Hibernate One-to-many Could Not Initialise Collection

I have two database tables, User and PageComment. Using Hibernate, I'm trying to store a Set of PageComment objects in the User comment (comments made to that user), by using one-t

Solution 1:

I spot that there are some problems in the relationship mapping

HBM For User Table:

 <set name="commentsMadeTo" inverse="true">
        <key column="XXXXXXXX"/>
        <one-to-many class="PageComment"/>
  </set>

HBM For PageComment:

<many-to-one name="userMadeTo" column="XXXXXXX" not-null="true" class="User" />

The value XXXXX represents the column name on the "many" side (i.e PageComment table in your case) that associates to its "One" side. It should have the same value in both mapping hbm.

Try to change the hbm for user table to:

<set name="commentsMadeTo" inverse="true">
    <key column="Username"/>
    <one-to-many class="PageComment"/>
</set>