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, because it seems that the persistence unit is unknown. Try repeating the tutorial steps one by one carefully or download ... the  unit name to the DAO class: (if I remove it then the exception thrown is the same with null for the Unit Name)   Thanks, Allen   ceylonsoft Allen T. Arumainayagam Maybe

Jakarta Persistence (JPA) Method in jakarta. persistence .PersistenceUnitUtil boolean isLoaded (    Object entity ) Determine the load state of an entity belonging to the persistence unit ... whose load state is to be determined Returns: false if the entity has not been loaded, else true. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta. persistence .EntityManagerFactory PersistenceUnitTransactionType getTransactionType() The type of transaction management used by this persistence unit , either resource-local transaction management, or JTA. Since: Jakarta Persistence (JPA) 3.2

Jakarta Persistence (JPA) Method in jakarta. persistence .EntityManagerFactory SchemaManager getSchemaManager() Return interface providing access to schema management operations for the persistence unit . Returns: an instance of SchemaManager . Throws: IllegalStateException - if the entity manager

the managed types belonging to the persistence unit . Returns: an instance of Metamodel . Throws: IllegalStateException - if the entity manager has been closed. Since: Jakarta Persistence (JPA) 2.0 ... Jakarta Persistence (JPA) Method in jakarta. persistence .EntityManager Metamodel getMetamodel

Jakarta Persistence (JPA) Method in jakarta. persistence .EntityManagerFactory String getName() The name of the persistence unit . Since: Jakarta Persistence (JPA) 3.2

Jakarta Persistence (JPA) Method in jakarta. persistence .EntityManagerFactory PersistenceUnitUtil getPersistenceUnitUtil() Return interface providing access to utility methods for the persistence unit . Returns: an instance of PersistenceUnitUtil . Throws: IllegalStateException - if the entity

Jakarta Persistence (JPA) Method in jakarta. persistence .EntityManagerFactory Metamodel getMetamodel() Return an instance of the Metamodel interface for access to the metamodel of the persistence unit . Returns: an instance of Metamodel . Throws: IllegalStateException - if the entity manager factory has been closed. Since: Jakarta Persistence (JPA) 2.0

Jakarta Persistence (JPA) Enum Constant in jakarta. persistence .SharedCacheMode NONE Caching is disabled for the persistence unit . Since: Jakarta Persistence (JPA) 1.0

names must be unique within the persistence unit . Default: "" Since: Jakarta Persistence (JPA) 1.0 ... Jakarta Persistence (JPA) Method in jakarta. persistence .NamedEntityGraph String name (Optional) The name used to identify the entity graph in calls to EntityManager.getEntityGraph . If no name

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.CriteriaBuilder Used to construct ... compatible with varags. Since: Jakarta Persistence (JPA) 2.0 The JPA Criteria API Queries article ... : absolute value. Since: Jakarta Persistence (JPA) 1.0 Expression all ( Subquery subquery ) Create

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.MapJoin Type Parameters ... collection that has been specified as a Map . Since: Jakarta Persistence (JPA) 2.0 Public Instance ... Parameters: name - alias Returns: selection item. Since: Jakarta Persistence (JPA) 1.0 Expression as

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.ListJoin Type Parameters ... that has been specified as a List . Since: Jakarta Persistence (JPA) 2.0 Public Instance Methods Selection alias ... : selection item. Since: Jakarta Persistence (JPA) 1.0 Expression as ( Class type ) Perform

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.PluralJoin Type Parameters ... query construction. Since: Jakarta Persistence (JPA) 2.0 Public Instance Methods Selection alias ... Returns: selection item. Since: Jakarta Persistence (JPA) 1.0 Expression as ( Class type ) Perform

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.SetJoin Type Parameters ... that has been specified as a Set . Since: Jakarta Persistence (JPA) 2.0 Public Instance Methods Selection alias ( String ... : selection item. Since: Jakarta Persistence (JPA) 1.0 Expression as ( Class type ) Perform a typecast

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.CollectionJoin Type Parameters ... that has been specified as a Collection . Since: Jakarta Persistence (JPA) 2.0 Public Instance ... Parameters: name - alias Returns: selection item. Since: Jakarta Persistence (JPA) 1.0 Expression as ( Class

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.Join Type Parameters ... Persistence (JPA) 2.0 The FROM clause (JPQL / Criteria API) article explains how to use Join . Public ... Selection Parameters: name - alias Returns: selection item. Since: Jakarta Persistence (JPA) 1.0 Expression

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.Root Type Parameters ... Persistence (JPA) 2.0 The FROM clause (JPQL / Criteria API) article explains how to use Root ... Selection Parameters: name - alias Returns: selection item. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.From Type Parameters ... to the type. Since: Jakarta Persistence (JPA) 2.0 Public Instance Methods Selection alias ( String name ... . Since: Jakarta Persistence (JPA) 1.0 Expression as ( Class type ) Perform a typecast

Jakarta Persistence (JPA) Interface jakarta. persistence .TypedQuery Type Parameters: - query result ... . See Also: Query Parameter Since: Jakarta Persistence (JPA) 2.0 Chapter 4 - JPA Queries (JPQL / Criteria ... : IllegalStateException - if called for a Jakarta Persistence query language SELECT statement or for a criteria

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Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.Subquery Type Parameters ... . A subquery has an expression as its selection item. Since: Jakarta Persistence (JPA) 2.0 Public ... Parameters: name - alias Returns: selection item. Since: Jakarta Persistence (JPA) 1.0 Expression

Jakarta Persistence (JPA) Interface jakarta. persistence .metamodel.EntityType Type Parameters ... An instance of EntityType represents an entity type. Since: Jakarta Persistence (JPA) 2.0 Public Instance ... of the given name is not present in the managed type. Since: Jakarta Persistence (JPA) 1.0 Set

Jakarta Persistence (JPA) Interface jakarta. persistence .metamodel.IdentifiableType Type Parameters ... Persistence (JPA) 2.0 Public Instance Methods Attribute getAttribute ( String name ) Return the attribute ... Persistence (JPA) 1.0 Set getAttributes () Return the attributes of the managed type. Inherited from

Jakarta Persistence (JPA) Interface jakarta. persistence .metamodel.MappedSuperclassType Type ... Persistence (JPA) 2.0 Public Instance Methods Attribute getAttribute ( String name ) Return ... . Since: Jakarta Persistence (JPA) 1.0 Set getAttributes () Return the attributes of the managed type. Inherited

Jakarta Persistence (JPA) Field in jakarta. persistence . Persistence PERSISTENCE _PROVIDER This final ... Deprecated: TODO: Either change TCK reference to PERSISTENCE _PROVIDER field to expect "jakarta. persistence .spi.PersistenceProvider" or remove PERSISTENCE _PROVIDER field and also update TCK signature tests. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Constructor in jakarta. persistence . Persistence Persistence () Default constructor. Deprecated: This class is not intended to be extended nor instantiated, it is going to be marked final when this constructor becomes hidden. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Interface jakarta. persistence .metamodel.ManagedType Type Parameters ... , mapped superclass, and embeddable types. Since: Jakarta Persistence (JPA) 2.0 Public Instance Methods ... the managed type. Since: Jakarta Persistence (JPA) 1.0 Set getAttributes () Return the attributes

Jakarta Persistence (JPA) Interface jakarta. persistence .metamodel.EmbeddableType Type Parameters ... of EmbeddableType represents an embeddable type. Since: Jakarta Persistence (JPA) 2.0 Public Instance Methods ... is not present in the managed type. Since: Jakarta Persistence (JPA) 1.0 Set getAttributes () Return

Jakarta Persistence (JPA) Interface jakarta. persistence .EntityGraph Type Parameters: - The type ... Persistence (JPA) 2.1 Public Instance Methods AttributeNode addAttributeNode ( String attributeName ... .. Since: Jakarta Persistence (JPA) 3.2 AttributeNode addAttributeNode ( Attribute attribute ) Get an existing

Jakarta Persistence (JPA) Interface jakarta. persistence .Graph Declares operations common to EntityGraph and Subgraph . See Also: EntityGraph Subgraph Since: Jakarta Persistence (JPA) 3.2 Public ... is not an attribute of this entity.. Since: Jakarta Persistence (JPA) 3.2 AttributeNode

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.CriteriaQuery Type Parameters ... . Since: Jakarta Persistence (JPA) 2.0 The JPA Criteria API Queries article explains how to use ... .. Since: Jakarta Persistence (JPA) 1.0 Root from ( Class entityClass ) Create and add a query root

Jakarta Persistence (JPA) Interface in jakarta. persistence .criteria.CriteriaBuilder jakarta. persistence .criteria.CriteriaBuilder.In Super Interfaces: Predicate , Expression , Selection , TupleElement Interface used to build in predicates. Since: Jakarta Persistence (JPA) 1.0 Public Instance

Jakarta Persistence (JPA) Interface in jakarta. persistence .criteria.CriteriaBuilder jakarta. persistence .criteria.CriteriaBuilder.SimpleCase Super Interfaces: Expression , Selection , TupleElement ... which they are specified. Since: Jakarta Persistence (JPA) 1.0 Public Instance Methods Selection alias

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.Path Type Parameters: - the type ... . Since: Jakarta Persistence (JPA) 2.0 The Paths and Types in JPQL and Criteria API article explains ... . Inherited from Selection Parameters: name - alias Returns: selection item. Since: Jakarta Persistence

Jakarta Persistence (JPA) Interface in jakarta. persistence .criteria.CriteriaBuilder jakarta. persistence .criteria.CriteriaBuilder.Case Super Interfaces: Expression , Selection , TupleElement ... which they are specified. Since: Jakarta Persistence (JPA) 1.0 Public Instance Methods Selection alias ( String

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.Predicate Super Interfaces ... . Since: Jakarta Persistence (JPA) 2.0 The Logical Operators in JPQL and Criteria API article explains ... Persistence (JPA) 1.0 Expression as ( Class type ) Perform a typecast upon the expression, returning

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.ParameterExpression Type ... , TupleElement Type of criteria query parameter expressions. Since: Jakarta Persistence (JPA) 2.0 Public ... Selection Parameters: name - alias Returns: selection item. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.AbstractQuery Type Parameters ... own joins). All queries may have: a conjunction of restrictions. Since: Jakarta Persistence (JPA) 2.0 ... Persistence (JPA) 1.0 Root from ( Class entityClass ) Create and add a query root corresponding

Jakarta Persistence (JPA) Interface in jakarta. persistence .criteria.CriteriaBuilder jakarta. persistence .criteria.CriteriaBuilder.Coalesce Super Interfaces: Expression , Selection , TupleElement ... otherwise. Since: Jakarta Persistence (JPA) 1.0 Public Instance Methods Selection alias ( String

Jakarta Persistence (JPA) Interface jakarta. persistence .metamodel.SingularAttribute Type ... Interfaces: Attribute , Bindable Instances of the type SingularAttribute represents persistent single-valued properties or fields. Since: Jakarta Persistence (JPA) 2.0 Public Instance Methods Class

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.Expression Type Parameters ... . Since: Jakarta Persistence (JPA) 2.0 The JPA Query Expressions (JPQL / Criteria) article explains ... Persistence (JPA) 1.0 Expression as ( Class type ) Perform a typecast upon the expression, returning a new

Jakarta Persistence (JPA) Annotation Type jakarta. persistence .Column Implemented Interfaces: Annotation Target: Method, Field Specifies the column mapped by the annotated persistent property or ... of type numeric or decimal . Since: Jakarta Persistence (JPA) 1.0 Annotation Elements String name

Jakarta Persistence (JPA) Interface jakarta. persistence .metamodel.MapAttribute Type Parameters ... of the type MapAttribute represent persistent Map -valued attributes. Since: Jakarta Persistence (JPA ... or attribute is returned. Inherited from Bindable Returns: Java type. Since: Jakarta Persistence (JPA

Jakarta Persistence (JPA) Annotation Type jakarta. persistence .JoinTable Implemented Interfaces ... ", referencedColumnName = "ID")) This annotation may not be applied to a persistent field or property not annotated ... Persistence (JPA) 1.0 Annotation Elements String name (Optional) The name of the join table. Defaults

Jakarta Persistence (JPA) Annotation Type jakarta. persistence .JoinColumn Implemented Interfaces ... CollectionTable ForeignKey Since: Jakarta Persistence (JPA) 1.0 Annotation Elements String name (Optional ... Persistence (JPA) 1.0 String referencedColumnName (Optional) The name of the column referenced by

Jakarta Persistence (JPA) Interface jakarta. persistence .criteria.CriteriaUpdate Type Parameters ... . The persistence context is not automatically synchronized with the result of the bulk update. A CriteriaUpdate object must have a single root. Since: Jakarta Persistence (JPA) 2.1 Public Instance

Jakarta Persistence (JPA) Interface jakarta. persistence .metamodel.ListAttribute Type Parameters ... Interfaces: PluralAttribute , Attribute , Bindable Instances of the type ListAttribute represent persistent List -valued attributes. Since: Jakarta Persistence (JPA) 2.0 Public Instance Methods Class

Jakarta Persistence (JPA) Interface jakarta. persistence .metamodel.CollectionAttribute Type ... CollectionAttribute represent persistent Collection -valued attributes. Since: Jakarta Persistence (JPA) 2.0 Public ... is returned. Inherited from Bindable Returns: Java type. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Interface jakarta. persistence .metamodel.SetAttribute Type Parameters ... : PluralAttribute , Attribute , Bindable Instances of the type SetAttribute represent persistent Set -valued attributes. Since: Jakarta Persistence (JPA) 2.0 Public Instance Methods Class