Fast Object Database for Java - with JPA/JDO support

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Listing large number of complicated objects with paging.

.578 [http-bio-8080-exec-3] DEBUG pl.hplxtool.dao.impl.ProductDAOImpl - Query: [select prod from Product prod order by ASC] 2011-11-15 19:30:59.578 [http-bio-8080-exec-3] DEBUG pl.hplxtool.dao ... .hplxtool.dao.impl.ProductDAOImpl - Start: 250, count: 50 2011-11-15 19:31:03.219 [http-bio-8080-exec-3

Exception on the recovery of a database

.objectdb.jpa.EMF.createEntityManager( at rbccm.felix.gridservice.admin.dao.ConnectionManagerFactory.createEntityManager(Unknown Source) at rbccm.felix.gridservice.admin.dao.HistoryArchiver.populateArchive(Unknown Source) at rbccm.felix.gridservice.admin.dao.HistoryArchiver.moveHistory

Querying error - java.lang.ClassCastException: com.objectdb.o.STV

( at rbccm.felix.gridservice.admin.dao.SimpleWorkflowInstanceDao.pagedQuery(Unknown Source) at rbccm.felix.gridservice.admin.dao.SimpleWorkflowInstanceDao.query(Unknown Source ... .gridservice.admin.dao.SimpleWorkflowInstanceDao.pagedQuery(Unknown Source) at rbccm.felix.gridservice.admin

best practice for DB recovery

have two(or more) entity managers in my DAO layer and write all changes to both instances(may have IDs ... instance, restart the failed instance and then enable writes again(that will be controlled in the DAO ... in your DAO layer but it may be affected by similar technical challenges. But instead of writing

Activation Issue

( at $Proxy37.find(Unknown Source) at com.googlecode.genericdao.dao.jpa.JPABaseDAO._persistOrMerge( at at com.contextspace.dao.impl.BaseDAOImpl.create(

Freeze during save

) at com.spiffymap.naviupdate.dao.repository.RepositoryJdoDao.lambda$save$2( at com.spiffymap.naviupdate.dao.repository.RepositoryJdoDao$$Lambda$60/ Source) at

PersistenceException UserException: Failed to validate persistence.xml

( at net.heatboxes.dao.DaoService.( at net.heatboxes.dao ... .Provider net.heatboxes.dao.entity.UserEntity

Negative snapshot user count

) at com.objectdb.jpa.JpaQuery.executeUpdate( at rbccm.felix.gridservice.admin.dao.HistoryArchiver.moveHistory(Unknown Source) at rbccm.felix.gridservice.admin.dao.HistoryArchiver.access$400(Unknown Source) at rbccm.felix.gridservice.admin.dao.HistoryArchiver$ Source

Can't open replicated database

.felix.gridservice.admin.dao.ConnectionManagerFactory.createEntityManager(Unknown Source) at rbccm.felix.gridservice.admin.dao.SimpleWorkflowInstanceQueryDao.queryInstance(Unknown Source) at rbccm.felix.gridservice.admin.dao.SimpleWorkflowInstanceQueryDao.queryComplete(Unknown Source) at rbccm.felix

Entity Type is not found (error 301) in Query

dao, UpdateMap update) throws Exception {     List list = null;     HashMap) dao.query(             "select u from " + User.class ... ());          map.put("email", m.getString());          list = (List) dao.query

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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