Dear Members

I have the table Product and I need work with Map<k,Set<Item>> x variable for such class, in the Set collection Item is a class/table where each row inserted can be of many types like

Alfa(alfa1 ... alfaN)

• alfa1
• alfa2
• alfa3
• alfa4
• ...
• alfaN

Beta(beta1 ... betaN )

• beta1
• beta2
• beta3
• beta4

Delta (delta1 ... deltaN)

• delta1
• delta2
• delta3
• delta4

Then a Product is created for many Item's (alfa,beta,delta), imagine like ingredients to cook a cake

The point is that each Set<Item> collection (alfa,beta,delta) creates a Product therefore think

product1 has

1. alfa1
2. alfa2

1. beta1
2. beta2
3. beta3

1. delta1
2. delta2
3. delta3
4. delta4

The point would be has the follow

x.put("alfa", Set<Item> of type alfa 1..2)
x.put("beta", Set<Item> of type beta 1..3)
x.put("delta",Set<Item> of type delta 1..4)

therefore how I could do this mapping to persistence the Set within the Hash collection?
I work with annotations, how should be the XML generated?

Thanks in advanced

Hi Dr Pompeii,

Have a look at the blog:

http://blog.xebia.com/2007/10/05/mappin ... hibernate/

In this blog a map of lists is used. I belive you can use sets (have a look at http://commons.apache.org/collections/a ... ueMap.html there you can specify which type of collection you want to use).

Unfortunately I could not find how to annotate collection with UserCollectionType as it is not supported in hibernate annotations. But it can be set programmatically at a configuration stage.

Hope it helps.
Anton

Hello aantoxa

Thanks for the reply, interesting link, but such code has a problem
1) something complicated
2) depends with MultiValueMap where has a note its API
Note that MultiValueMap is not synchronized and is not thread-safe
I need this for many users in real time

Anyway I found a solution with a re design

My Best Regards!!!

-Manuel