FasterXML schema generation for Maps and Object references

I have an issue generating a JSON Schema file with FasterXML. The file output just shows

  • object type for a Map<String, String>
  • null type for OtherBean

{ "type": "object", "properties": { "beanId": { "type": "integer" }, "beanName": { "type": "string" }, "beanMap": { "type": "object" }, "otherBean": null } }

My Schema generation class


import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsonschema.JsonSchema;

public class Main {

    public static void main(String[] args) throws IOException {

        ObjectMapper MAPPER = new ObjectMapper();

        JsonSchema jsonSchema = MAPPER.generateJsonSchema(MyBean.class);

        MAPPER.writeValue(new File("MyBeanSchema.json"), jsonSchema);



import java.util.Map;

public class MyBean {

    private Integer beanId;
    private String beanName;
    private Map<String, String> beanMap;
    private OtherBean otherBean;

    public MyBean() {

    public Integer getBeanId() {
        return beanId;

    public void setBeanId(Integer beanId) {
        this.beanId = beanId;

    public String getBeanName() {
        return beanName;

    public void setBeanName(String beanName) {
        this.beanName = beanName;

    public Map<String, String> getBeanMap() {
        return beanMap;

    public void setBeanMap(Map<String, String> beanMap) {
        this.beanMap = beanMap;

    public OtherBean getOtherBean() {
        return otherBean;

    public void setOtherBean(OtherBean otherBean) {
        this.otherBean = otherBean;


public class OtherBean {



Not directly answering your question, but Schema Generation is moving to a separate module:

which will have better functionality, and can evolve faster than old in-built generation. So if possible, try using that. And then you can file bugs against this, for problems with generation.

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