problem in one-to-many mapping

[indu iyengar]

Hi all,

am trying to store an object by using one-to-many relationship ...
it shows the exception as

IllegalArgumentException in class: com.bean.Course, getter method of property: courseID

basic relationship is ::

one student can join in multiple courses...

code for course

public class Course 
{
   private String courseID;
   private EnrollStudent ec;
   
   public EnrollStudent getEc() {
	return ec;
}
public void setEc(EnrollStudent ec) {
	this.ec = ec;
}
	public void setCourseID(String courseID)
	{
		this.courseID = courseID;
	}
	public String getCourseID()
	{
		return courseID;
	}
	   
}

code for student

public class EnrollStudent
{
		private long stid;
		private List<String> courses;
		
		public long getStid() {
			return stid;
		}
		public void setStid(long stid) {
			this.stid = stid;
		}
		public List<String> getCourses() {
			return courses;
		}
		public void setCourses(List<String> courses) {
			this.courses = courses;
		}
		
}

mapping file

 <class name="EnrollStudent" table="ec">
    <id name="stid" column="studID"></id>
    <list name="courses" cascade="all">
      <key column="parent_id"></key>
      <index column="idx"></index>
      <one-to-many class="Course"/>
    </list>
  </class>
  
  <class name="Course" table="courses">
     <id name="courseID" column="courseID"></id>
  </class>
  
</hibernate-mapping>

please let me know what is wrong with my code ?

[joy b chakravarty]

private List<String> courses;

shouldn't this be

private List<Course> courses;

[Waswani Naresh]

Hi Indu,

As Joy mentioned , change the List<String> to List<Course> and it will solve your problem.

Regards,
Naresh

[indu iyengar]

Thanks guys for your replies.. I just changed as you said..

now , its not showing any exception..coming to success page without storing .

here am posting my hbm file and code to store the object..

<hibernate-mapping package="com.bean">

  <class name="EnrollStudent" table="ec">
    <id name="stid" column="studID"></id>
    <list name="courses" cascade="all">
      <key column="parent_id"></key>
      <index column="idx"></index>
      <one-to-many class="Course"/>
    </list>
  </class>
  
  <class name="Course" table="courses">
     <id name="courseID" column="courseID">
      </id>
   </class>
</hibernate-mapping

public void store(EnrollStudent ec)
	{
		Session session = sessionFactory.openSession();
		Transaction tx = session.beginTransaction();
		
		try
		{
			System.out.println("process of storing...");
			session.save(ec);
			System.out.println("B4 COMMIT");                      /// this line is not printing //
			tx.commit();
			System.out.println("+++++++++ COMMITTED +++++++++++ ");  //this line is also not printing ////
		}
		catch(Exception e)
		{
			tx.rollback();
		}
		finally
		{
			session.close();
		}

[indu iyengar]

Please help me friends.. didn't resolved yet..

I don't know exactly how to write the .hbm file for relationships..