How storage works?

I have one Class Car that contains a ArrayList of Wheels. I have already one Car with 4 Wheels attached stored in the DB. If I update my Car adding a new Wheel object is all the Car updated? Or only changed part is updated? By other words, If I have one complex data model and only one part is changed, the Object DB stored the all complex data model or only the changed part? Thanks ... the Car updated? Or only changed part is updated? By other words, If I have one complex data model and only one part is changed, ... object model - only modified entity objects are stored by ObjectDB again. When an element is added to a collection - only the ...



The Throwable class is the superclass of all errors and exceptions in the Java language.(Class of java.langClass Throwable)



The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.(Exception of java.langException Exception)


Database Management Settings

Explains settings and performance tuning of the ObjectDB Java object database for JPA/JDO.... The resize attribute specifies the size by which to extend the database file when additional space is needed. Small ... values save space. Larger values can improve performance by reducing file fragmentation (many resize operations might cause ...



This class represents exceptions caused by the use of optional features not supported by the JDO implementation.(Exception of JDO)


UserException: Invalid configuration in 'internal' - Check permissions

Hi all,   I have a master/slave code so that each slave reads a subset of points of the same database. ObjectDB entities do not allow serialization and so I have sent, to each slave, the file path. With such information I have tried to create an entityManager, in each slave, as follows: EntityManagerFatory entityManagerFactory = Persistence.createEntityManagerFactory(filePath); EntityManager = entityManagerFactory.createEntityManager(); However I get the following error ... ( Thread. java :745 ) Caused by: java .lang.ExceptionInInitializerError at com.objectdb.o.RCL. ... java :145 ) ... 7 more Caused by: com.objectdb.o.UserException: Invalid configuration in 'internal' - Check ... ( CFG. java :60 ) ... 18 more Caused by: java .lang.ExceptionInInitializerError at com.objectdb.o.LGM. ...



Thrown by the persistence provider when EntityManager.persist(Object) is called and the entity already exists.(Exception of JPA)



Specifies a column for joining an entity association or element collection.(Annotation of JPA)



Thrown by the persistence provider when an optimistic locking conflict occurs.(Exception of JPA)



... Fixed a bug in displaying inverse (mapped by) relations in the Explorer. Fixed a bug in reusing database ... include META-INF/MANIFEST.MF as the first entry (required by Apache Karaf ). Fixed a cache bug in repeating ...