On Tue, Jun 20, 2017 at 2:14 PM, Bwmat <[email protected]> wrote:
> Tried with 2.8.9, same problem, but, I had an idea...
>
> replacing the line
>>public pojo(@JsonProperty(index = 0) int x, @JsonProperty(index = 1) int y)
>
> with the line
>
>>public pojo(@JsonProperty(index = 0, value = "d") int x,
>> @JsonProperty(index = 1, value = "e") int y)
>
> made it work! Looks like there's a superfluous check in there somewhere. (I
> even got a 'duplicate name' error when I used 'd' for both of them, heh).
Ah. Its not superfluous actually, since although output is "as array",
logical properties still have names for internal processing, and
binding to/from properties. Or, perhaps another way to put this is
that as-array serialization is a later addition and does not remove
existing requirements for property naming.
Note too that you can alternatively use `@JsonPropertyOrder` instead
of index value.
But I guess use of index may be bit better for this use case, when
serializing as array.
-+ Tatu +-
>
>
> On Tuesday, June 20, 2017 at 2:05:58 PM UTC-7, Bwmat wrote:
>>
>> I get an exception when running the following program with 2.6.2:
>>
>> import java.io.IOException;
>>
>> import com.fasterxml.jackson.annotation.JsonCreator;
>> import com.fasterxml.jackson.annotation.JsonFormat;
>> import com.fasterxml.jackson.annotation.JsonProperty;
>> import com.fasterxml.jackson.core.JsonProcessingException;
>> import com.fasterxml.jackson.databind.ObjectMapper;
>>
>> public class test
>> {
>> @JsonFormat(shape = JsonFormat.Shape.ARRAY)
>> final static class pojo
>> {
>> private final int x;
>> private final int y;
>>
>> @JsonCreator
>> public pojo(@JsonProperty(index = 0) int x, @JsonProperty(index =
>> 1) int y)
>> {
>> this.x = x;
>> this.y = y;
>> }
>>
>> @Override
>> public String toString()
>> {
>> return String.format("(%d,%d)", x, y);
>> }
>> }
>>
>> public static void main(String[] args) throws JsonProcessingException,
>> IOException
>> {
>> ObjectMapper mapper = new ObjectMapper();
>>
>> pojo deserialized = mapper.reader(pojo.class).readValue("[1, 2]");
>>
>> System.out.println(deserialized);
>> }
>> }
>>
>>
>> The exception:
>> Exception in thread "main"
>> com.fasterxml.jackson.databind.JsonMappingException: Argument #0 of
>> constructor [constructor for test$pojo, annotations: {interface
>> com.fasterxml.jackson.annotation.JsonCreator=@com.fasterxml.jackson.annotation.JsonCreator(mode=DEFAULT)}]
>> has no property name annotation; must have name when multiple-parameter
>> constructor annotated as Creator
>> at
>> com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:269)
>> at
>> com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
>> at
>> com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
>> at
>> com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:461)
>> at
>> com.fasterxml.jackson.databind.ObjectReader._findRootDeserializer(ObjectReader.java:1749)
>> at
>> com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:1506)
>> at
>> com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1136)
>> at test.main(test.java:36)
>> Caused by: java.lang.IllegalArgumentException: Argument #0 of constructor
>> [constructor for test$pojo, annotations: {interface
>> com.fasterxml.jackson.annotation.JsonCreator=@com.fasterxml.jackson.annotation.JsonCreator(mode=DEFAULT)}]
>> has no property name annotation; must have name when multiple-parameter
>> constructor annotated as Creator
>> at
>> com.fasterxml.jackson.databind.deser.BasicDeserializerFactory._addDeserializerConstructors(BasicDeserializerFactory.java:512)
>> at
>> com.fasterxml.jackson.databind.deser.BasicDeserializerFactory._constructDefaultValueInstantiator(BasicDeserializerFactory.java:324)
>> at
>> com.fasterxml.jackson.databind.deser.BasicDeserializerFactory.findValueInstantiator(BasicDeserializerFactory.java:254)
>> at
>> com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.buildBeanDeserializer(BeanDeserializerFactory.java:222)
>> at
>> com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.createBeanDeserializer(BeanDeserializerFactory.java:142)
>> at
>> com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:403)
>> at
>> com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:352)
>> at
>> com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:264)
>> ... 7 more
>>
>>
>> When I remove the constructor, and move the @JsonProperty annotations
>> directly to the members, everything works. Is this expected?
>
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