Develop Reference

Spring batch IllegalStateException for updates

I'm fairly new to Spring, and coding in general. I want to build an application from which a user can update existing records in a database from a CSV file. I'm using spring batch to do so, but when I execute the test, I get the famous:
java.lang.IllegalStateException: Existing transaction detected in JobRepository. Please fix this and try again (e.g. remove #Transactional annotations from client).
If I remove the #Transactional, I get this error instead:
org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.hql.internal.QueryExecutionRequestException: Not supported for DML operations [UPDATE com.example.testApp.Models.Person p SET p.address = p.address, p.country = p.country, p.cellphone = p.cellphone, p.city = p.city, p.phone = p.cellphone, p.email = p.email, p.age = p.age WHERE p.pplId IN (:ids_0, :ids_1, :ids_2, :ids_3, :ids_4, :ids_5, :ids_6, :ids_7, :ids_8, :ids_9, :ids_10)]
I've looked around some other solutions here, but they don't seem to work for what I want to do. I'm aware that hibernate supports batch updates, but again, I'm not sure how to make it work with what I already have.
Here's my test class (obviously with just the method I've been having problems with):
#SpringBootTest
public class PersonTests {
#Autowired
private PeopleRepository peopleRepository;
#Autowired
JobLauncher jobLauncher;
#Autowired
Job peopleInsertJob; //Separate job for inserting from a CSV file
#Autowired
Job peopleUpdateJob;
#Order(4) //executes after the insert from CSV test, for obvious reasons.
#Test
public void updateRecordsFromCsvFile() throws Exception {
Map<String, JobParameter> maps = new HashMap<>();
maps.put("time", new JobParameter(System.currentTimeMillis()));
JobParameters parameters = new JobParameters(maps);
JobExecution jobExecution = jobLauncher.run(peopleUpdateJob, parameters);
assertEquals("COMPLETED", jobExecution.getStatus().name());
}
}
Here's my Batch configuration file for the update:
#Bean
public Job peopleUpdateJob(JobBuilderFactory jobBuilderFactory,
StepBuilderFactory stepBuilderFactory,
ItemReader<Person> itemReaderForUpdate,
ItemProcessor<Person, Person> itemProcessor,
#Qualifier("DBPeopleUpdater") ItemWriter<Person> itemUpdater)
{
Step step = stepBuilderFactory.get("ETL-file-load")
.<People, People>chunk(100)
.reader(itemReaderForUpdate)
.processor(itemProcessor)
.writer(itemUpdater)
.build();
return jobBuilderFactory.get("ETL-Load")
.incrementer(new RunIdIncrementer())
.start(step)
.build();
}
#Bean
public FlatFileItemReader itemReaderForUpdate() throws Exception
{
FlatFileItemReader<Person> flatFileItemReader = new FlatFileItemReader<>();
flatFileItemReader.setResource(new FileSystemResource("src/main/resources/CSV/TestFilePeople-UpdateBatch.csv"));
flatFileItemReader.setName("PeopleCSV-Update-Reader");
flatFileItemReader.setLinesToSkip(1);
flatFileItemReader.setLineMapper(lineMapper());
return flatFileItemReader;
}
#Bean
public LineMapper<Person> lineMapper()
{
DefaultLineMapper<Person> defaultLineMapper = new DefaultLineMapper<>();
DelimitedLineTokenizer lineTokenizer = new DelimitedLineTokenizer();
lineTokenizer.setDelimiter(",");
lineTokenizer.setStrict(false);
lineTokenizer.setNames("Id","lastname", "lastname2", "firstname",
"midname","phone", "cellphone", "email", "status", "address", "city", "region", "country");
BeanWrapperFieldSetMapper<Person> fieldSetMapper = new BeanWrapperFieldSetMapper<>();
fieldSetMapper.setTargetType(Person.class);
defaultLineMapper.setLineTokenizer(lineTokenizer);
defaultLineMapper.setFieldSetMapper(fieldSetMapper);
return defaultLineMapper;
}
This is the ItemWriter I'm using for the update:
#Component
public class DBPeopleUpdater implements ItemWriter<Person> {
#Autowired
PeopleRepository peopleRepository;
#Override
public void write(List<? extends Person> list) throws Exception
{
List<String> pplIds = new ArrayList<>();
for(People p : list)
{
pplIds.add(p.getpplId());
}
peopleRepository.updatePersonsByIdIsIn(pplIds);
}
}
This is the method that I'm using from my PeopleRepository. It's the only method I have. My repository is extends CrudRepository:
#Modifying
#Query("UPDATE Person p SET p.address= p.address, p.country = p.country," +
"p.cellphone = p.cellphone, p.city = p.city, p.phone = p.cellphone," +
"p.email = p.email, p.status = p.status WHERE p.pplId IN :ids")
List<Person>updatePersonsByPplIdIsIn(List<String> ids);
I'm mapping my Person class as an entity that connects to a PostgreSQL database table. I don't have any local sql files in my project. I have no other tables in the database.
If it's not possible to solve this using spring batch, if you could guide me towards jpa/hibernate resources I could use to understand how to solve this problem, I would really appreciate it.
EDIT
Here's the code for the entity
#Entity
#Table(name = "people", schema = "example_schema")
public class Person {
#NonNull
#Id
#Column(name = "ppl_id")
private String pplId;
#Column(name = "ppl_last_name")
private String lastname;
#Column(name = "ppl_sec_last_name")
private String lastname2;
#Column(name = "ppl_first_name")
private String firstname;
#Column(name = "ppl_mid_name")
private String midname;
#Column(name = "ppl_phone_no")
private String phone;
#Column(name = "ppl_cell_no")
private String cellphone;
#Column(name = "ppl_corp_email")
private String email;
#Column(name="ppl_status")
private String status;
#Column(name="ppl_address")
private String address;
#Column(name="ppl_city")
private String city;
#Column(name="ppl_region")
private String region;
#Column(name="ppl_country")
private String country;
//Default constructor
public Person()
{
super();
}
public Person(#NonNull String pplId, String lastname, String lastname2, String firstname, String midname, String phone, String cellphone, String email, String status, String address, String city, String region, String country) {
this.pplId = pplId;
this.lastname = lastname;
this.lastname2 = lastname2;
this.firstname = firstname;
this.midname = midname;
this.phone = phone;
this.cellphone = cellphone;
this.email = email;
this.status = status;
this.address = address;
this.city = city;
this.region = region;
this.country = country;
}
public String getPplId() {
return pplId;
}
public void setWrkId(String pplId) {
this.pplId = pplId;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
public String getLastname2() {
return lastname2;
}
public void setLastname2(String lastname2) {
this.lastname2 = lastname2;
}
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getMidname() {
return midname;
}
public void setMidname(String midname) {
this.midname = midname;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getCellphone() {
return cellphone;
}
public void setCellphone(String cellphone) {
this.cellphone = cellphone;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getRegion() {
return region;
}
public void setRegion(String region) {
this.region = region;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}

Create a JSON structure from set of Java Pojo classes

I need to create a JSON object structure from set of java pojo classes. This will provide a better understand of how the objects are structured by just looking at the Json file. I tried both Gson and org.codehaus.jackson.map.ObjectMapper libraries. But couldn't generate all the Json tags relevant to all the fields in java pojo objects. The created json file is only having the values from the values stetted objects. I need to have all the fields of pojo objects in the Json file.
Gson
Hotel hotel = new Hotel(); //This hotel object includes multiple objects and those objects also include multiple objects, lists
Gson gson = new GsonBuilder().create();
String json = gson.toJson(hotel);
System.out.println(json);
ObjectMapper
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(new File("/home/Pojos.json");
This is the class and json response I got.
Hotel.java
package datatypes;
import java.util.ArrayList;
import java.util.List;
public class Hotel {
private String hotelCode;
private String chainCode;
private String hotelName;
private List<Room> rooms = new ArrayList<Room>();
private List<RoomRateRestriction> roomRateRestrictions
= new ArrayList<RoomRateRestriction>();
public String getHotelCode() {
return hotelCode;
}
public void setHotelCode(String hotelCode) {
this.hotelCode = hotelCode;
}
public String getChainCode() {
return chainCode;
}
public void setChainCode(String chainCode) {
this.chainCode = chainCode;
}
public String getHotelName() {
return hotelName;
}
public void setHotelName(String hotelName) {
this.hotelName = hotelName;
}
public List<Room> getRooms() {
return rooms;
}
public void setRooms(List<Room> rooms) {
this.rooms = rooms;
}
public void addRoom(Room room){
this.rooms.add(room);
}
public List<RoomRateRestriction> getRoomRateRestrictions() {
return roomRateRestrictions;
}
public void setRoomRateRestrictions(
List<RoomRateRestriction> roomRateRestrictions) {
this.roomRateRestrictions = roomRateRestrictions;
}
public void addRoomRateRestrictions(
RoomRateRestriction roomRateRestriction) {
this.roomRateRestrictions.add(roomRateRestriction);
}
}
JSON
{
"rooms":[],
"roomRateRestrictions":[]
}

Add serializeNulls() on GsonBuilder() to serialize null fields
Configure Gson to serialize null fields. By default, Gson omits all fields that are null
* during serialization.
class Hotel {
private String name;
private List<Guest> guests = new ArrayList<>(Collections.singleton(new Guest())); //you have to set a value in order to get the structure of the Guest class otherwise it will show an empty list []
//getter setter
}
class Guest {
private String name;
//getter setter
}
Gson
Hotel hotel = new Hotel();
Gson gson = new GsonBuilder().serializeNulls().create();
String json = gson.toJson(hotel);
System.out.println(json);
Output
{
"name":null,
"guests":[
{
"name":null
}
]
}

You can use jackson-databind library.
Maven dependency is :
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.10</version>
</dependency>
Also please find some of sample example below. Here I used Employee Object which is having nested Address object inside it.
Employee.java
public class Employee {
private int empId;
private String firstName;
private String lastName;
private double salary;
private Address address;
public Employee() {}
public Employee(int empId, String firstName, String lastName, double salary) {
this.empId = empId;
this.firstName = firstName;
this.lastName = lastName;
this.salary = salary;
}
public Employee(int empId, String firstName, String lastName, double salary, Address address) {
this.empId = empId;
this.firstName = firstName;
this.lastName = lastName;
this.salary = salary;
this.address = address;
}
public int getEmpId() {
return empId;
}
public void setEmpId(int empId) {
this.empId = empId;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}
Address.java
public class Address {
private String street;
private String city;
private String state;
private String zip;
private String country;
public Address() {}
public Address(String street, String city, String state, String zip, String country) {
this.street = street;
this.city = city;
this.state = state;
this.zip = zip;
this.country = country;
}
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getZip() {
return zip;
}
public void setZip(String zip) {
this.zip = zip;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
}
I converted a Sample java pojo class to Json and also JSON to pojo object back.
JacksonConvertion.java
public class JacksonConvertion {
public static void main(String[] args) {
pojoToJson();
jsonToPojo();
}
private static void pojoToJson() {
try {
System.out.println("Convert Object to json ");
ObjectMapper mapper = new ObjectMapper();
Address address = new Address("#103, 1st cross, manyta tech park", "Bengaluru", "Karnataka", "560010",
"India");
Address address1 = new Address();
address1.setCity("Bengaluru");
address1.setState("Karnataka");
address1.setCountry("India");
Employee emp = new Employee(1233, "Raju", "BG", 98734.23, address1);
mapper.writeValue(new File("staff.json"), emp);
String jsonString = mapper.writeValueAsString(emp);
System.out.println(jsonString);
} catch (JsonProcessingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private static void jsonToPojo() {
try {
System.out.println("Convert Json to Object ");
ObjectMapper mapper = new ObjectMapper();
Employee employee = mapper.readValue(new File("staff.json"), Employee.class);
System.out.println(employee.getFirstName());
System.out.println(employee.getSalary());
System.out.println(employee.getAddress().getCity());
} catch (IOException e) {
e.printStackTrace();
}
}
}
Also included some of links for your reference.
Link1
Link2

I think this would work fine
Add http://www.java2s.com/Code/Jar/c/Downloadcomfasterxmljacksondatabindjar.htm and http://www.java2s.com/Code/Jar/j/Downloadjacksondatabind205sourcesjar.htm to your library.
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class javaPojo {
public static void main(String args[]){
Hotel hotel = new Hotel();
ObjectMapper mapper = new ObjectMapper();
try {
String json = mapper.writeValueAsString(hotel);
System.out.println("JSON = " + json);
} catch (JsonProcessingException e) {
e.printStackTrace();
}}
}
Hotel
import java.util.ArrayList;
import java.util.List;
public class Hotel {
private String hotelCode;
private String chainCode;
private String hotelName;
private List<Room> rooms = new ArrayList<Room>();
private List<RoomRateRestriction> roomRateRestrictions
= new ArrayList<RoomRateRestriction>();
public String getHotelCode() {
return hotelCode;
}
public void setHotelCode(String hotelCode) {
this.hotelCode = hotelCode;
}
public String getChainCode() {
return chainCode;
}
public void setChainCode(String chainCode) {
this.chainCode = chainCode;
}
public String getHotelName() {
return hotelName;
}
public void setHotelName(String hotelName) {
this.hotelName = hotelName;
}
public List<Room> getRooms() {
return rooms;
}
public void setRooms(List<Room> rooms) {
this.rooms = rooms;
}
public void addRoom(Room room){
this.rooms.add(room);
}
public List<RoomRateRestriction> getRoomRateRestrictions() {
return roomRateRestrictions;
}
public void setRoomRateRestrictions(
List<RoomRateRestriction> roomRateRestrictions) {
this.roomRateRestrictions = roomRateRestrictions;
}
public void addRoomRateRestrictions(
RoomRateRestriction roomRateRestriction) {
this.roomRateRestrictions.add(roomRateRestriction);
}
}
Room
public class Room {
}
RoomRateRestriction
public class RoomRateRestriction {
}
OUTPUT - JSON = {"hotelCode":null,"chainCode":null,"hotelName":null,"rooms":[],"roomRateRestrictions":[]}

Not able to retrive data from Crud Operation in Hibernate

I have a application written in Spring, Hibernate and SpringBoot,
I have 2 entities class with one to many mapping,
Here are my LeadUserDb entity class
#Entity
#Table(name="lead_user_db")
#NamedQuery(name="LeadUserDb.findAll", query="SELECT l FROM LeadUserDb l")
public class LeadUserDb implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
#Column(name="branchcode")
private String branchcode;
#Column(name="reporting_level")
private int reportingLevel;
//bi-directional many-to-one association to UserBasicDetailsDb
#ManyToOne
#JoinColumn(name="email_Id")
private UserBasicDetailsDb userBasicDetailsDb;
public LeadUserDb() {
}
public String getBranchcode() {
return this.branchcode;
}
public void setBranchcode(String branchcode) {
this.branchcode = branchcode;
}
public int getReportingLevel() {
return this.reportingLevel;
}
public void setReportingLevel(int reportingLevel) {
this.reportingLevel = reportingLevel;
}
public UserBasicDetailsDb getUserBasicDetailsDb() {
return this.userBasicDetailsDb;
}
public void setUserBasicDetailsDb(UserBasicDetailsDb userBasicDetailsDb) {
this.userBasicDetailsDb = userBasicDetailsDb;
}
And This is my UserBasicDetailsDb Entity Class
#Entity
#Table(name="user_basic_details_db")
public class UserBasicDetailsDb implements Serializable {
private static final long serialVersionUID = 1L;
#Id
private String email;
private String address;
private String city;
private String dob;
private String mobile;
private String name;
private String pan;
private String pincode;
private String state;
#OneToMany(mappedBy="userBasicDetailsDb")
private List<LeadUserDb> leadUserDbs;
public UserBasicDetailsDb() {
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
public String getAddress() {
return this.address;
}
public void setAddress(String address) {
this.address = address;
}
public String getCity() {
return this.city;
}
public void setCity(String city) {
this.city = city;
}
public String getDob() {
return this.dob;
}
public void setDob(String dob) {
this.dob = dob;
}
public String getMobile() {
return this.mobile;
}
public void setMobile(String mobile) {
this.mobile = mobile;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getPan() {
return this.pan;
}
public void setPan(String pan) {
this.pan = pan;
}
public String getPincode() {
return this.pincode;
}
public void setPincode(String pincode) {
this.pincode = pincode;
}
public String getState() {
return this.state;
}
public void setState(String state) {
this.state = state;
}
public List<LeadUserDb> getLeadUserDbs() {
return this.leadUserDbs;
}
public void setLeadUserDbs(List<LeadUserDb> leadUserDbs) {
this.leadUserDbs = leadUserDbs;
}
public LeadUserDb addLeadUserDb(LeadUserDb leadUserDb) {
getLeadUserDbs().add(leadUserDb);
leadUserDb.setUserBasicDetailsDb(this);
return leadUserDb;
}
public LeadUserDb removeLeadUserDb(LeadUserDb leadUserDb) {
getLeadUserDbs().remove(leadUserDb);
leadUserDb.setUserBasicDetailsDb(null);
return leadUserDb;
}
what i want to achieve is to create a query like this one
SELECT a.branchcode as branchCode,b.name FROM lead_user_db a
inner join user_basic_details_db b
where b.email = a.email_id and a.reporting_level = 3
here is what I have written my Repository class
public interface GetUserList extends CrudRepository<LeadUserDb, Integer> {
#Query(value = "SELECT a.id, a.branchcode as branchCode,b.name as name,a.reporting_level,a.email_id FROM lead_user_db a\n" +
"inner join user_basic_details_db b\n" +
"where b.email = a.email_id and a.reporting_level = ?1", nativeQuery = true)
List<LeadUserDb> findByReportingLevel(int reportingLevel);
}
and this is how I am calling it
UserBasicDetailsDb details = GetUserList.findByReportingLevel(3);
NOTE
Getting a new error Cannot determine value type from string test#dev.com
I am getting a hell lot of data, and the actual output have only 2 records
My question is how can i fetch the list of user based on reportingLevel
Any help would be appreciated

What's wrong with my builder pattern?

I have a problem in realisation of Builder pattern.
I have 2 classes:
package course_2;
import java.util.Date;
public class Student {
private static int idStart = 0;
private final int id = idStart++;
private String name;
private String surname;
private String secondName;
private Date birthDate;
private String address;
private String phone;
private int course;
private int group;
public static class Builder {
// Обязательные параметры
private final String name;
private final String surname;
private final Date birthDate;
// Необязательные параметры, инициализация по умолчанию
private String secondName = "";
private String address = "";
private String phone = "";
private int course = 1;
private int group = 1;
public Builder(String name, String surname, Date birthDate) {
this.name = name;
this.surname = surname;
this.birthDate = (Date) birthDate.clone();
}
public Builder SecondName(String secondName) {
this.secondName = secondName;
return this;
}
public Builder address(String address) {
this.address = address;
return this;
}
public Builder phone(String phone) {
this.phone = phone;
return this;
}
public Builder course(int course) {
this.course = course;
return this;
}
public Builder group(int group) {
this.group = group;
return this;
}
}
private Student(Builder builder) {
this.name = builder.name;
this.surname = builder.surname;
this.secondName = builder.secondName;
this.birthDate = builder.birthDate;
this.address = builder.address;
this.phone = builder.phone;
this.course = builder.course;
this.group = builder.group;
}
}
The problem is when I'm trying to call a Builder from my client code:
Student studentOne = new Student.Builder("Andrue", "Booble", /*Date variable here*/);
I'm getting a compiler problem :
Error:(24, 30) java: incompatible types: course_2.Student.Builder
cannot be converted to course_2.Student
Can somebody help me with understanding, why does this happen and how I can solve it? Thanks!

You need to add the following to your Builder:
public Student build(){
return new Student(this);
}
And call it like this:
Student studentOne = new Student.Builder("Andrue", "Booble", null).build();

new Student.Builder("Andrue", "Booble", /*Date variable here*/); returns you builder object not student.
Your factory is missing method create which invoke Student constructor
it should looks like this
public Student create(){
return new student (this);
}
and be implemented inside Builder class
now if you want to create Student, you call
Student studentOne = new Student.Builder("Andrue", "Booble", /*Date variable here*/).create();

Jackson JSON, Immutable Classes, and Interfaces

I am playing with the Jackson examples and am having some trouble getting deserialization to work with immutable classes and interfaces.
Below is my code:
package com.art.starter.jackson_starter;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
/** * Hello world! * */ public class App {
public static void main( String[] args ) throws JsonGenerationException, JsonMappingException, IOException
{
System.out.println( "Hello World!" );
AddressImpl.AddressBuilder builder = new AddressImpl.AddressBuilder();
NameImpl.Builder nameBuilder = new NameImpl.Builder();
UserImpl.Builder userBuilder = new UserImpl.Builder();
Name name = nameBuilder.first("FirstName")
.last("LastName")
.build();
Address address = builder.setCity("TestCity")
.setCountry("TestCountry")
.setState("PA")
.setStreet("TestAddress")
.setZip(123)
.build();
User user = userBuilder.address(address)
.gender(User.Gender.MALE)
.isVerified(true)
.userImage(new byte[5])
.build();
System.out.println(address);
System.out.println(name);
System.out.println(user);
StringWriter sw = new StringWriter();
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(sw, user);
System.out.println(sw);
StringReader sr = new StringReader("{\"address\":{\"state\":\"PA\",\"country\":\"TestCountry\",\"street\":\"TestAddress\",\"city\":\"TestCity\",\"zip\":123},\"verified\":true,\"gender\":\"MALE\",\"userImage\":\"AAAAAAA=\"}");
/*
This line throws the Exception
*/
User user2 = mapper.readValue(sr, UserImpl.class);
System.out.println(user2);
} }
package com.art.starter.jackson_starter;
import java.util.Arrays;
import org.codehaus.jackson.annotate.JsonCreator;
import org.codehaus.jackson.annotate.JsonProperty;
public final class UserImpl implements User
{
private final Address address;
private final Gender gender;
private final byte[] userImage;
private final boolean isVerified;
public static class Builder
{
private Address address;
private Gender gender;
// private Name name;
private byte[] userImage;
private boolean isVerified;
public Builder address(Address address)
{
this.address = address;
return this;
}
public Builder gender(Gender gender)
{
this.gender = gender;
return this;
}
// public Builder name(Name name)
// {
// this.name = name;
// return this;
// }
public Builder userImage(byte[] userImage)
{
this.userImage = userImage;
return this;
}
public Builder isVerified(boolean isVerified)
{
this.isVerified = isVerified;
return this;
}
public UserImpl build()
{
return new UserImpl(address, gender, userImage, isVerified);
}
}
#JsonCreator
public UserImpl(#JsonProperty("address") Address address, #JsonProperty("gender") Gender gender, #JsonProperty("userImage") byte[] userImage,
#JsonProperty("verified") boolean isVerified)
{
super();
this.address = address;
this.gender = gender;
this.userImage = userImage;
this.isVerified = isVerified;
}
public Address getAddress()
{
return address;
}
public Gender getGender()
{
return gender;
}
public byte[] getUserImage()
{
return userImage;
}
public boolean isVerified()
{
return isVerified;
}
#Override
public String toString()
{
StringBuilder builder2 = new StringBuilder();
builder2.append("UserImpl [address=");
builder2.append(address);
builder2.append(", gender=");
builder2.append(gender);
builder2.append(", isVerified=");
builder2.append(isVerified);
builder2.append(", name=");
builder2.append(", userImage=");
builder2.append(Arrays.toString(userImage));
builder2.append("]");
return builder2.toString();
}
}
package com.art.starter.jackson_starter;
import org.codehaus.jackson.annotate.JsonCreator;
import org.codehaus.jackson.annotate.JsonProperty;
public final class AddressImpl implements Address
{
private final String city;
private final String country;
private final String street;
private final String state;
private final int zip;
public static class AddressBuilder
{
private String city;
private String country;
private String street;
private String state;
private int zip;
public AddressBuilder setCity(String city)
{
this.city = city;
return this;
}
public AddressBuilder setCountry(String country)
{
this.country = country;
return this;
}
public AddressBuilder setStreet(String street)
{
this.street = street;
return this;
}
public AddressBuilder setState(String state)
{
this.state = state;
return this;
}
public AddressBuilder setZip(int zip)
{
this.zip = zip;
return this;
}
public AddressImpl build()
{
return new AddressImpl(city, country, street, state, zip);
}
}
#JsonCreator
public AddressImpl(#JsonProperty("city") String city, #JsonProperty("country") String country, #JsonProperty("street") String street,
#JsonProperty("state") String state, #JsonProperty("zip") int zip)
{
this.city = city;
this.country = country;
this.street = street;
this.state = state;
this.zip = zip;
}
public String getCity()
{
return city;
}
public String getCountry()
{
return country;
}
public String getStreet()
{
return street;
}
public String getState()
{
return state;
}
public int getZip()
{
return zip;
}
#Override
public String toString()
{
StringBuilder builder = new StringBuilder();
builder.append("AddressImpl [city=");
builder.append(city);
builder.append(", country=");
builder.append(country);
builder.append(", state=");
builder.append(state);
builder.append(", street=");
builder.append(street);
builder.append(", zip=");
builder.append(zip);
builder.append("]");
return builder.toString();
}
}
The issue appears to be with Address. I get this exception:
Exception in thread "main" org.codehaus.jackson.map.JsonMappingException: Can not construct instance of com.art.starter.jackson_starter.Address, problem: abstract types can only be instantiated with additional type information
at [Source: java.io.StringReader#785f8172; line: 1, column: 2]
at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163)
at org.codehaus.jackson.map.deser.StdDeserializationContext.instantiationException(StdDeserializationContext.java:212)
at org.codehaus.jackson.map.deser.AbstractDeserializer.deserialize(AbstractDeserializer.java:97)
at org.codehaus.jackson.map.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:230)
at org.codehaus.jackson.map.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:595)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:472)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:350)
at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2391)
at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1614)
at com.art.starter.jackson_starter.App.main(App.java:56)
I am sure this is because there is no way for Jackson to resolve Address which is an interface to AddressImpl which is a concrete implementation. I have been poking through the docs and have looked at a few articles regarding the #JsonDeserialize(as=AddressImpl.class),but it didn't work. So I am stumped. Has anyone ever gotten this to work, is it even supported?
It works like a champ if I replace Address with AddressImpl in the UserImpl class.

Just in case you hadn't seen it, here's a blog entry that discusses working with immutable objects and Jackson.
But you should definitely be able to use #JsonDeserialize(as=AddressImpl.class); either by adding it to Address.java interface (either directly or by using mix-ins), or by adding it to field or property. One thing to note is that for deserialization, it MUST be next to accessor you use; setter if you have one, if not, next to field. Annotations are not (yet) shared between accessors; so for example adding it to 'getter' would not work.
Jackson 1.8 also finally allows registration of abstract-to-concrete types (see http://jira.codehaus.org/browse/JACKSON-464 for more details) which might be the best option to indicate that 'AddressImpl' is to be used for 'Address'.