我试图保持简单的双向一对多关系,但是使用eclipse链接2.7.4失败。下面是示例代码。
@Entity(name = "Department")
@Table(name = "department")
@XmlAccessorType(XmlAccessType.NONE)
@Cacheable(false)
@XmlRootElement(name = "Department")
public class Department {
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Id
@XmlElement(name = "id")
private long id;
@OneToMany(targetEntity = Employee.class, cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
@JoinColumn(name = "dept_id")
@XmlElement(name = "employees", type = Employee.class)
private List<Employee> employees;
@Version
@XmlElement(name = "version")
private long version;
public long getVersion() {
return this.version;
}
public long getId() {
return this.id;
}
public void setId(final long id) {
this.id = id;
}
public List<Employee> getEmployees() {
return employees;
}
public void setEmployees(List<Employee> employees) {
this.employees = employees;
}
}
@Entity(name = "Employee")
@Table(name = "employee")
@XmlAccessorType(XmlAccessType.NONE)
@XmlRootElement(name = "Employee")
public class Employee {
public Employee() {
super();
}
/**
* The id.
*/
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Id
@XmlElement(name = "id")
private long id;
@ManyToOne(optional = false, targetEntity = Department.class, fetch = FetchType.LAZY)
@JoinColumn(name = "dept_id", referencedColumnName = "id", nullable = false)
private Department department;
@Version
@XmlElement(name = "version")
private long version;
public long getVersion() {
return this.version;
}
public Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
}
public class Test {
private static final String PERSISTENCE_UNIT_NAME = "pun";
private static EntityManagerFactory factory;
public static void main(String[] args) {
factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
EntityManager em = factory.createEntityManager();
em.getTransaction().begin();
Department department = new Department();
List<Employee> dists = new ArrayList<>();
Employee emp1 = new Employee();
emp1.setDepartment(department);
dists.add(emp1);
Employee emp2 = new Employee();
emp2.setDepartment(department);
dists.add(emp2);
department.setEmployees(dists);
em.persist(department);
em.getTransaction().commit();
em.close();
}
}
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="pun" transaction-type="RESOURCE_LOCAL">
<!-- <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> -->
<class>demo.eclipselink.error.Department</class>
<class>demo.eclipselink.error.Employee</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" />
<property name="javax.persistence.jdbc.url"
value="jdbc:derby:/databases/simpleDb;create=true" />
<property name="javax.persistence.jdbc.user" value="test" />
<property name="javax.persistence.jdbc.password" value="test" />
<!-- EclipseLink should create the database schema automatically -->
<property name="eclipselink.ddl-generation" value="create-tables" />
<property name="eclipselink.ddl-generation.output-mode" value="database" />
<property name="eclipselink.logging.level.sql" value="FINE"/>
<property name="eclipselink.logging.parameters" value="true"/>
</properties>
</persistence-unit>
</persistence>
一旦我使用Eclipse Link 2.7.4运行代码,它就会为我提供以下异常堆栈跟踪。
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.7.4.v20190115-ad5b7c6b2a): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLSyntaxErrorException: Column name 'DEPT_ID' appears more than once times in the column list of an INSERT statement.
Error Code: 20000
Call: INSERT INTO employee (dept_id, id, VERSION, dept_id) VALUES (?, ?, ?, ?)
bind => [1, 0, 1, 1]
我无法在2.7.3版中重现此问题,并且仅在2.7.4版中失败。我们正在将eclipse链接与Payara 5.191一起使用,并且此问题也存在。
请让我们知道是否可以解决。
谢谢
答案 0 :(得分:1)