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MismatchedInputException: @JsonCreator ignored with ParameterNamesModule and Getter

See original GitHub issue

Similar to #1318 and #1924 but (perhaps significantly?) different reproduction method.

Tested on 2.9.1 and 2.9.6 (currently latest). Works without ParameterNamesModule registered (or if compiled without -parameters, of course!)

import java.util.UUID;

public class JsonCreatorTest
{
  @Test
  public void deleteMe() throws Exception
  {
    new ObjectMapper()
        .registerModule(new ParameterNamesModule())
        .readValue("\"6994179a-11ff-4fdd-969c-bc977b50332d\"", UuidWrapper.class);
  }

  public static class UuidWrapper
  {
    private final UUID val;

    public UUID getVal()
    {
      return val;
    }

    private UuidWrapper(UUID val)
    {
      this.val = val;
    }

    @JsonCreator
    public static UuidWrapper valueOf(String val)
    {
      return new UuidWrapper(UUID.fromString(val));
    }
  }
}

Causes:

com.fasterxml.jackson.databind.exc.MismatchedInputException: 
Cannot construct instance of `foo.JsonCreatorTest$UuidWrapper` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('6994179a-11ff-4fdd-969c-bc977b50332d')
 at [Source: (String)""6994179a-11ff-4fdd-969c-bc977b50332d""; line: 1, column: 1]
	at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63)
	at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1342)
	at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1031)
	at com.fasterxml.jackson.databind.deser.ValueInstantiator._createFromStringFallbacks(ValueInstantiator.java:371)
	at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createFromString(StdValueInstantiator.java:323)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromString(BeanDeserializerBase.java:1373)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:171)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:161)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3004)

Issue Analytics

State:
Created 5 years ago
Comments:8 (5 by maintainers)

Top GitHub Comments

1reaction

cowtowncodercommented, Aug 16, 2018

@xathien Unfortunately as I said, I don’t think there is an easy fix here. Case of 1-arg constructor or factory has to be resolved by some explicit configuration. I would go with mode = DELEGATING, and that definitely should work, regardless of parameter names. If not, I would want to fix that part.

1reaction

cowtowncodercommented, Aug 15, 2018

Thank you for reporting this, and especially for providing reproduction. I will try to modify it so it can be tested without parameter names module, with mock parameter name provider.

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