spi-subtypes

jackson-module-spi-subtypes

Registering subtypes without annotating the parent class, see this.

Implementation on SPI.

Usage

Registering modules.

ObjectMapper mapper = JsonMapper.builder()
    .addModule(new SubtypesModule())
    .build();

Ensure that the parent class has at least the JsonTypeInfo annotation.

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
public interface Parent {
}

1. add the JacksonSubType annotation to your subclass.
2. provide a non-argument constructor (SPI requires it).

package org.example;

import tools.jackson.module.spisubtypes.JacksonSubType;

@JacksonSubType("first-child")
public class FirstChild {

    private String foo;
    // ...

    public FirstChild() {
    }
}

SPI: Put the subclasses in the META-INF/services directory under the interface. Example: META-INF/services/org.example.Parent

org.example.FirstChild

Alternatively, you can also use the auto-service to auto-generate these files:

package org.example;

import tools.jackson.module.spisubtypes.JacksonSubType;
import com.google.auto.service.AutoService;

@AutoService(Parent.class)
@JacksonSubType("first-child")
public class FirstChild {

    private String foo;
    // ...

    public FirstChild() {
    }
}

Done, enjoy it.