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How would Exception handling work for this snippet of Spring?

 
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If there are 15 items in this List and 5 of them already exist in the db so only 10 are going to be stored into db, while I've used @ControllerAdvice so all the Exceptions go there, but after this operation how to track which 5 items weren't saved successfully and how to let user know about those 5 items?

Will the iteration keep going until the last element of the List despite Exceptions occur 5 times?

Thanks.
 
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Assuming saveItem method raises an exception if the item already exists in DB, you can surround this call with try.. catch, and collect the items in a list for which this call raised an exception, and then return this list from saveItem method.
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