javax.persistence.NoResultException: No entity found for query

Question

Before I posted this question, I already looked this, but I couldn\'t get what I was looking for.

I know that for the query I wrote there may exist only one row or n

Answer 1

Yes. You need to use the try/catch block, but no need to catch the Exception. As per the API it will throw NoResultException if there is no result, and its up to you how you want to handle it.

DrawUnusedBalance drawUnusedBalance = null;
try{
drawUnusedBalance = (DrawUnusedBalance)query.getSingleResult()
catch (NoResultException nre){
//Ignore this because as per your logic this is ok!
}

if(drawUnusedBalance == null){
 //Do your logic..
}