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

When using java 8, you may take advantage of stream API and simplify code to

return (YourEntityClass) entityManager.createQuery()
....
.getResultList()
.stream().findFirst();

That will give you java.util.Optional

If you prefer null instead, all you need is

 ...
.getResultList()
.stream().findFirst().orElse(null);