Jackson 2.7.1 and Lombok: 'Conflicting/ambiguous property name definitions'

(move from https://github.com/FasterXML/jackson/issues/51 reported by @cnsgithub)

Hi,

Since I’ve updated to Jackson 2.7.1 mapping of some JSON strings to objects gives me this exception:

Exception in thread "main" java.lang.IllegalStateException: Conflicting/ambiguous property name definitions (implicit name 'foo'): found multiple explicit names: [bar, foo], but also implicit accessor: [method Ambiguity#getFoo(0 params)][visible=true,ignore=false,explicitName=false]
    at com.fasterxml.jackson.databind.introspect.POJOPropertyBuilder._explode(POJOPropertyBuilder.java:913)
    at com.fasterxml.jackson.databind.introspect.POJOPropertyBuilder.explode(POJOPropertyBuilder.java:893)
    at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector._renameProperties(POJOPropertiesCollector.java:748)
    at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.collectAll(POJOPropertiesCollector.java:301)
    at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.getPropertyMap(POJOPropertiesCollector.java:248)
    at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.getProperties(POJOPropertiesCollector.java:155)
    at com.fasterxml.jackson.databind.introspect.BasicBeanDescription._properties(BasicBeanDescription.java:142)
    at com.fasterxml.jackson.databind.introspect.BasicBeanDescription.findProperties(BasicBeanDescription.java:217)
    at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory._findCreatorsFromProperties(BasicDeserializerFactory.java:330)
    at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory._constructDefaultValueInstantiator(BasicDeserializerFactory.java:312)
    at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory.findValueInstantiator(BasicDeserializerFactory.java:252)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.buildBeanDeserializer(BeanDeserializerFactory.java:221)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.createBeanDeserializer(BeanDeserializerFactory.java:143)
    at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:406)
    at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:352)
    at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:264)
    at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
    at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
    at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:477)
    at com.fasterxml.jackson.databind.ObjectMapper._findRootDeserializer(ObjectMapper.java:3889)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3784)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2779)
    at TestAmbiguity.main(TestAmbiguity.java:12)

I just realized that the exception occurs only when used together with Lomboks @AllArgsConstructor annotation which adds a @ConstructorProperties annotation to the constructor…

JSON entity:

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;

@JsonIgnoreProperties(ignoreUnknown = true)
//not working
//@AllArgsConstructor
public class Ambiguity {

    @JsonProperty("bar")
    private int foo;

    protected Ambiguity() {}

    //not working (generated by lombok)
    //@java.beans.ConstructorProperties(value = { "foo" })
    //working
    public Ambiguity(int foo) {
        this.foo = foo;
    }

    public int getFoo() {
        return foo;
    }

    @Override
    public String toString() {
        return "Ambiguity [foo=" + foo + "]";
    }

}

Test:

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class TestAmbiguity {

    public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
        String json = "{\"bar\":0}";
        ObjectMapper mapper = new ObjectMapper();
        System.out.println(mapper.readValue(json, Ambiguity.class));
    }

}

Workaround to solve this are either switching back to Jackson 2.6.5 or not using Lombok annotation.

[cowtowncoder]

(from original issue)

Using project jackson-lombok (https://github.com/xebia/jackson-lombok) also works with Jackson 2.7.1, although it should be obsolete, it helps out in this case:

ObjectMapper mapper = new ObjectMapper();
mapper.setAnnotationIntrospector(new JacksonLombokAnnotationIntrospector());

[cowtowncoder]

@cnsgithub within next couple of days.