[jboss-user] [EJB 3.0] - unidirectional Many-To-Many relationships
When trying to model unidirectional M-t-M relations I get a
org.hibernate.MappingException.
I tried the example from Mastering EJB3.0 from Wiley Publishing:
| @Entity(name="CourseUni")
| public class Course implements Serializable {
| private int id;
| private String courseName;
|
| private Collection<Student> students = new ArrayList<Student>();
|
| public Course() { id = (int)System.nanoTime(); }
|
| @Id
| public int getId() { return id; }
|
| public void setId(int id) { this.id = id;}
|
| public String getCourseName() { return courseName;}
|
| public void setCourseName(String courseName) {
| this.courseName = courseName;
| }
|
| public Collection<Student> getStudents() {
| return students;
| }
|
| public void setStudents(Collection<Student> students) {
| this.students = students;
| }
| }
|
| @Entity(name="StudentUni")
| public class Student implements Serializable {
| private int id;
| private String name;
| private Collection<Course> courses = new ArrayList<Course>();
|
| public Student() { id = (int)System.nanoTime(); }
|
| @Id
| 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; }
|
| @ManyToMany(cascade={CascadeType.ALL},fetch=FetchType.EAGER)
| @JoinTable(name="STUDENTUNI_COURSEUNI")
| public Collection<Course> getCourses() {
| return courses;
| }
|
| public void setCourses(Collection<Course> courses) {
| this.courses = courses;
| }
|
|
When deploying this on JBOSS-4.0.5.GA following Exception is thrown:
:49:41,641 DEBUG [org.jboss.ejb3.ServiceDelegateWrapper] Starting failed
persistence.units:jar=tutorial.jar,unitName=tempdb
| javax.persistence.PersistenceException: org.hibernate.MappingException: Could not
determine type for: java.util.Collection, for columns:
[org.hibernate.mapping.Column(students)]
|
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