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55

Database corrupted after schema change

HashMap<String, Object> attributes; } public abstract class BDO implements BDOInterface ... interface DCG extends C { ... } After this change the app starts, it only reads the objects ... that the values of the fields are shifted, so in one database TC.tableID contains the value of BDO
55

Object Relations Error after Schema Change

everything works well for awhile, until a user that still has the old version of the class accesses the database ... ) to migrate data from one ObjectDB database to another ObjectDB database, we think starting with a new ... advance. Regards. peric.emil Emil Perić Could you please check the database with the ObjectDB Doctor
55

Executing JUnit "all tests" throws "Object ... belongs to another EntityManager" Exception

Good day! I wrote some JUnit tests that create separate objectdb databases and exercise ... ," one fails consistently with the message: com.objectdb.o._JdoUserException: Object 'actr.model.Symbol ... more than one PersistenceManager, and somehow objects from different PersistenceManager instances get mixed, which is forbidden
55

Attempt to refresh a non managed entity object (error 635)

.IllegalArgumentException Attempt to refresh a non managed entity object (error 635) Nothing changed in my code ... with Intellij's JPA database explorer, which required me to use a JPA persistence.xml configuration file ... ) on a non managed entity object, i.e. a new entity object that has not been persisted yet, or
55

how to persist an object twice into two diff. collections of two diff. classes

ok my problem, i persist a Squad Object into a Cup Object at the beginning, after i have to create and persist a competition object in which i have to put some of the already created/persisted squads ... ) at ch.hsr.gymtastic.technicalServices.database.DBConnection.commit(DBConnection.java:46
55

Is it ok to put list or map of embeddable objects in entity ?

Hi, Is it ok to put list or map of embeddable objects in entity? I mean, for example : @Entity ... >()) on an entity that had some Class_B instances in bList? Will they be deleted correctly from database ... not found". I found an option to put a classpath for persistence objects and metadata, where I
55

Using the wrong class to access a database

the Point database described in the Getting Started section: package com.objectdb.tutorial ... if I can access the database from here. This program is almost the same as the first; it only calls ... are working fine, but the third ruins the database: - The number of entries is zero. - running the app
11

Database File Compression

ObjectDB database files are usually smaller than database files of other Database Management Systems (object databases and relational databases) but additional internal compression is still possible ... . So the effect of using compressed ObjectDB database file on performance is unknown yet. support Support
2

Step 4: Add a Servlet Class

the database. All the Guest entity objects are retrieved from the database and stored in the request's ... response) throws ServletException, IOException { // Obtain a database connection ... , response); } finally { // Close the database connection: if (em
2

Step 4: Add a Servlet Class

) - a new Guest entity object is constructed and stored in the database. All the Guest entity objects ... , IOException { // Obtain a database connection: EntityManagerFactory emf ... { // Close the database connection: if (em.getTransaction().isActive

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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