I try to run a basic application with hibernate and jpa, but now I'm stuck on this exception when running app...Here's the code and erro below:
java.lang.IllegalArgumentException: Not an entity: class pka.EclipseJPAExample.domain.Employee
at org.hibernate.ejb.metamodel.MetamodelImpl.entity(MetamodelImpl.java:158)
at org.hibernate.ejb.criteria.QueryStructure.from(QueryStructure.java:136)
at org.hibernate.ejb.criteria.CriteriaQueryImpl.from(CriteriaQueryImpl.java:177)
at pka.EclipseJPAExample.jpa.JpaTest.createEmployees(JpaTest.java:47)
at pka.EclipseJPAExample.jpa.JpaTest.main(JpaTest.java:33)
JpaTest.java:
public class JpaTest {
private EntityManager manager;
public JpaTest(EntityManager manager) {
this.manager = manager;
}
/**
* @param args
*/
public static void main(String[] args) {
EntityManagerFactory factory = Persistence.createEntityManagerFactory("persistenceUnit");
EntityManager manager = factory.createEntityManager();
JpaTest test = new JpaTest(manager);
EntityTransaction tx = manager.getTransaction();
tx.begin();
try {
test.createEmployees();
} catch (Exception e) {
e.printStackTrace();
}
tx.commit();
test.listEmployees();
System.out.println(".. done");
}
private void createEmployees() {
CriteriaBuilder builder = manager.getCriteriaBuilder();
CriteriaQuery<Employee> query = builder.createQuery(Employee.class);
query.from(Employee.class);
int numOfEmployees = manager.createQuery(query).getResultList().size();
if (numOfEmployees == 0) {
Department department = new Department("java");
manager.persist(department);
manager.persist(new Employee("Jakab Gipsz",department));
manager.persist(new Employee("Captain Nemo",department));
}
}
private void listEmployees() {
CriteriaBuilder builder = manager.getCriteriaBuilder();
CriteriaQuery<Employee> query = builder.createQuery(Employee.class);
query.from(Employee.class);
List<Employee> resultList = manager.createQuery(query).getResultList();
for (Employee next : resultList) {
System.out.println("next employee: " + next);
}
}
}
and persistence.xml:
....<persistence-unit name="persistenceUnit" transaction-type="RESOURCE_LOCAL">
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/testowa" />
<property name="javax.persistence.jdbc.user" value="root" />
<property name="javax.persistence.jdbc.password" value="enchantsql" />
<property name="hbm2ddl.auto" value="create" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
</properties>
</persistence-unit>....
Could you point where is the problem?
EDIT: I forgot to paste Employee class...so here it is below:
@Entity
@Table(name="Employee")
public class Employee {
@Id
@GeneratedValue
private Long id;
private String name;
@ManyToOne
private Department department;
public Employee() {}
public Employee(String name, Department department) {
this.name = name;
this.department = department;
}
public Employee(String name) {
this.name = name;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
@Override
public String toString() {
return "Employee [id=" + id + ", name=" + name + ", department="
+ department.getName() + "]";
}
}
As you can see it is mapped.
Make sure @Entity
annotation in your entity. You also need to configure an entity in persistence.xml
<persistence-unit name="persistenceUnit" transaction-type="RESOURCE_LOCAL">
<class>pka.EclipseJPAExample.domain.Employee</class>
If you have numerous ENTITY classes in your application, adding an entry for every entity in "persistence.xml" won't be a good choice.
Instead, create your own data source bean using Custom AutoConfiguration.
Use LocalContainerEntityManagerFactoryBean inside dataSource bean Creation method.
Here, you need to define
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new
LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setPackagesToScan("org.springframework.boot.entities");
This package is the location where all entity classes have been saved. Thus no need to define every single entry for Entity classes at "persistence.xml".
Prefer Spring-based Scanning.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.