I try to get the return value using JPA.
But my database Procedure returns multiple results, and JPA only gets the first return value. as the picture shows.
The result I want is the third one, but I only get the first one.
How to get the third one? Thanks.
Java Result
Database Result
Entity.java
#Entity
#NamedStoredProcedureQueries(
{
#NamedStoredProcedureQuery(
name = "SpringTestProcedure",
procedureName = "SpringTestProcedure",
parameters = {
#StoredProcedureParameter(mode = ParameterMode.IN, name = "id", type = Test.class),
#StoredProcedureParameter(mode = ParameterMode.IN, name = "firstName", type = Test.class),
#StoredProcedureParameter(mode = ParameterMode.IN, name = "lastName", type = Test.class)
}
)
}
)
#Table(name = "Users")
public class Test {
public Test() {
}
public Test(Integer id, String firstName, String lastName) {
this.id = id;
this.firstName = firstName;
this.lastName = lastName;
}
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Integer id;
#Column(name = "firstName")
private String firstName;
#Column(name = "lastName")
private String lastName;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
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;
}
}
Repository.java
#Repository
public interface SpringTestRepository extends JpaRepository<Test, Integer> {
#Procedure(procedureName = "SpringTestProcedure")
public List<Object[]> getEntity(#Param("id") Integer id,
#Param("firstName") String firstName,
#Param("lastName") String lastName);
}
ServiceImpl.java
#Service
public class SpringTestServiceImpl implements SpringTestService {
#Autowired
private SpringTestRepository springTestRepository;
#Override
public Test getEntity(Integer id, String firstName, String lastName) {
List<Object[]> list = springTestRepository.getEntity(id, firstName, lastName);
for (Object[] object : list) {
System.out.println(Arrays.toString(object));
}
return null;//springTestRepository.getEntity(id, firstName, lastName);
}
}
Change the type of parameters
parameters = {
#StoredProcedureParameter(mode = ParameterMode.IN, name = "id", type = Integer.class),
#StoredProcedureParameter(mode = ParameterMode.IN, name = "firstName", type = String.class),
#StoredProcedureParameter(mode = ParameterMode.IN, name = "lastName", type = String.class)
}
Change method getEntity
#Override
public Test getEntity(Integer id, String firstName, String lastName) {
List<Test> list = springTestRepository.getEntity(id, firstName, lastName);
for (Test test : list) {
System.out.println(test.getId()+" "+test.getFirstName()+" "+test.getLastName());
}
return list.get(2);//springTestRepository.getEntity(id, firstName, lastName);
}
Related
I have the below repository which extends JpaRepository.
public interface UserRepository extends JpaRepository<User, Long> {
// #Query(value = "SELECT * FROM users u WHERE u.email = ?1", nativeQuery = true)
User findByEmail(String email);
}
When I call the function from the below mapping no result is returned, no empty object, nothing.
#GetMapping(value = "email")
public User getByEmail(#RequestBody String email) {
return userRepository.findByEmail(email);
}
Found similar issues but with no actual answers. I have also tried native queries, as you can see the commented #Query annotation. The mapping is in a simple controller which just has a post function and a get function for all the users.
What am I doing wrong?
Edit ---
User model
package com.example.demo.User;
import javax.persistence.*;
#Entity(name="Users")
#Table(name = "users", uniqueConstraints = {
#UniqueConstraint(name = "user_email_unique", columnNames = "email")
})
public class User {
#Id
#SequenceGenerator(
name = "users_sequence",
sequenceName = "users_sequence",
allocationSize = 1
)
#GeneratedValue(
strategy = GenerationType.SEQUENCE,
generator = "users_sequence"
)
#Column(name = "id", updatable = false) // Column options for the id
private long id;
#Column(name = "first_name", nullable = false, columnDefinition = "TEXT")
private String name;
private String lastName;
#Column(nullable = false, columnDefinition = "TEXT")
private String email;
private int age;
private int weight;
public User() {}
public User(String name, String lastName, String email, int age, int weight) {
this.name = name;
this.lastName = lastName;
this.email = email;
this.age = age;
this.weight = weight;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
}
I have found the answer in the docs of spring boot, only POST/PUT requests have a request body.
#RequestBody annotation binds the content sent in (POST / PUT) request body with the annotated variable. Since there is no 'body' part in GET request, spring throws HttpMessageNotReadableException to indicate the same.
As a general rule, you can only use #RequestBody for the requests which can have 'body' content e.g. POST or PUT.
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;
}
I tried to create a query that returns different columns from two tables, and I want the query columns to be mapped to the user definition class.
my Student Model :
package com.example.demo.models;
import javax.persistence.*;
import java.util.List;
#Entity
#Table
public class Students {
public Students() {
}
public Students(String firstName, String lastName, String age) {
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
}
#Column
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Column
private String firstName;
#Column
private String lastName;
#Column
private String age;
#ManyToMany(cascade = {CascadeType.DETACH, CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REFRESH})
#JoinTable(name = "Student_Course",
joinColumns = #JoinColumn(name="studentID"),
inverseJoinColumns = #JoinColumn(name="courseID"))
private List<Course> courses;
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 String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public List<Course> getCourses() {
return courses;
}
public void setCourses(List<Course> courses) {
this.courses = courses;
}
}
my Course Model :
package com.example.demo.models;
import javax.persistence.*;
import java.util.List;
#Entity
#Table
public class Course {
public Course() {
}
public Course(String courseName, String unitCount) {
this.courseName = courseName;
this.unitCount = unitCount;
}
#Column
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Column(name = "CourseName")
private String courseName;
#Column
private String unitCount;
#ManyToMany(fetch = FetchType.LAZY, cascade = {CascadeType.DETACH, CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REFRESH})
#JoinTable(name = "Student_Course",
joinColumns = #JoinColumn(name="courseID"),
inverseJoinColumns = #JoinColumn(name="studentID"))
private List<Students> students;
#ManyToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "teacherID")
private Teachers teachers;
public String getCourseName() {
return courseName;
}
public void setCourseName(String courseName) {
this.courseName = courseName;
}
public String getUnitCount() {
return unitCount;
}
public void setUnitCount(String unitCount) {
this.unitCount = unitCount;
}
public List<Students> getStudents() {
return students;
}
public void setStudents(List<Students> students) {
this.students = students;
}
public Teachers getTeachers() {
return teachers;
}
public void setTeachers(Teachers teachers) {
this.teachers = teachers;
}
}
my Query in Service Layer:
#Transactional
public List<StudentInfo> getStudentInfo(){
Session session = sf.openSession();
Query hql = session.createQuery("select std.firstName, std.lastName, c.courseName from Students std join std.courses c");
var data = hql.list();
session.close();
return data;
}
and i want map query columns to this simple class :
package com.example.demo.ViewModels;
public class StudentInfo {
private String firstName;
private String lastName;
private String courseName;
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 String getCourseName() {
return courseName;
}
public void setCourseName(String courseName) {
this.courseName = courseName;
}
}
and in finally..
my controller Class :
#RequestMapping(value = "/", method = RequestMethod.GET)
public ModelAndView Index() {
List<StudentInfo> data = studentRepository.getAll();
return new ModelAndView("indexView", "data", data);
}
notice : i`m using thymeleaf in this project.
please help me.
thanks.:D
If you use Spring Data JPA you should be able to do it in the repository using the #Query annotation:
#Query(value = "SELECT new com.path.to.StudentInfo(std.firstName, " +
"std.lastName, c.courseName) " +
"FROM Students std join std.courses c"
List<StudentInfo> getAllStudentInfo();
Make sure you have an all-args constructor in StudentInfo though.
If you use Hibernate, it's almost the same:
entityManager.createQuery("SELECT new com.path.to.StudentInfo(std.firstName, " +
"std.lastName, c.courseName) " +
"FROM Students std join std.courses c",
StudentInfo.class)
Edit: I have concerns about whether it's supposed to work when using join, but give it a try regardless.
I have three entity classes, I have written the query which includes join of two tables.
Table: ExpensesCategories
#Entity
#Table(name = "ExpensesCategories")
public class ExpensesCategories {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "category_id", unique = true)
private int categoryId;
#NotNull
private String categoryName;
#NotNull
private String categoryCodeInBankStats;
public int getCategoryId() {
return categoryId;
}
public void setCategoryId(int categoryId) {
this.categoryId = categoryId;
}
public String getCategoryName() {
return categoryName;
}
public void setCategoryName(String categoryName) {
this.categoryName = categoryName;
}
public String getCategoryCodeInBankStats() {
return categoryCodeInBankStats;
}
public void setCategoryCodeInBankStats(String categoryCodeInBankStats) {
this.categoryCodeInBankStats = categoryCodeInBankStats;
}
}
Table: Transactions
#Entity
#Table(name = "TransactionHistory")
public class TransactionHistory {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int id;
#Temporal(TemporalType.DATE)
private Date dateOfTransaction;
private String transactionType;
private String refNo;
private Date valueDate;
private double withdrawalAmount;
private double depositAmount;
private double closingBalance;
#ManyToOne
#JoinColumn(name="userDetailsId", referencedColumnName="user_id")
private UserDetails userDetails;
#ManyToOne
#JoinColumn(name="expenseCategoriesId", referencedColumnName="category_id")
private ExpensesCategories expenseCategories;
public TransactionHistory(int userId, Date dateOfTransaction, String transactionType, String refNo, Date valueDate,
double withdrawalAmount, double depositAmount, double closingBalance) {
this.dateOfTransaction = dateOfTransaction;
this.transactionType = transactionType;
this.refNo = refNo;
this.valueDate = valueDate;
this.withdrawalAmount = withdrawalAmount;
this.depositAmount = depositAmount;
this.closingBalance = closingBalance;
}
public TransactionHistory() {
}
public Date getDateOfTransaction() {
return dateOfTransaction;
}
public void setDateOfTransaction(Date date) {
this.dateOfTransaction = date;
}
public String getTransactionType() {
return transactionType;
}
public void setTransactionType(String transactionType) {
this.transactionType = transactionType;
}
public String getRefNo() {
return refNo;
}
public void setRefNo(String refNo) {
this.refNo = refNo;
}
public Date getValueDate() {
return valueDate;
}
public void setValueDate(Date valueDate) {
this.valueDate = valueDate;
}
public double getWithdrawalAmount() {
return withdrawalAmount;
}
public void setWithdrawalAmount(double withdrawalAmount) {
this.withdrawalAmount = withdrawalAmount;
}
public double getDepositAmount() {
return depositAmount;
}
public void setDepositAmount(double depositAmount) {
this.depositAmount = depositAmount;
}
public double getClosingBalance() {
return closingBalance;
}
public void setClosingBalance(double closingBalance) {
this.closingBalance = closingBalance;
}
public UserDetails getUserDetails() {
return userDetails;
}
public void setUserDetails(UserDetails userDetails) {
this.userDetails = userDetails;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public ExpensesCategories getExpenseCategories() {
return expenseCategories;
}
public void setExpenseCategories(ExpensesCategories expenseCategories) {
this.expenseCategories = expenseCategories;
}
}
Table: User Details
#Entity
#Table(name = "Employee")
public class UserDetails {
#Id
#Column(name = "user_id", unique = true)
private int id;
#NotNull
private String firstname;
#NotNull
private String lastname;
#Column(unique = true)
#NotNull
private String emailaddress;
#NotNull
private String role;
public UserDetails(String firstname, String lastname, String emailaddress, String role) {
this.firstname = firstname;
this.lastname = lastname;
this.emailaddress = emailaddress;
this.role = role;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public UserDetails() {
}
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 String getEmailaddress() {
return emailaddress;
}
public void setEmailaddress(String emailaddress) {
this.emailaddress = emailaddress;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
#Override
public String toString() {
return "Employee [id=" + id + ", firstname=" + firstname + ", lastname=" + lastname + ", emailaddress="
+ emailaddress + ", role=" + role + "]";
}
I have written query like this in transaction entity.
#Query( nativeQuery=true, value="SELECT a.expense_categories_id, a.Total_withdrawal_Amount, b.category_code_in_bank_stats, b.category_name FROM (SELECT expense_categories_id , SUM(withdrawal_amount) AS Total_withdrawal_Amount FROM transaction_history GROUP BY expense_categories_id) a join expenses_categories b on a.expense_categories_id = b.category_id
")
List<Object[]> getCategorizedExpenses();
My Json Response is like:
[
[
1,
21,
"UPI",
"UPI Payments"
],
[
2,
3733.59,
"POS",
"Shopping"
]
]
But i want json response with column names as well:
[
[
expense_categories_id: 1,
Total_withdrawal_Amount: 21,
category_code_in_bank_stats: "UPI",
category_name: "UPI Payments"
],
[
expense_categories_id: 2,
Total_withdrawal_Amount: 3733.59,
category_code_in_bank_stats: "POS",
category_name: "Shopping"
]
]
Please help me out..
You would need to map the results directly to a POJO class and ad some json config:
1) Define the pojo
public ResultClass implements Serializable{
#JsonProperty("expense_categories_id")
private Integer expenseCategoriesId;
...
public ResultClass(Integer expenseCategoriesId ... // rest params){
this.expenseCategoriesId = expenseCategoriesId;
...
}
}
2) Define the mapping:
#SqlResultSetMapping(
name="myMapping",
classes={
#ConstructorResult(
targetClass=ResultClass.class,
columns={
#ColumnResult(name="expenseCategoriesId"),
#ColumnResult(name="totalWithdrawalAmount")
// further mappings ...
}
)
}
)
3) Define a native query
#NamedNativeQuery(name="TransactionHistory.myQuery"
, query="SELECT new mypackage.ResultClass(a.expense_categories_id as expeneCategoriesId ... ) from ...")
4) Define this method in the CrudRepository without the #Query annotation:
public List<ResultClass> myQuery();
Teh #SqlResultSetMapping and #NamedNativeQuery would need to be defined on one of your mapped entities.
Your native query will give you an object[][] as an result. So, it actually a mxn rows.
So,
I think you should create a class names Response
public class Response{
private Long expense_categories_id;
private Double Total_withdrawal_Amount;
private String category_code_in_bank_stats;
private String category_name;
//getters and setters for all attributes
}
List<Response> fillCategorizedExpenses(){
List<Response> response_List = new ArrayList<>();
Response response = null;
Object[][] // fill each object with by accessing their index from
//this array.
for() //iterate the object array. {
response = new Response();
response.setExpense_categories_id(value); // set all attributes.
....
....
....
response_List.add(response);
}
return response_List; //this will print as you need in your project.
}
Thank You :) Hope this might help you out.
I'm trying to use JPA for the first time in a project. Most of my entities are working fine, but I am having trouble with one which is part of a Joined Inheritance Strategy.The entities are also being serialised by Jackson so they also have Json annotations.
The parent "User" class:
(Edit: added "Type" field)
#JsonTypeInfo(use=JsonTypeInfo.Id.NAME, include= JsonTypeInfo.As.WRAPPER_OBJECT)
#JsonTypeName("user")
#JsonSubTypes({
#JsonSubTypes.Type(name="customer", value=Customer.class),
#JsonSubTypes.Type(name="employee", value=Employee.class)})
#Entity(name = "User")
#Table(name="user")
#Inheritance(strategy = InheritanceType.JOINED)
#DiscriminatorColumn(name="type",discriminatorType = DiscriminatorType.INTEGER)
#NamedQuery(name="User.all",query = "select u from User u")
public abstract class User {
#Id
private String username;
#Column(name = "type",nullable = false)
private int type;
public User(){
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public abstract Set<Order> getOrders();
}
A Child "Employee"
#JsonTypeName("employee")
#Entity(name="Employee")
#Table(name="employee")
#PrimaryKeyJoinColumn(name = "username",referencedColumnName = "username")
#DiscriminatorValue("1")
#NamedQuery(name = "Employee.all",query = "select e from Employee e")
public class Employee extends User implements Serializable{
private String username;
private String firstName;
private String lastName;
private String email;
#Convert(converter = LocalDatePersistenceConverter.class)
private LocalDate dateStarted;
#Convert(converter = LocalDatePersistenceConverter.class)
private LocalDate dateEnded;
#OneToMany(mappedBy = "employee",targetEntity = Order.class,fetch = FetchType.EAGER,cascade = CascadeType.PERSIST)
#JsonIgnore
private Set<Order> orders = new HashSet<>();
public Employee() {
}
#Override
public Set<Order> getOrders() {
return orders;
}
public void setOrders(Set<Order> orders) {
this.orders = orders;
}
public void addOrder(Order order){
orders.add(order);
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public void setEmail(String email) {
this.email = email;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public String getEmail() {
return email;
}
public String getDateStarted() {
if(dateStarted != null)
return dateStarted.toString();
else return null;
}
public void setDateStarted(LocalDate dateStarted) {
this.dateStarted = dateStarted;
}
public String getDateEnded() {
if(dateEnded != null)
return dateEnded.toString();
else return null;
}
public void setDateEnded(LocalDate dateEnded) {
this.dateEnded = dateEnded;
}
#Override
public String toString(){
return getUsername();
}
}
And a child "Customer":
(Edit: removed #Id field)
#JsonTypeName("customer")
#Entity(name="Customer")
#Table(name="customer")
#PrimaryKeyJoinColumn(name = "username",referencedColumnName = "username")
#DiscriminatorValue("2")
#NamedQueries({
#NamedQuery(name="Customer.all",query = "select c from Customer c")
})
public class Customer extends User implements Serializable{
public enum VIP_TYPE {NORMAL,SILVER,GOLD,DIAMOND}
#Transient
private static final int SILVER_THRESHOLD = 1000;
#Transient
private static final int GOLD_THRESHOLD = 2000;
#Transient
private static final int DIAMOND_THRESHOLD = 3000;
private String firstName;
private String lastName;
private String email;
private String address;
private String postcode;
private String mobileNumber;
private String homeNumber;
#Convert(converter = VipTypeConverter.class)
private VIP_TYPE vipGroup;
private String discount;
#OneToMany(mappedBy = "customer",targetEntity = Order.class,fetch=FetchType.EAGER,cascade = CascadeType.ALL)
#JsonIgnore
private Set<Order> orders = new HashSet<>();
public Customer() {
}
#Override
public Set<Order> getOrders() {
return orders;
}
public void setOrders(Set<Order> orders) {
this.orders = orders;
}
public void addOrder(final Order order){
orders.add(order);
updateVipGroup();
}
private void updateVipGroup() {
int sum = orders.stream().map(Order::getPayment).distinct().mapToInt(p->p.getAmmount()).sum();
if(sum > DIAMOND_THRESHOLD){
vipGroup = VIP_TYPE.DIAMOND;
return;
}
if(sum > GOLD_THRESHOLD){
vipGroup = VIP_TYPE.GOLD;
return;
}
if(sum > SILVER_THRESHOLD){
vipGroup = VIP_TYPE.SILVER;
return;
}
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public void setEmail(String email) {
this.email = email;
}
public void setAddress(String address) {
this.address = address;
}
public void setDiscount(String discount) {
this.discount = discount;
}
public void setVipGroup(VIP_TYPE vipGroup) {
this.vipGroup = vipGroup;
}
public void setHomeNumber(String homeNumber) {
this.homeNumber = homeNumber;
}
public void setMobileNumber(String mobileNumber) {
this.mobileNumber = mobileNumber;
}
public void setPostcode(String postcode) {
this.postcode = postcode;
}
public String getDiscount() {
return discount;
}
public VIP_TYPE getVipGroup() {
return vipGroup;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public String getEmail() {
return email;
}
public String getAddress() {
return address;
}
public String getPostcode() {
return postcode;
}
public String getMobileNumber() {
return mobileNumber;
}
public String getHomeNumber() {
return homeNumber;
}
}
Persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="local" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>jdbc/cod</jta-data-source>
<class>com.technicalpioneers.cod.user.Customer</class>
<class>com.technicalpioneers.cod.user.Employee</class>
<class>com.technicalpioneers.cod.user.User</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
</persistence-unit>
</persistence>
Everything to do with "employee" works file, I can use the named query Employee.all to find all the employees in the database.
However, If I try to retrieve any customers I get errors. If I try to run the named query Customer.all I get:
java.lang.IllegalArgumentException: NamedQuery of name: Customer.all not found.
If I try to use EntityManager's find() method to find a particular customer I get:
javax.servlet.ServletException: Exception [EclipseLink-43] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Missing class for indicator field value [2] of type [class java.lang.Integer].
Descriptor: RelationalDescriptor(com.technicalpioneers.cod.user.User --> [DatabaseTable(user)])
I don't understand why the Customer entity is not being found by JPA. I've checked the user table and the "type" column is there with correct numbers, and #DescriminatorValue is set correctly. It's almost like the annotations are being ignored?
Have done many clean rebuilds and redeploys too. Any help would be very much appreciated!
I found this eventually. https://bugs.eclipse.org/bugs/show_bug.cgi?id=429992
It turns out EclipseLink will silently ignore entities with lambda expressions! Very annoying for it to not be at least mentioned in logs!
Thanks to everyone who took the time!