validation-jackson

App.java

package io.github.hejcz;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.hibernate.validator.constraints.ISBN;

import javax.validation.Valid;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;
import java.io.IOException;
import java.util.List;

class AuthorizationRequest {
    @NotEmpty
    @Size(max = 4)
    public List<Privilege> privilegeList;

    @NotNull(message = "responseType must not be null")
    @Pattern(regexp = "code", message = "responseType must be 'code'")
    public String responseType;

    @Valid
    @JsonProperty("hello")
    public Hello hello;

    @NotNull
    @ISBN
    public String number;
}

class Privilege {
}

class Hello {
    @NotNull
    public String responseType;
}

public class App {
    public static void main(String[] args) throws IOException {
        ObjectMapper om = new ObjectMapper();
        AuthorizationRequest req = om.readValue(
            "{\n" +
                "  \"privilegeList\": [],\n" +
                "  \"responseType\": \"code\",\n" +
                "  \"number\": \"978-1-56619-909-4\"\n" +
                "}",
            AuthorizationRequest.class);

        System.out.println(req);

        Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
        System.out.println(validator.validate(req));
    }
}

build.gradle

plugins {
    id 'java'
}

group 'io.github.hejcz'
version '1.0-SNAPSHOT'

sourceCompatibility = 1.8

repositories {
    maven {
        url = "url-to-artifactory"
    }
}

dependencies {
    // util
    compileOnly 'org.projectlombok:lombok:1.18.6'
    annotationProcessor 'org.projectlombok:lombok:1.18.6'

    // json
    compile 'com.fasterxml.jackson.core:jackson-databind:2.9.8'

    // validation
    compile 'org.hibernate.validator:hibernate-validator:6.0.16.Final'
    compile 'org.glassfish:javax.el:3.0.1-b09'
}