I am trying to setup my first Java Hibernate project and decided to follow the instructions on this YouTube video: https://www.youtube.com/watch?v=QJddHc41xrM&t=535s I made it to #08:50 where "jpa" was entered and the entitymanager setup was compiled. I can't get intellij to recognize this input and compile the code like in the video. What would be the next step to get this application working so I can simply enter 1 row into my database. Attached to this question are pictures of my class file setup and structure. I will also attach code to show how my entities, pom.xml, and persistence.xml file is setup. My main class that would start the transaction is empty and I want to know how I can make this work or what additional information I need to make it work. Any help would be much appreciated.
The code below is from my pom.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>HibernateJPA</artifactId>
<version>1.0-SNAPSHOT</version>
<name>HibernateJPA</name>
<packaging>war</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.target>11</maven.compiler.target>
<maven.compiler.source>11</maven.compiler.source>
<junit.version>5.9.1</junit.version>
</properties>
<dependencies>
<dependency>
<groupId>jakarta.servlet</groupId>
<artifactId>jakarta.servlet-api</artifactId>
<version>5.0.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.hibernate.orm</groupId>
<artifactId>hibernate-core</artifactId>
<version>6.0.2.Final</version>
</dependency>
<dependency>
<groupId>org.glassfish.jaxb</groupId>
<artifactId>jaxb-runtime</artifactId>
<version>3.0.2</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<version>8.0.32</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.2</version>
</plugin>
</plugins>
</build>
</project>
The code below is from my persistence.xml file:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence xmlns="https://jakarta.ee/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence https://jakarta.ee/xml/ns/persistence/persistence_3_0.xsd"
version="3.0">
<persistence-unit name="default">
<class>entity.EmployeeEntity</class>
<properties>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/testDB"/>
<property name="hibernate.connection.driver_class" value="com.mysql.cj.jdbc.Driver"/>
<property name="hibernate.connection.username" value="root"/>
<property name="hibernate.connection.password" value=""/>
</properties>
</persistence-unit>
</persistence>
The code below is from my Entity Employee class:
package entity;
import jakarta.persistence.*;
import java.util.Objects;
#Entity
#Table(name = "employee", schema = "testdb", catalog = "")
public class EmployeeEntity {
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Id
#Column(name = "id")
private int id;
#Basic
#Column(name = "first_name")
private String firstName;
#Basic
#Column(name = "last_name")
private String lastName;
#Basic
#Column(name = "salary")
private Integer salary;
public int getId() {
return id;
}
public void setId(int 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;
}
public Integer getSalary() {
return salary;
}
public void setSalary(Integer salary) {
this.salary = salary;
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
EmployeeEntity that = (EmployeeEntity) o;
return id == that.id && Objects.equals(firstName, that.firstName) && Objects.equals(lastName, that.lastName) && Objects.equals(salary, that.salary);
}
#Override
public int hashCode() {
return Objects.hash(id, firstName, lastName, salary);
}
}
Related
I am using Spring Boot and the #NotNull is not working. When the name value is not provided the function runs fine.
#Entity
public class Employee implements Serializable{
#Id
//#GeneratedValue(strategy=GenerationType.AUTO)
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
//#Id
public void setName(String name) {
this.name = name;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
#NotNull // not working
private String name;
private String phone;
}
the controller is
#Controller
public class URLController {
#Autowired
EmployeeServiceImpl empService;
#GetMapping({"/", "/index"})
public String index1(Model model){
model.addAttribute("employee",new Employee());
return "index";
}
#PostMapping("/result")
public String result(#Valid #ModelAttribute Employee employee){
System.out.print(employee.getName());
empService.save(employee);
return "result";
}
}
pom.xml
http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0
<groupId>com.springs</groupId>
<artifactId>springs</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springs</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
i am using the model attribute to get the employee object. the pom.xml file contains the hibernate validator dependency.
you must add #Valid annotaion in mapping part in your code for example
void addEmployee(#Valid Employee emp);
using this import "import javax.validation.Valid;"
Another note if you want to validate List you must make a wrapper list
Like
public class ValidList<E> implements List<E> {
#Valid
private List<E> list;}
And override all methods in it
Try modifying method like below to check details about errors.
#PostMapping("/result")
public String result(#Valid #ModelAttribute("employee") Employee employee, BindingResult bindingResult){
List<FieldError> errors = bindingResult.getFieldErrors();
for (FieldError error : errors ) {
System.out.println (error.getObjectName() + " - " +error.getDefaultMessage());
}
System.out.print(employee.getName());
empService.save(employee);
return "result";
}
If no error in bindingResult then refer notnull-constraint-not-working to troubleshoot further.
I'm new in jpa and hibernate, and it took me a while to set up the xml file(it might not be whole), lower the errors, and try to figure it all out. I'm using mariadb and have a database called jpadb, which im trying create and pass an "Employee" object from java. I get the error
:org.hibernate.PersistentObjectException: detached entity passed to
persist: model.Employee
my code is as follows:
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="sample" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>model.Employee</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.mariadb.jdbc.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mariadb://localhost:3306/jpadb" />
<property name="javax.persistence.jdbc.user" value="root" />
<property name="javax.persistence.jdbc.password" value="root" />
</properties>
</persistence-unit>
</persistence>
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>sqlDemo</groupId>
<artifactId>demo</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>loader.MainApp</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.mariadb.jdbc</groupId>
<artifactId>mariadb-java-client</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.17.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>5.2.17.Final</version>
</dependency>
</dependencies>
</project>
Employee.java
package model;
import javax.persistence.*;
#Entity
#Table (name="user")
public class Employee {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
private int eid;
#Column(name = "ename")
private String ename;
#Column(name = "salary")
private double salary;
#Column(name = "deg")
private String deg;
public Employee(int eid, String ename, double salary, String deg) {
super( );
this.eid = eid;
this.ename = ename;
this.salary = salary;
this.deg = deg;
}
public Employee( ) {
super();
}
public int getEid( ) {
return eid;
}
public void setEid(int eid) {
this.eid = eid;
}
public String getEname( ) {
return ename;
}
public void setEname(String ename) {
this.ename = ename;
}
public double getSalary( ) {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
public String getDeg( ) {
return deg;
}
public void setDeg(String deg) {
this.deg = deg;
}
#Override
public String toString() {
return "Employee [eid=" + eid + ", ename=" + ename + ", salary=" + salary + ", deg=" + deg + "]";
}
}
CreateEmployee.java
package service;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import model.Employee;
public class CreateEmployee {
public static void main( String[ ] args ) {
EntityManagerFactory emfactory = Persistence.createEntityManagerFactory( "sample" );
EntityManager entitymanager = emfactory.createEntityManager( );
entitymanager.getTransaction( ).begin( );
Employee employee = new Employee( );
employee.setEid( 1201 );
employee.setEname( "Maria" );
employee.setSalary( 40000 );
employee.setDeg( "Technical Manager" );
entitymanager.persist( employee );
entitymanager.getTransaction( ).commit( );
entitymanager.close( );
emfactory.close( );
}
}
I'm trying to go through tutorials, but due to hibernate-property version mismatches I'm having a really hard time. It took me a while to find the properties for mariadb in order for this to work. Thanks in advance.
set #GeneratedValue(strategy=GenerationType.IDENTITY) and remove the line employee.setEid( 1201 );
Your id is auto generated, you don't have to pass it when inserting a new row.
Remove the line employee.setEid( 1201 ); and it should do it. You should take a look at entity lifecycle. https://www.javabullets.com/jpa-entity-lifecycle/
I'm trying to generate table using JPA. but i can't create it. There is no error in the code, but it seems that there is configuration error. but i can't find it, i tried many configurations but nothing happen.
Thanks a lot.
This is application.property:
spring.datasource.url=jdbc:mysql://localhost:3306/springapp
spring.datasource.username= root
spring.datasource.password= me
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.hibernate.ddl-auto=create
this is my class:
#Entity
public class Customer {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private int id;
private String name;
private String phone;
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 String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public Customer(String name, String phone) {
super();
this.name = name;
this.phone = phone;
}
public Customer() {
super();
}
}
This is the application:
#SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
And this is the controller:
#RestController
#RequestMapping("/customer")
public class CustomerController {
#Autowired
CustomerRepository customerRepository;
#RequestMapping("/findall")
#ResponseBody
public List<Customer> findAll() {
return customerRepository.findAll();
}
}
Pom.xml
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>GStock-3</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>GStock-3</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Try to add #EntityScan
#EntityScan("<package with entities>")
#SpringBootApplication
public class Application { ... }
With the current information I have a couple of suggestions / Questions that might help you allong:
Does the "springapp" database exist with the correct user (root) and password (me) assigned to it in MySQL
Has MySQL been started?
I see no #Repository definition in your code e.g.
#Repository
public interface CustomerRepository extends JpaRepository{}
execute following on your mysql:
mysql> create database db_example; -- Create the new database
mysql> create user 'springuser'#'localhost' identified by 'ThePassword'; -- Creates the user
mysql> grant all on db_example.* to 'springuser'#'localhost'; -- Gives all the privileges to the new user on the newly created database
and add into application.xml:
spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost:3306/db_example
spring.datasource.username=springuser
spring.datasource.password=ThePassword
OR
you can go through this link
I am trying to generate schema tables based on entities. The application starts correctly, the SQL is generated but there is no result - none of tables are created. What's wrong? I have used the same settings in plain Spring MVC + Hibernate JPA without Spring Boot and everything was working correctly.
Here is my pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.agileplayers</groupId>
<artifactId>applicationname</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>ApplicationName</name>
<description>Application Name</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<!--<scope>runtime</scope>-->
<version>9.4-1201-jdbc41</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
application.properties:
spring.datasource.url = jdbc:postgresql://localhost:5432/postgres
spring.datasource.driverClassName = org.postgresql.Driver
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQL82Dialect
spring.datasource.schema=schemaName
spring.datasource.username=userName
spring.datasource.password=userPassword
spring.jpa.hibernate.ddl-auto=create
spring.jpa.show-sql=true
spring.jpa.generate-ddl=true
BaseEntity.java:
package com.agileplayers.applicationname.core.domain;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import java.util.Date;
#MappedSuperclass
public class BaseEntity {
#Id
#GeneratedValue
private int id;
private Date createdOn;
public String description;
public BaseEntity() {
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public Date getCreatedOn() {
return createdOn;
}
public void setCreatedOn(Date createdOn) {
this.createdOn = createdOn;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
example of Entity which extends BaseEntity - Entry.java:
package com.agileplayers.applicationname.core.domain;
import javax.persistence.Entity;
import javax.persistence.ManyToOne;
import java.util.Date;
#Entity
public class Entry extends BaseEntity{
private String type;
#ManyToOne
private Account account;
public Entry() {
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public Account getAccount() {
return account;
}
public void setAccount(Account account) {
this.account = account;
}
}
I have fixed the issue. Instead of spring.datasource.schema=schemaName there should be spring.jpa.properties.hibernate.default_schema=schemaName.
The set of necessary properties required for generating tables in my case is the following:
spring.datasource.url = jdbc:postgresql://localhost:5432/postgres
spring.jpa.properties.hibernate.default_schema = schemaName
spring.datasource.username = userName
spring.datasource.password = userPassword
spring.jpa.hibernate.ddl-auto = create-drop
spring.jpa.show-sql = true
Utilising the Java JPA with Eclipse Link I am attempting to persist a simple Post model of a Blog application into a MySQL database however I am recieving the error No Persistence provider for EntityManager named
Here is the code I am utilising
Exception Text
javax.persistence.PersistenceException: No Persistence provider for
EntityManager named blog
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:85)
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
com.uk.jacob.blog.controllers.PostController.(PostController.java:9)
com.uk.jacob.blog.controllers.HomeController.doGet(HomeController.java:51)
javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
App Structure
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.uk.jacob</groupId>
<artifactId>blog</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>Jacob Clark Blog</name>
<description>A blog for jacob.uk.com</description>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa</artifactId>
<version>2.6.0-M3</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.33</version>
</dependency>
</dependencies>
</project>
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="blog" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>uk.com.jacob.blog.models.Post</class>
<properties>
<property name="javax.persistence.jdbc.url"
value="jdbc:mysql://localhost:3306/jpadb"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="javax.persistence.jdbc.password" value="root"/>
<property name="javax.persistence.jdbc.driver"
value="com.mysql.jdbc.Driver"/>
<property name="eclipselink.logging.level" value="FINE"/>
<property name="eclipselink.ddl-generation"
value="create-tables"/>
</properties>
</persistence-unit>
</persistence>
Post Bean
package com.uk.jacob.blog.models;
import java.util.Date;
import javax.persistence.*;
#Entity
public class Post {
#Id
private int _id;
private String _title;
private String _author;
private String _body;
private Date _published;
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 String getAuthor() {
return _author;
}
public void setAuthor(String _author) {
this._author = _author;
}
public String getBody() {
return _body;
}
public void setBody(String _body) {
this._body = _body;
}
public Date getPublished() {
return _published;
}
public void setPublished(Date _published) {
this._published = _published;
}
}
Post Controller
package com.uk.jacob.blog.controllers;
import javax.persistence.*;
import com.uk.jacob.blog.models.Post;
public class PostController {
private EntityManagerFactory emf = Persistence.createEntityManagerFactory("blog");
private EntityManager em = emf.createEntityManager();
private EntityTransaction tx = em.getTransaction();
public Post createPost(Post post){
tx.begin();
em.persist(post);
tx.commit();
return post;
}
public Post getPost(int id){
return em.find(Post.class, id);
}
public void removePost(Post post){
em.remove(em.merge(post));
}
public void updatePost(Post post){
tx.begin();
Post postToBeUpdated = em.merge(post);
tx.commit();
}
}
It's because of you don't have eclipselink dependency in your pom.xml. Also
You don't need
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa</artifactId>
<version>2.6.0-M3</version>
</dependency>
just
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.4.2</version>
</dependency>
is enough (version may change)