X getSingleResultOrNull()
Execute a SELECT query that returns a single untyped result.
- Return:
- the result, of type {@link X} , or null if there is no result
- Throws:
- NonUniqueResultException - if more than one result
- IllegalStateException - if called for a Jakarta Persistence query language UPDATE or DELETE statement
- QueryTimeoutException - if the query execution exceeds the query timeout value set and only the statement is rolled back
- TransactionRequiredException - if a lock mode other than {@code NONE} has been set and there is no transaction or the persistence context has not been joined to the transaction
- PessimisticLockException - if pessimistic locking fails and the transaction is rolled back
- LockTimeoutException - if pessimistic locking fails and only the statement is rolled back
- PersistenceException - if the query execution exceeds the query timeout value set and the transaction is rolled back
- IllegalStateException - if called for a Jakarta Persistence query language UPDATE or DELETE statement
- Since:
- JPA 3.2