[jboss-jira] [JBoss JIRA] Commented: (EJBTHREE-1188) Deployment of @ManyToMany fails.

[Emmanuel Bernard (JIRA)]

    [ http://jira.jboss.com/jira/browse/EJBTHREE-1188?page=comments#action_12398073 ] 
            
Emmanuel Bernard commented on EJBTHREE-1188:
--------------------------------------------

can you post a minimal reproducible test case? Make it as minimal as possible, I'm pretty sure you will find an error on your side during that journey.

> 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;
>     }
> }

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