Questions tagged [jackson-module-scala]
18 questions
10
votes
1 answer
jackson why do I need JsonTypeName annotation on subclasses
At this link
I'm trying to understand why do I (may) need @JsonTypeName on subclasses (like all 'internet; sujests to put) if it works without it ?
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "aType")
@JsonSubTypes(Array(
new Type(value =…
ses
- 13,174
- 31
- 123
- 226
5
votes
2 answers
Did I just break JVM type safety by using Jackson JSON deserialisation?
This is what I got:
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.module.scala.DefaultScalaModuleobject
AppStart extends App {
val mapper = new ObjectMapper()
mapper.registerModule(DefaultScalaModule)
val…
brunedito
- 53
- 3
5
votes
0 answers
deserializing mongo document's DateField into java.util.Date
I'm using mongo-scala combination in one of my new projects and it requires deserializing a mongo document with date field
mongo document example
{
"_id" : ObjectId("56603577616e082f559da3d9"),
"type" : "rule",
"startTime" :…
Rohit
- 1,878
- 19
- 26
2
votes
1 answer
Scala Enum Serialization Fails using Jackson when DefaultTyping is enabled
I see that the Jackson library is failing to serialize Scala enums, when the DefaultTyping is enabled with OBJECT_AND_NON_CONCRETE setting. Please note that the serialization works fine when I use JAVA_LANG_OBJECT setting.
I am seeing the below…
Varun
- 73
- 8
2
votes
1 answer
Scala: How to prevent Jackson from deserialization with null
Say I have a case case such as:
case class Stuff(name:String,stuffs:List[String] = List.empty)
How can I prevent jackson from deserialization the json
{
"name":"Alex"
}
With
Stuff("Alex",null)
I would prefer it to be constructed with…
aclowkay
- 3,577
- 5
- 35
- 66
2
votes
2 answers
Using Scala Jackson for JSON deserialization?
I am new to scala and trying to map my json to an object. I have found jackson-scala-module but unable to figure out how to use it. A small example might be of help.
val json = { "_id" : "jzcyluvhqilqrocq" , "DP-Name" : "Sumit Agarwal" , "DP-Age" :…
Sumit Agarwal
- 4,091
- 8
- 33
- 49
2
votes
1 answer
Jackson / Scala immutable case classes: parsing a class depending on other value in JSON
I have a JSON like this:
{
"switch": "foo",
"items": [
{"type": "one"},
{"type": "two"}
]
}
I want to load it into a structure of classes like that:
case class MyFile(
@JsonProperty("switch") _switch: String,
…
GreyCat
- 16,622
- 18
- 74
- 112
1
vote
1 answer
Scala classOf generic type in Kafka json deserializer
I'm writing a kafka json deserializer in scala using Jackson but am having a problem providing jackson's readValue() method the class of a generic type. For example:
...
import org.apache.kafka.common.serialization.Deserializer
class…
novon
- 973
- 3
- 15
- 30
1
vote
0 answers
Deserializing generic list of objects to the right type with Jackson
My json string has an array at the top level. E.g.:
[
{...},
{...}
]
And I'm using jackson to deserialize it like so:
val parser = mapper.getFactory.createParser(json)
val mylist = mapper.readValue(parser, classOf[List[Track]])
The trouble is…
Filipe Correia
- 5,415
- 6
- 32
- 47
0
votes
0 answers
Exception: Scala module 2.14.1 requires Jackson Databind version >= 2.14.0 and < 2.15.0 - Found jackson-databind version 2.13.2-1
I am getting the exception " Scala module 2.14.1 requires Jackson Databind version >= 2.14.0 and < 2.15.0 - Found jackson-databind version 2.13.2-1" even though I have upgraded the Jackson Databind version tp 2.14.1 in the build.gardle file? How to…
Niharika Baruah
- 11
- 1
0
votes
1 answer
Jackson annotation mixin on some of the fields doesn't work
Preface
I'd like to deserialize json to the following class
case class Target(
a: Option[Long],
b: String
)
with the following code:
val mapper = new ObjectMapper()
.registerModule(DefaultScalaModule)
val req =
"""{
| "a":…
lev
- 3,986
- 4
- 33
- 46
0
votes
1 answer
Stop jackson-scala-module serializing all fields by default
Using DefaultObjectMapper from jackson-scala-module, in the following examples, field is serialised in the Scala version, but not in the Java version. Setting com.fasterxml.jackson.databind.MapperFeature.AUTO_DETECT_FIELDS has no effect.
I wish for…
oal
- 411
- 5
- 15
0
votes
2 answers
Jackson: (de)serialising Map with arbitrary non-string key
I have a Scala Map keyed by a type that itself needs serialising to JSON. Because of the nature of JSON that requires key names for objects to be strings, a simple mapping is not directly possible.
The work around I wish to implement is to convert…
oal
- 411
- 5
- 15
0
votes
0 answers
Deserialize map of Int to Tuple using Jackson
I have a class that looks something like
case class A (id: Int, name: String, marks: Map[Int, List(Long, Long)])
I am using Jackson to serialize and store the objects in a database and read them back.
However, when I deserialize it the Map is…
harshvardhan.agr
- 165
- 1
- 12
0
votes
0 answers
Option type information lost when deserializing JSON into Map[String, Option[String]]
val mapper = new ObjectMapper
mapper.registerModule(DefaultScalaModule)
val original: Map[String, Option[String]] = Map[String, Option[String]]("key" -> Some("value"))
val json: ObjectNode = new ObjectNode(JsonNodeFactory.instance).put("key",…
Grega Kešpret
- 11,827
- 6
- 39
- 44