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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