Hi everyone!
I will try to explain my problem.

I´ve got a page that shows the details of a category (it was made by seam-gen).
The problem is that every category on the system got houndreds of products, so the seam gen shows it on a very long data table.

So to fix that i made by hand methods to manage de grid like: getNext(), getPrevious(), etc. And i put those methods on the categoryHome.
I have to put in it a variable int who is the number of the page, but categoryHome is stateless, so i´m trying to do it statefull with scope conversation.

I have to implement methods of the entityHome and Home classes, but i still have an exception which says:

Caused by: java.lang.IllegalArgumentException: id to load is required for loading

This is the interface which implements categoryHome:

@Local
public interface CategoryHomeRemote {

      public void create();
         
      public void destroy();
      
      public void queryProducts();
      
      public void setCategoryId(Integer id);
      
      public Integer getCategoryId();
      
      public Category getDefinedInstance();
      
      public void wire();
      
      public boolean isWired();
      
      public Category find();
      
      public List<CategoryDiscounts> getCategoryDiscounts();
      
      public List<SubCategories> getSubCategories();
      
      public void nextPage();
      
      public void previousPage();
      
      public boolean isNextPageAvailable();
      
      public boolean isPreviousPageAvailable();
      
      public int getPageSize();
      
      public void setPageSize(int pageSize);
      
      public void setInstance(Category instance);
      
      public Category getInstance();
      
}

So, i need someone who has a better idea to save that number of page, or someone who has idea where i am wrong!

Thanx in advice guys!
I really need this help!