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4

Possible issue for JPQL IS EMPTY expression

.getTransaction().begin();         em.persist(new MyEntity());         em.getTransaction().commit
4

Multi part paths in a composite index must have the same length

");         EntityManager em = emf.createEntityManager();                 em.getTransaction().begin();         em.persist
4

JDOHelper.isDetached failure ?

Running this example code: public static void main(String[] args) { PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory("test.odb"); PersistenceManager pm = pmf.getPersistenceManager(); pm.currentTransaction().begin(); TestClass test
4

PersistenceException UserException: Failed to validate persistence.xml

. What is the "!" character at the beginning of the path, is it part of your path? Could you try moving
4

EntityManager refresh problem

.getTransaction().begin();             SimpleEntity simpleEntity1 = new SimpleEntity
4

Memory leak while merging parent with No Cascade annotation with children

().isActive()) {                 em.getTransaction().begin();             }             em
4

Mysterious "Attempt to persist a reference to a non managed instance" error

.getTransaction();       tx.begin();         em.persist(d);       em.persist(dd);       em.persist(o
4

Mapped By Fetch is very Slow

.getTransaction().begin();   }   // Write 100 000 entities with 1 child for each   for (int i=0;i<100000
0

Super class' field access fails

;drop");         EntityManager em = emf.createEntityManager();         em.getTransaction().begin
0

Enhancing a class causes it to not save changes.

anything until flush/commit and then it just compares the content of the object at the beginning of the transaction

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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