[FIXED] Spring boot camel unmarshal json list of objects that have ZonedDateTime field

Issue

I have 2 different camel routes.

1)

from(...).routeId(...)
  .unmarshal().json(SomeClass.class)
  ....;

And 2)

from(...).routeId(...)
  .unmarshal(new ListJacksonDataFormat(SomeOtherClass.class))
  ....;

Both SomeClass and SomeOtherClass have field named timestamp whose type is java.time.ZonedDateTime.

In first route I pass single object and it unmarshals without errors. In 2nd route I pass a list of objects and it does not work:

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Java 8 date/time type java.time.ZonedDateTime not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling

Questions:

1. Do I correctly understand that if I want to unmarshal list I need to use .unmarshal(new ListJacksonDataFormat(...)) instead of .unmarshal().json(...)?
2. Do I really need to add Module com.fasterxml.jackson.datatype:jackson-datatype-jsr310? Otherwise I would have added it without even asking here but since my first route can manage ZonedDateTime just fine I wanted to be sure that I really have to add a new module or if there are any other means of dealing with it? It's strange that first route can unmarshal ZonedDateTime fine and 2nd can't.

After .unmarshal(...) I plan to call .bean(..., "method") where method takes List as argument. Not sure if this extra info is needed but added it just in case.

Solution

The likely issue is that in the first example the actual json which you are trying to unmarshal does not include a timestamp so jackson will not try to unmarshal a field of type java.time.ZonedDateTime.

If it is your intention that the object be unmarshalled with the timestamp field populated you should add com.fasterxml.jackson.datatype:jackson-datatype-jsr310 to your project.

Answered By - Ben Borchard
Answer Checked By - Pedro (JavaFixing Volunteer)