CODEWITHSUNDEEP
javajsonobjectmapper
Roman_Kuznetcov1
Roman_Kuznetcov1

Reputation: 13

ObjectMapper converting array into set of Objects with one field

I have TestEntity class:

@Data
public class TestEntity {

    @NotEmpty(message = "strings are required")
    private Set<InnerTestEntity> strings;

}

Also I have InnerTestEntity:

@Data
public class InnerTestEntity {

    @NotEmpty(message = "name is required")
    private String name;

}

And I have JSON file:

{
  "strings" : [
    "name1",
    "name2",
    "name3"
  ]
}

The idea is to map each name from Strings into InnerTestEntity objects to "name" field, and have TestEntity object with this set of InnerTestEntity objects.

When I call this:

TestEntity test = objectMapper.readValue(*Path to JSON*, new TypeReference<>() {
        });

It gives me this error:

Cannot construct instance of ...InnerTestEntity (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('name1')

What is the option to map it properly?

Upvotes: 1

Views: 614

Answers (1)

Michael Gantman
Michael Gantman

Reputation: 7790

In your class InnerTestEntity use @JsonValue annotation:

@Data
public class InnerTestEntity {

    @NotEmpty(message = "name is required")
    @JsonValue //This is the added line
    private String name;

}

See Javadoc for @JsonValue

Upvotes: 1

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