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Hibernate doesn't show the values of arraylist correctly [duplicate]

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How do I print my Java object without getting "SomeType#2f92e0f4"?
(13 answers)
Closed 2 years ago.
I am studying onetomany in hibernate I have an Instructor that has more than one course.I am using Instructor and Course class for Annotating my tables with the same names in the database.in the GetInstructorCourseDemo am trying to print the Instructor information with an associated course but inSystem.out.println("Course "+tempinstructor.getCourse()); what I see in the console is Course [MyHibernate.Course#56ccd751, MyHibernate.Course#458544e0] . it seems to me hibernate can read courses from database but it can't show it correctly otherwise have i no idea what can cause this problem
#Entity
#Table(name = "instructor")
public class Instructor {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private int id;
#Column(name ="first_name" )
private String first_name;
#Column(name = "last_name")
private String last_name;
#Column(name = "email")
private String email;
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "instructor_detail_id")
private instructor_detail Instructor_detail;
Instructor(){}
#OneToMany(mappedBy = "instructor",cascade = {CascadeType.DETACH,CascadeType.MERGE,CascadeType.PERSIST,
CascadeType.REFRESH})
private List<Course> course;
public Instructor(String first_name, String last_name, String email) {
this.first_name = first_name;
this.last_name = last_name;
this.email = email;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirst_name() {
return first_name;
}
public void setFirst_name(String first_name) {
this.first_name = first_name;
}
public String getLast_name() {
return last_name;
}
public void setLast_name(String last_name) {
this.last_name = last_name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public instructor_detail getInstructor_detail() {
return Instructor_detail;
}
public void setInstructor_detail(instructor_detail instructor_detail) {
Instructor_detail = instructor_detail;
}
public List<Course> getCourse() {
return course ;
}
public void setCourse(List<Course> course) {
this.course = course;
}
public void add(Course tempciurse){
if(course==null){
course=new ArrayList<>();
}
course.add(tempciurse);
tempciurse.setInstructor(this);
}
public class GetInstructorCourseDemo {
public static void main(String[]args) {
// create session factory
SessionFactory factory = new Configuration()
.configure("hibername.cfg.xml")
.addAnnotatedClass(Instructor.class)
.addAnnotatedClass(instructor_detail.class)
.addAnnotatedClass(Course.class)
.buildSessionFactory();
Session session = factory.getCurrentSession();
try {
session.beginTransaction();
int id=2;
Instructor tempinstructor=session.get(Instructor.class,id);
System.out.println("instructor : "+tempinstructor);
System.out.println("Course "+tempinstructor.getCourse());
session.getTransaction().commit();
System.out.println("Done!");
}
finally {
factory.close();
}
}
}
#Entity
#Table(name = "course")
public class Course {
#Id#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private int id;
#Column(name = "title")
private String title;
#ManyToOne(cascade = {CascadeType.DETACH,CascadeType.REFRESH,CascadeType.MERGE,CascadeType.PERSIST})
#JoinColumn(name = "instructor_id")
private Instructor instructor;
Course(){}
public Course(String title) {
this.title = title;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Instructor getInstructor() {
return instructor;
}
public void setInstructor(Instructor instructor) {
this.instructor = instructor;
}
}

It missed toString() implementation in Instructor and Course types.
As you don't override it the default one is used -->
public String toString() {
return getClass().getName() + "#" + Integer.toHexString(hashCode());
}
NB : take care to not use course and instructor references directly in toString implementation causing a circular reference and so a StackOverflow error.

for solving this issue i have to add toString method in Course, Instructor as following
for Instructor
#Override
public String toString() {
return "Instructor{" +
"id=" + id +
", first_name='" + first_name + '\'' +
", last_name='" + last_name + '\'' +
", email='" + email + '\'' +
", Instructor_detail=" + Instructor_detail +
", course=" + course +
'}';
}
for Course
#Override
public String toString() {
return "Course{" +
"id=" + id +
", title='" + title + '\'' +
'}';
}
what was causing this confusion was that I didn't have toString method and I shouldn't have Instructor filed in my toString method

How to handle message error in Entity when using #MockMvc

I using #MockMvc test in spring controller but i have a question.
How to handle message error when MockMvc test not pass method.
Entity:
#Entity
#ApiModel(description = "All details about the Product")
public class Product {
#Id
#GeneratedValue(strategy = GenerationType.AUTO,generator = "system-uuid")
#GenericGenerator(name = "system-uuid",strategy = "uuid2")
private String id;
#NotNull(message = "name can not null")
#ApiModelProperty(notes = "The name is product")
private String name;
#ApiModelProperty(notes = "The type is product")
private String type;
#NotNull(message = "category can not null")
private String category;
private String description;
private Double prince;
public Product() {
}
public Product(String name, String type, String category, String description, Double prince) {
this.name = name;
this.type = type;
this.category = category;
this.description = description;
this.prince = prince;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Double getPrince() {
return prince;
}
public void setPrince(Double prince) {
this.prince = prince;
}
#Override
public String toString() {
return "Product{" +
"id='" + id + '\'' +
", name='" + name + '\'' +
", type='" + type + '\'' +
", category='" + category + '\'' +
", description='" + description + '\'' +
", prince=" + prince +
'}';
}
}
StudentController:
#RestController
#RequestMapping("/products")
public class ProductController {
#PostMapping
public ResponseEntity<ProductDto> createProduct(#RequestBody Product product) {
URI location = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}").buildAndExpand(product.getId()).toUri();
return ResponseEntity.created(location).body(productService.createProduct(product));
}
}
In above entity, I want using #MockMvc test createProduct. If name in product is null, i want show message in #MockMvc . It look like: "name can not null" . If pass, i don't want show it. Bellow my test:
#Test
public void givenProductURIWithPost_whenMockMVC_thenVerifyResponse() {
this.mockMvc.perform(post("/products")).andDo(print())
.andExpect(status().isOk()).andExpect(content()
.contentType("application/json;charset=UTF-8"))
}
I have two question:
1.How to show message "name can not null" if name in product is
null in #mockmvc.
2. If my project in 20 field in Products entity : Example: name,category.. I can test sequence field in Products or only test
one time contain all field.

What are the most needed things to build a Maven Project with restservice with JPA, spring and unit testing with pom.xml dependencies?

It would be good if someone can post sample codes too! Thanks in advance!
i have tried this code for a bean class,
#Entity
#Table(name = "language")
#JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "#id")
public class Language {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "la_id")
private int id;
#Column(name = "la_name")
private String name;
public Language() {
super();
// TODO Auto-generated constructor stub
}
public Language(int id, String name) {
super();
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
#Override
public String toString() {
return "Language [id=" + id + ", name=" + name + "]";
}
}

Use this spring configurator: Start Spring

Conditional update in Dynamo Db using mapper

I am trying to do a conditional update on a field Score in my table based on the condition that marks to be updated are greater than the current score.
I have written following code ,
StudentDO temp = mapper.load(StudentDO.class, student.getId());
temp.setScore(marks);
ArrayList<AttributeValue> list = new ArrayList<AttributeValue>();
list.add(new AttributeValue().withN(Oldmarks.toString()));
Map<String,ExpectedAttributeValue> expectedAttributes = new
HashMap<String,ExpectedAttributeValue>();
ExpectedAttributeValue expectedAttributeValue = new
ExpectedAttributeValue().withAttributeValueList(list)
.withComparisonOperator("GT");
expectedAttributes.put("Score",expectedAttributeValue);
mapper.save(temp, new DynamoDBSaveExpression().withExpected(expectedAttributes));
This is failing with this runtime exception
com.amazonaws.services.dynamodbv2.model.ConditionalCheckFailedException: The conditional request failed (Service: null; Status Code: 400; Error Code: ConditionalCheckFailedException; Request ID: null)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.amazonaws.services.dynamodbv2.local.embedded.DDBExceptionMappingInvocationHandler.handleDynamoDBLocalServiceException(DDBExceptionMappingInvocationHandler.java:87)
at com.amazonaws.services.dynamodbv2.local.embedded.DDBExceptionMappingInvocationHandler.invoke(DDBExceptionMappingInvocationHandler.java:66)
at com.sun.proxy.$Proxy19.updateItem(Unknown Source)
at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper$SaveObjectHandler.doUpdateItem(DynamoDBMapper.java:854)
at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper$2.executeLowLevelRequest(DynamoDBMapper.java:594)
at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper$SaveObjectHandler.execute(DynamoDBMapper.java:733)
at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper.save(DynamoDBMapper.java:623)
at com.amazonaws.services.dynamodbv2.datamodeling.AbstractDynamoDBMapper.save(AbstractDynamoDBMapper.java:128)
I am not able to debug why is it throwing Conditional Check Failed Exception.
I could make out the request is not properly formed , but not sure where is it malformed ?
I have tried to align it to these docs
http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/dynamodbv2/datamodeling/DynamoDBSaveExpression.html
http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/dynamodbv2/model/ExpectedAttributeValue.html
http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/dynamodbv2/model/AttributeValue.html
My DB schema is this
#DynamoDBTable(tableName = "Student")
public class StudentDO {
#DynamoDBHashKey(attributeName = "Id")
private Integer id;
#DynamoDBAttribute(attributeName = "Name")
private String name;
#DynamoDBAttribute(attributeName = "Score")
private Integer score;
#Override
public String toString() {
return "Student [Name=" + name + ", id=" + id + ", score=" + score + "]";
}
}

Each DynamoDB attribute must have a public getter and setter, since DynamoDBMapper works on JavaBeans (a class with a no argument constructor, and getters + setters for each private var). Modify your class to this:
#DynamoDBTable(tableName = "Student")
public class StudentDO {
private Integer id;
private String name;
private Integer score;
#DynamoDBAttribute(attributeName = "Id")
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
#DynamoDBAttribute(attributeName = "Name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
#DynamoDBAttribute(attributeName = "Score")
public Integer getScore() {
return score;
}
public void setScore(Integer score) {
this.score = score;
}
#Override
public String toString() {
return "Student [Name=" + name + ", id=" + id + ", score=" + score + "]";
}
}

java - Hibernate doesn't read object from database correctly

I am having some issues according Hibernate.
I have a more or less complex object structure that I want to save / load using the Hibernate EntityManager (version 4.3.5.Final). I managed to save it, but if I attempt to read the obejct, only the PK will be read. The EntityManager's find method returns null even with the correct PK so I am using its getReference method.
I still have troubles using the correct relationship (ManyToOne and such) so I most likely made a mistake there and I guess that is causing the problem.
Anyways.
My question is: How do i persist an object structure like this using Hibernate?
Here are the POJOs i am using:
EDIT: Updated the Code
CalculationList:
#Entity(name = "calculation")
public class CalculationList implements EntityList {
#Id
private Date created;
#OneToMany(mappedBy = "", fetch = FetchType.EAGER, cascade = CascadeType.ALL)
private List<Product> products;
public CalculationList(Date created) {
this.created = created;
this.products = new LinkedList<>();
}
public CalculationList(Date created, List<Product> products) {
this.created = created;
this.products = products;
}
public CalculationList() {
}
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
public List<Product> getProducts() {
return products;
}
public void setProducts(List<Product> entities) {
this.products = entities;
}
#Override
public String toString() {
return "CalculationList{" +
"created=" + created +
", products=" + products +
'}';
}
}
CalulatorEntity:
#Entity(name = "calculator_entity")
public class CalculatorEntity implements Serializable {
#Id
private int id;
private CalculatorEntityType type;
private String name;
private int number;
#ManyToOne(cascade = CascadeType.ALL)
private Product product;
public CalculatorEntity(CalculatorEntityType type) {
this.type = type;
}
protected CalculatorEntity() {
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public Product getProduct() {
return product;
}
public void setProduct(Product product) {
this.product = product;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public CalculatorEntityType getType() {
return type;
}
public void setType(CalculatorEntityType type) {
this.type = type;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public enum CalculatorEntityType {
GAS_PUMP, DELIVERY_BILL;
}
#Override
public String toString() {
return "CalculatorEntity{" +
"id=" + id +
", type=" + type +
", name='" + name + '\'' +
", product=" + product +
", number=" + number +
'}';
}
}
Product:
#Entity(name = "product")
public class Product implements Serializable {
#Id
private int id;
private String name;
private ProductType type;
#OneToMany(mappedBy = "product", fetch = FetchType.EAGER, cascade = CascadeType.ALL)
private List<CalculatorEntity> entities;
public Product(String name, ProductType type) {
this.name = name;
this.type = type;
this.entities = new LinkedList<>();
}
/**
* JPA - Konstruktor
*/
public Product() {
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public ProductType getType() {
return type;
}
public void setType(ProductType type) {
this.type = type;
}
public List<CalculatorEntity> getEntities() {
return entities;
}
public void setEntities(List<CalculatorEntity> entities) {
this.entities = entities;
}
#Override
public String toString() {
return "Product{" +
"id=" + id +
", name='" + name + '\'' +
", type=" + type +
", entities=" + entities +
'}';
}
public enum ProductType {
FUEL("Treibstoff"), OIL("Öl"), OTHER("Verschiedenes");
private String name;
private ProductType(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
}
}

You are using the #OneToMany mapping with the wrong entity, instead of mapping Product class you are mapping CalculationList class, move the following configuration:
#OneToMany(mappedBy = "product", fetch = FetchType.EAGER, cascade = CascadeType.ALL)
private List<CalculatorEntity> entities;
to the Product class.