About constructor

manual

JPA Persistable Types

Explains how JPA manages types, including entity classes, embeddable classes, primitive types, wrappers, string, date, enum, collections and maps.... should have a public or protected no-arg constructor. cannot be final and cannot have final ... In most cases ObjectDB can overcome a missing no-arg constructor. Aside from these constraints an entity class is like ...

 
issue

com.objectdb.o.InternalException: java.lang.ArrayIndexOutOfBoundsException: null:

The following error appears under and extended persistence context, and with creation, configuration and wiring code that is known to work perfectly with EclipseLink+Glassfish: SEVERE: Unexpected internal exception ... ) { try { Constructor constructor = clazz. getConstructor ( Element . class , ...

 
api-jdo

javax.jdo.Query

The Query interface allows applications to obtain persistent instances, values, and aggregate data from the data store.(Interface of JDO)

 
api-jdo

javax.jdo.JDONullIdentityException

An instance of this class is thrown when attempting to create an object id when the object id constructor parameter is null.(Exception of JDO)

 
release

2.2.9

Release date: 2011-08-10 Download (5.15 MB) Binary:  objectdb-2.2.9.zip You should start by following a  tutorial or reading the manual ...

 
manual

Retrieving JPA Entity Objects

Explains how to use JPA to retrieve entity objects from the database.... of a new managed object during retrieval uses the no-arg constructor. Therefore, it is recommended to avoid unnecessary time consuming ...

 
release

2.3.0

Release date: 2011-09-21 Download (5.32 MB) Binary:  objectdb-2.3.0.zip You should start by following a  tutorial or reading the manual ...

 
api-jdo

javax.jdo.identity.SingleFieldIdentity

This class is the abstract base class for all single field identity classes.(Class of JDO)

 
forum_thread

Visibility of changes in Transaction is not visible to a JPA QL Query

I have two simple Entities ( see attachment ) and a simple SLSB with container managed transactions which is called by a trivial servlet. Inside a UserTransaction I add a number of items then check to see that they have been added ... Integer property ;     // Bonus empty constructor generated for JPA protected Item ( ) { ... emInj ;   /** * Default constructor. */ public SLSBObjDb ( ) { ...

 
forum_thread

Multi-thread access to single EM's entities

If my entity classes have synchronized getters and setters, is it reliable for multiple threads to access a single EM's managed entities, as long as only the thread that created the EM interacts directly with it?  I've tested this and it seems to work... but I know better than to depend on the observable behavior of multithreaded code. When I run this example and examine the database, the entity contains the value set by the second thread, as expected.   ... replace every access of a persistent field (outside the constructor) with invocation of a method that ObjectDB adds to the classes ...