Deployment of @ManyToMany fails. -------------------------------- Key: EJBTHREE-1188 URL: http://jira.jboss.com/jira/browse/EJBTHREE-1188 Project: EJB 3.0 Issue Type: Bug Components: EJB3 Extensions Affects Versions: AS 4.2.1.GA Environment: JBoss Bootstrap Environment JBOSS_HOME: C:\jboss-4.2.1.GA JAVA: C:\Program Files\Java\jdk1.5.0_09\bin\java JAVA_OPTS: -Dprogram.name=run.bat -server -Xms128m -Xmx512m -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 CLASSPATH: C:\Program Files\Java\jdk1.5.0_09\lib\tools.jar;C:\jboss-4.2.1.GA\bin\run.jar Reporter: Alexander Tsirel Two entities relates as many to many (Course and Student). During deployment it throws: Caused by: org.hibernate.MappingException: Could not determine type for: java.util.Collection, for columns: org.hibernate.mapping.Column(students)] Both sides using Generics. Here is the latest code: @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 public Collection<Course> getCourses() { return courses; } public void setCourses(Collection<Course> courses) { this.courses = courses; } } @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; } @ManyToMany(mappedBy = "courses") public Collection<Student> getStudents() { return students; } public void setStudents(Collection<Student> students) { this.students = students; } } -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira