Hi,

It seem that the <index> tag of a collection requires a numeric field. It accepts the "type" attribute but seems to ignore it.

This is valid according to the DTD:


But it casts the the followinf exception:


Am I doing something wrong here or is this a known issue.

Regards,
-Stefan

Sorry, but what else should the index type of a List be? Maybe you are looking for <map>?

I guess you are right but it's by no means obvious (at least not to me). I thought I would get a ordered list back and since I'm implimenting that interface in my POJO beans I thought I could use that directly.

Thank you for your prompt response. I wil impliment the the correct way.

Best regards,
-Stefan

Hum, it should be obvious that a Java List has a numeric index. If you use <list>, this is what you get. If you use <bag> (see the documentation for what a Bag is), you can use sort and order attributes and let the database sort your collection.

It looked to me that the index column is used for sorting when calling the database for the items that should be included in the list.

Are you impliying that a Lists can not be baes on sorted query results or that the value of a index field for the returned List is also used as the index of a particular entry in the List?

I may not be a seasoned Java programmer but retrieving such a List did not seem like such a bad idea.

Anyway, I'm on the right track now.

Thank you,
-Stefan

Think ArrayList where the index is the position of the item in the Array. If there are gaps in the index sequence then a null will be the resulting object at that position.