Fast Object Database for Java - with JPA/JDO support

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Significant I/O costs during batch update or insert data.

Our application has some complex entities. We do batch update(merge detached entity) every 2 minutes. We find the period significant IO costs these days, and disappeared when turn off the batch updating. 1.ObjectDB is in embedded mode. 2.ObjectDB version is 2.3.7 3.Database file size is nearly

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

a detached entity object (e.g. after clear). It doesn't seem to be related to the IDE that you use. support

Merge Issue: Attempt to reuse an existing primary key value

, #4), merge is not really needed. It may be better to use merge only to attach detached objects

How to disable Transparent Update.

for your reference. ObjDBUser3 ObjectDBUser You cannot disable transparent update. You can detach the first

Post-compilation enhancement vs Automatic Run-time enhancement

of is now provided under forum posting: Pre-detach loading: retrieval by navigation not working in

EntityTransaction.commit() does not release a pessimistic lock

.setDetachAllOnCommit(true); In this case entity objects will be detached and unlocked on transaction commit. support Support

Problem with @Basic(fetch = FetchType.LAZY)

from Sample s", Sample.class).getResultList().get(0); em.detach(sample); //just to be sure

ObjectDB 2.4.1

Fixed a bug of duplicating new objects during merge. Fixed a username/password issue in using EntityManagerFactory's getMetamodel. Fixed a bug in detachment of hollow objects on close (issue #799). Fixed a Doctor exception (issue #796). Fixed a Doctor bug in checking byte[] arrays (issue #811

ObjectDB 2.1.0

a bug in viewing TreeSet and TreeMap in the Explorer. Fixed detachment of entities by replacing proxy

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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