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(Optional) Specifies whether the value of the field or property may be null . This is a hint ... is not null . If not specified, defaults to true . Default: true Since: Jakarta Persistence (JPA) 1.0

TransactionRequiredException exception with null as its detail message. Since: Jakarta Persistence (JPA ... exception with null as its detail message. Since: Jakarta Persistence (JPA) 1.0

() Constructs a new NonUniqueResultException exception with null as its detail message. Since: Jakarta ... NonUniqueResultException exception with null as its detail message. Since: Jakarta Persistence (JPA) 1.0

Methods String getName () Return the parameter name, or null if the parameter is not a named ... position, or null if the parameter is not a positional parameter. Returns: position of parameter. Since: Jakarta Persistence (JPA) 1.0

datasource, if any, or null . Since: Jakarta Persistence (JPA) 1.0 PersistenceConfiguration managedClass ... of a non-JTA javax.sql.DataSource . Returns: the configured non-JTA datasource, if any, or null

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.Order Nulls getNullPrecedence() Return the precedence of null values. Returns: the precedence of null values . Since: Jakarta Persistence (JPA) 3.2

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Expression nullLiteral (    Class resultClass ) Create an expression for a null literal with the given type. Parameters: resultClass - type of the null literal Returns: null expression literal. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Expression coalesce (    Expression x ,    Expression y ) Create an expression that returns null if all its arguments evaluate to null , and the value of the first non- null argument

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Expression coalesce (    Expression x ,    Y y ) Create an expression that returns null if all its arguments evaluate to null , and the value of the first non- null argument otherwise. Parameters: x

Jakarta Persistence (JPA) Method in jakarta.persistence.metamodel.SingularAttribute boolean isOptional() Can the attribute be null ? Returns: boolean indicating whether the attribute can be null . See Also: jakarta.persistence.Basic::optional Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.Join Attribute getAttribute() Return the metamodel attribute representing the join target, if any, or null if the target of the join is an entity type. Returns: metamodel attribute or null . Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.ManyToOne boolean optional (Optional) Whether the association is optional. If set to false then a non- null relationship must always exist. May be used in schema generation to infer that the mapped foreign key column is not null . Default: true Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Predicate isNull (    Expression x ) Create a predicate to test whether the expression is null . Parameters: x - expression Returns: is- null predicate. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Predicate isNotNull (    Expression x ) Create a predicate to test whether the expression is not null . Parameters: x - expression Returns: is-not- null predicate. Since: Jakarta Persistence (JPA) 1.0

: the found entity instance or null if the entity does not exist. Throws: IllegalArgumentException ... for that entity's primary key or is null . Since: Jakarta Persistence (JPA) 1.0

: the found entity instance or null if the entity does not exist. Throws: PessimisticLockException ... unit, or if the second argument is not a valid non- null instance of the entity primary key type

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.Expression Predicate isNull() Create a predicate to test whether the expression is null . Returns: predicate testing whether the expression is null . Since: Jakarta Persistence (JPA) 1.0

: the found entity instance or null if the entity does not exist. Throws: IllegalArgumentException ... for that entity's primary key or is null . Since: Jakarta Persistence (JPA) 2.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.Expression Predicate isNotNull() Create a predicate to test whether the expression is not null . Returns: predicate testing whether the expression is not null . Since: Jakarta Persistence (JPA) 1.0

class lockMode - lock mode primaryKey - primary key Returns: the found entity instance or null ... the second argument is not a valid type for that entity's primary key or is null

Returns: the found entity instance or null if the entity does not exist. Throws ... for that entity's primary key or is null . PersistenceException - if an unsupported lock

: the found entity instance or null if the entity does not exist. Throws: PessimisticLockException ... unit, or if the second argument is not a valid non- null instance of the entity primary key type

Jakarta Persistence (JPA) Method in jakarta.persistence.Basic boolean optional (Optional) Specifies whether the value of the field or property may be null . This is a hint and is disregarded for primitive types; it may be used in schema generation to infer that the mapped column is not null

PessimisticLockException () Constructs a new PessimisticLockException exception with null as its detail message

= "EMP_PIC", columnDefinition = "BLOB NOT NULL ") protected byte[] pic; See Also: Basic

exception with null as its detail message. Since: Jakarta Persistence (JPA) 1.0 LockTimeoutException

factory (the "second level cache"). Returns: an instance of Cache , or null if there is no second

, in seconds. This is a hint. Parameters: timeout - the timeout, in seconds, or null to indicate

). Returns null if the EntityGraph is not a named EntityGraph . Since: Jakarta Persistence (JPA) 1.0

EntityExistsException () Constructs a new EntityExistsException exception with null as its detail message

. The annotated field must not be null , and must hold a distinct value for each value of the enum type

null , if no alias has been assigned. Inherited from TupleElement Returns: alias. Since: Jakarta

the entity or mapped superclass. Returns: supertype of identifiable type or null if no such supertype

. Inherited from IdentifiableType Returns: supertype of identifiable type or null if no such supertype

from IdentifiableType Returns: supertype of identifiable type or null if no such supertype

() Return the alias assigned to the tuple element or null , if no alias has been assigned. Returns: alias

. Since: Jakarta Persistence (JPA) 1.0 String getAlias () Return the alias assigned to the tuple element or null

the predicate that corresponds to the where clause restriction(s), or null if no restrictions

the predicate that corresponds to the where clause restriction(s), or null if no restrictions

to the where clause restriction(s), or null if no restrictions have been specified. Inherited from

; } Example 2: @Column(name = "DESC", columnDefinition = "CLOB NOT NULL ", table = "EMP_DETAIL") @Lob

with null as its detail message. Since: Jakarta Persistence (JPA) 1.0 QueryTimeoutException ( String

RollbackException exception with null as its detail message. Since: Jakarta Persistence (JPA) 1.0

exception with null as its detail message. Since: Jakarta Persistence (JPA) 1.0 NoResultException

) Whether the association is optional. If set to false then a non- null relationship must always exist

Constructors OptimisticLockException () Constructs a new OptimisticLockException exception with null as

PersistenceException exception with null as its detail message. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Expression nullif (    Expression x ,    Y y ) Create an expression that tests whether its argument are equal, returning null if they are and the value of the first expression if they are not

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.AbstractQuery Predicate getGroupRestriction() Return the predicate that corresponds to the restriction(s) over the grouping items, or null if no restrictions have been specified. Returns: having clause predicate. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.AbstractQuery Selection getSelection() Return the selection of the query, or null if no selection has been set. Returns: selection item. Since: Jakarta Persistence (JPA) 1.0