TransientObjectException: object references an unsaved transient instance

[Shajid Johnny]

Dear members,

I am new to Hibernate.
I have been trying to build an application that has the modules: Add/Edit/Delete of Categories, SubCategories, Articles.

SubCategory has a Many-to-one association with Category and Article has a many-to-one association with SubCategory.

here is the hbm.xml files:

SubCategory.hbm.xml

   
<many-to-one name="category"  class="com.foo.bar.entity.Category" lazy="false"
		column="category" />
 

Article.hbm.xml

    
<many-to-one name="subCategory" class="com.foo.bar.entity.SubCategory" lazy="false"
		column="subCategory" />

Thus I have done the unidirectional many-to-one associations.
Now, I can successfully Add/Edit/Delete both Category and SubCategory, but when I try to add an Article, it displays the following Exception:
javax.servlet.ServletException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before fl

could you please give me a solution to the problem??

[Ankit Garg]

Can you show us the code which is throwing the exception. Is the SubCategory object which the Article references to saved in the database??