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A JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes, embeddable classes and mapped superclasses) with related settings. Defining a persistence unit is optional when using ObjectDB, but required by JPA. persistence .xml Persistence units are defined in

with a default persistence unit (that will be configured later). If the  Finish button is disabled ... JPA persistence unit (with default settings) was generated in a persistence .xml file that was added ... ) and selecting New Entity Class ... (or New Other... Persistence Entity Class and clicking Next ). Enter

file with a default persistence unit (that will be configured later). If the Finish button is disabled ... JPA persistence unit (with default settings) was generated in a persistence .xml file that was added ... ) and selecting  New Entity Class ... (or  New Other... Persistence Entity Class and clicking

.Serializable; import java.sql.Date; import javax. persistence .Entity; import javax. persistence .GeneratedValue; import javax. persistence .Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id; private

java.io.Serializable; import java.sql.Date; import javax. persistence .Entity; import javax. persistence .GeneratedValue; import javax. persistence .Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id

How do I fix this error/warning that Netbeans gives me regarding no persistence unit ?   ThreaT Ashton Hogan ObjectDB itself does not require a persistence unit , but NetBeans produces this warning because a persistence unit is required by JPA. Although your application should work

, 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

of the createEntityManagerFactory method takes a map of persistence unit properties as a second parameter: Map properties ... an argument a name of a persistence unit . As an extension, ObjectDB enables specifying a database URL (or path) directly, bypassing the need for a persistence unit . Any string that starts with objectdb

in the ObjectDB configuration. Per persistence unit in the persistence .xml  file. Per entity ... the cache a positive value has to be specified. Persistence Unit Settings The shared cache can also be enabled or disabled using a persistence unit property:        

to get an EntityManager instance. JPA requires the definition of a persistence unit in an XML file in order ... persistence unit in an XML file or you can simply provide the file path of the ObjectDB database ... :$objectdb/db/points.odb"); The createEntityManagerFactory static method expects a persistence unit name as

; path to input user classes -pu :  persistence unit name -s :  include sub directories in ... with the name of a persistence unit to enhance all the managed classes that are defined in that persistence unit : java com.objectdb.Enhancer -pu my-pu The -cp option can be used to specify

The term persistable types refers to data types that can be used for storing data in the database. ObjectDB supports all the JPA persistable types, which are: User defined classes - Entity classes ... can be stored in the database directly. Other persistable types can be embedded in entity classes as fields

. But since the scope of named queries is the entire persistence unit , names should be selected ... that JPA requires the listing of managed classes in a persistence unit definition is to support named ... classes must be available. ObjectDB makes the definition of a persistence unit optional. Named queries

", "We", "Us" or "Our" in this Agreement) refers to ObjectDB Software Ltd, 109 Vernon House Friar Lane Unit 632 37 Westminster Buildings Theatre Square Nottingham NG1 6LG United Kingdom. Cookies  are small ... section and verifying system and server integrity). Cookies can be " Persistent " or "Session" Cookies

The Java Persistence API (JPA) is a standard API for accessing databases from within Java ... JDBC. Using plain old Java objects (POJO) to represent persistent data can significantly simplify ... of the Java Persistence API (JPA). By interacting with ObjectDB using standard JPA

, or in another location that is specified explicitly in the persistence unit definition (in ... New entity objects can be stored in the database either explicitly by invoking the persist method or implicitly as a result of a cascade operation. Explicit Persist The following code stores

the persistence unit (which is optional when using ObjectDB) then only known managed types are returned ... the persistence unit and have not been used yet). In this case, calling the method introduces ... The JPA Metamodel API provides the ability to examine the persistent object model and retrieve

( no persistence unit ). Keep the test as simple as possible - remove unnecessary code (but keep it complete ... a persistence unit , An entity or IdClass class should implement the java.io.Serializable interface). ... test; import java.util.*; import javax. persistence .*; public final class MyTestCase {   

persistence solution for Java, based on the Java Persistence API (JPA) and the Java Data Objects (JDO ... Software Ltd Unit 632 37 Westminster Buildings Theatre Square Nottingham NG1 6LG United Kingdom +44 (0

): For the entire persistence unit - using a persistence .xml  property:      ... supports the following query hints: "javax. persistence .query.timeout" - sets maximum query execution time ... . persistence .lock.timeout" - sets maximum waiting time for pessimistic locks, when pessimistic locking

;The hint can be set in several scopes: For the entire persistence unit - using a persistence .xml   ... occurs a LockTimeoutException is thrown immediately. The "javax. persistence .lock.timeout"  hint ... ; properties.put("javax. persistence .lock.timeout", 2000);   EntityManagerFactory emf =  

that is specified explicitly in the persistence unit definition (in persistence .xml ). Default ... is invoked: @PrePersist - before a new entity is persisted (added to the EntityManager

navigation to persistent string fields. as results of predefined JPQL string manipulation functions ... returns the number of characters in the argument string as an int . For example: LENGTH(' United

) Create and return an EntityManagerFactory for the named persistence unit . Parameters: persistenceUnitName the - name of the persistence unit Return: the factory that creates EntityManagers configured according to the specified persistence unit Since: JPA 1.0 EntityManagerFactory

is defined by a persistence unit . A persistence unit defines the set of all classes that are related or ... of the persistence unit . Return: Metamodel instance Throws: IllegalStateException - if the entity manager ... JPA Interface EntityManager Interface used to interact with the persistence context

the application and the persistence provider managing the persistence unit . The methods ... for this persistence unit or on new entity instances. Since: JPA 2.0 Public Methods Object getIdentifier ... the load state of an entity belonging to the persistence unit . This method can be used to determine

and return an EntityManagerFactory for the named persistence unit using the given properties. Parameters: persistenceUnitName the - name of the persistence unit properties Additional - properties to use ... : the factory that creates EntityManagers configured according to the specified persistence unit . Since: JPA 1.0

for the named persistence unit . Parameters: persistenceUnitName the - name of the persistence unit Return: the factory that creates EntityManagers configured according to the specified persistence unit Since: JPA 1.0 ... JPA Static Method in javax. persistence . Persistence EntityManagerFactory createEntityManagerFactory

Expresses a dependency on an EntityManagerFactory and its associated persistence unit . Since: JPA 1.0 ... is used. Since: JPA 1.0 String unitName default "" (Optional) The name of the persistence unit as defined in the persistence .xml file. If specified, the persistence unit for the entity manager

for the persistence unit . When the application has finished using the entity manager factory, and/or ... () Return an instance of Metamodel interface for access to the metamodel of the persistence unit . Return ... methods for the persistence unit . Return: PersistenceUnitUtil interface Throws

of the persistence unit as defined in the persistence .xml file. If the unitName element is specified, the persistence unit for the entity manager that is accessible in JNDI must have the same name. Since: JPA 1.0 ... Expresses a dependency on a container-managed EntityManager and its associated persistence context

JPA Annotation Attribute in javax. persistence .PersistenceUnit String unitName default "" (Optional) The name of the persistence unit as defined in the persistence .xml file. If specified, the persistence unit for the entity manager factory that is accessible in JNDI must have the same name. Since: JPA 1.0

JPA Enum SharedCacheMode java.lang.Object ∟  java.lang.Enum ∟  javax. persistence .SharedCacheMode Specifies how the provider must use a second-level cache for the persistence unit ... . All other entities are not cached. Since: JPA 2.0 NONE Caching is disabled for the persistence unit . Since: JPA 2.0

JPA Annotation Attribute in javax. persistence .PersistenceContext String unitName default "" (Optional) The name of the persistence unit as defined in the persistence .xml file. If the unitName element is specified, the persistence unit for the entity manager that is accessible in JNDI must have the same name. Since: JPA 1.0

, named query in the Java Persistence query language. Query names are scoped to the persistence unit ... of the definition of a named query in the Java Persistence query language: @NamedQuery( name ... must be executed in a transaction and the persistence context joined to the transaction. Since: JPA 2.0

JPA Enum ValidationMode java.lang.Object ∟  java.lang.Enum ∟  javax. persistence .ValidationMode The validation mode to be used by the provider for the persistence unit . Since: JPA 2.0 Enum Constants AUTO If a Bean Validation provider is present in the environment, the persistence provider

- the name of the persistence unit map - properties for schema generation; these may also contain ... JPA Static Method in javax. persistence . Persistence void generateSchema (   String persistenceUnitName,    Map map ) Create database schemas and/or tables and/or

JPA Interface Metamodel Provides access to the metamodel of persistent entities in the persistence unit . Since: JPA 2.0 Public Methods EmbeddableType embeddable (Class  cls) Return the metamodel embeddable type representing the embeddable class. Parameters: cls - the type of the represented

JPA Annotation NamedQueries Target: TYPE Implemented Interfaces: Annotation Specifies multiple named Java Persistence query language queries. Query names are scoped to the persistence unit . The NamedQueries annotation can be applied to an entity or mapped superclass. See Also: NamedQuery

on the primary key field or property. The scope of the generator name is global to the persistence unit ... . Defaults to a name chosen by persistence provider. Since: JPA 1.0 UniqueConstraint

JPA Enum Constant in javax. persistence .SharedCacheMode NONE Caching is disabled for the persistence unit . Since: JPA 2.0

. If the autoApply element is specified as true , the persistence provider must automatically apply the converter to all mapped attributes of the specified target type for all entities in the persistence unit

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an executable StoredProcedureQuery object. Names are scoped to the persistence unit . The procedureName element

JPA Annotation NamedStoredProcedureQueries Target: TYPE Implemented Interfaces: Annotation Specifies multiple named stored procedure queries. Query names are scoped to the persistence unit . The NamedStoredProcedureQueries annotation can be applied to an entity or mapped superclass

class. The warning that NetBeans displays on the Guest class indicates that a persistence unit ... code: package guest; import java.io.Serializable; import java.sql.Date; import javax. persistence .Entity; import javax. persistence .GeneratedValue; import javax. persistence .Id; @Entity public class Guest

Persistent Classes are user defined classes whose instances can be stored in a database using JDO. Instances of these classes that represent objects in the database are called persistent objects or persistent instances . Objects that do not represent anything in the database (including instances

Objects Persistent In JDO applications, every object in memory is either a persistent object, i.e ... object, regardless of its type. Instances of persistent classes can become persistent later, as ... transient object. Then it becomes persistent by an explicit call to the makePersistent( ... ) method

indicates that a persistence unit definition in an XML file is missing. This is discussed in the ObjectDB ... .Serializable; import javax. persistence .*; @Entity public class Point implements Serializable { private

more persistent classes. All the persistent classes, and only them, have to be declared in a metadata ... at runtime, ObjectDB determines whether or not each class is persistent . It searches for JDO metadata ... is found, the class is persistent , and if not, the class is transient. Metadata for class a.b.X ( a.b