(UntypedObjectDeserializerNR.java:112)
	at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:74)
	at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:342)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4917)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3860)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3828)
	at com.alibaba.dubbo.demo.provider.JacksonTest2_2.main(JacksonTest2_2.java:38)

[pjfanning]

I would suggest that you contact your JDK provider as this seems quite possibly to be a bug in your JDK. I cannot reproduce this. I tried recent Temurin Java 11 and 8 builds.

[cowtowncoder]

Also, going forward, these would be better reported as issues, instead of Discussions.