JPA Method
in javax.persistence.Query

Object getSingleResult()

Execute a SELECT query that returns a single untyped result.
Return:
the result
Throws:
NoResultException - if there is no result
NonUniqueResultException - if more than one result
IllegalStateException - if called for a Java 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 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
Since:
JPA 1.0