How to include Bean Validation constraints in Jackson generated JSON schema

Question

I am using Jersey 1.2 (still using JDK 1.5) and have developed a REST Booking Web Resource and an associated Booking POJO.

I have used Bean Validation to restrict the size/type of the fields e.g.

@NotNull
@Size(message="invalid size",min=3,max=20)
@Pattern(message="invalid pattern",regexp = "^[A-Za-z]*")
@JsonProperty(value = "forename")
private String forename;

and have used the Jackson ObjectMapper.generateJsonSchema class to generate the JSON schema however this ignores all the validation annotations so I just get:

"forename" : {
  "type" : "string"
}

Is there any way to include the restriction information as part of the generated schema?

Many thanks

Answer 1

Looks like jackson-module-jsonSchema 2.5.0+ now supports some of the annotations now:

ValidationSchemaFactoryWrapper personVisitor = new    
ValidationSchemaFactoryWrapper();
ObjectMapper mapper = new ObjectMapper();
mapper.acceptJsonFormatVisitor(Person.class, personVisitor);
JsonSchema personSchema = personVisitor.finalSchema();

Answer 2

There is no way to do that out-of-the-box, but this extension module:

https://github.com/FasterXML/jackson-module-jsonSchema

should let you modify Schema Generator in a way to add whatever extra information you want. Caveat: this is a new project and probably requires you to use 2.2.0-SNAPSHOT version of core Jackson components.