db4o Developer Community

I am using dRS 6.4 to keep 3 DB4o databases in sync Lets call them db1, db2, and db3.  if I have changes in db1, I can sync it to db2 with no problems, but when I try to replicate db2 to db3 ReplicationSession can't find any changes between those databases. Has anyone seen this behavior before and knows of possible ...

When DRS throws a null pointer due to its inability to find a counterpart, what does this really mean?  I keep coming across this error in my use of Db4O and DRS.  It always occurs when it is trying to replicate the field of an object.  When ever I see this error, it always fails on something that I know is represented in both ...

Dear Forum, Having: ObjectContainer containerA= Db4o.openClient(REMOTE_CREDENTIALS_REMOVED); ObjectContainer containerB=objectserver.openClient();   Doing now: ReplicationSession replication = Replication.begin(containerA,containerB);    Brings: Stack Trace: java.lang.ClassCastException: ...

Hi, wir sind dabei ein MMOG zu entwickeln und ich evaluiere gerade verschiedene Object-DBs um die für uns passenste zu finden. Db4o ist da bisher sehr Interessant, allerdings stellen sich mir da noch einige Fragen die ich mir so aus der Dokumentation und dem Forum nicht ganz beantworten konnte. Ich hoffe ihr könnt mir weiterhelfen:Skalierung: ...

Hi all, I am trying to get a simple replication working between two db4o databases, over a client/server connection, using java5. I kept running into NullPointerExceptions on the loaded objects, and on further investigation, discovered that Hashtable fields were not being replicated. Despite much fiddling with update and activation depths, and ...

Hi. How can I use NHibernate to sync with the Progress(RDBMS) database?

Hello, I'm having some problems with the db4o Replication System. Environment: jdk 1.5.0 11, db4o and dRS 6.3 I have one db4o server and several db4o client databases. When I start a client application the local database needs to be updated with the data from the server database. When I store a object on the client side, it should also update ...

Hi all, I am using db4o 6.0 with drs 6.1 on java6. I have a question regarding drs replication, that i am hoping someone can shed some light on. I preform a replication between 2 d4bo database, which takes sometime especially during the replication of deletion. Hence, my question is during which the replication is taking place can transactions ...

Hallo, ich möchte gerne die Daten eines db4o-Servers mit mehreren Clients abgleichen. Ziele ist, auf jedem beliebigen Client neue Objekte anzulegen und diese durch die Synchronisation mit dem Server mittels dRS auf die anderen Clients zu verteilen. Leider funktioniert der Abgleich nach einer unbestimmtem Anzahl von Replikationsdurchläufen nicht ...

Hi all, I need some assistence please. I am using drs 6.0 and db4o 6.0.1 on java 6. When i carry out a replication i am getting the exception below. This cause my replication to fail. Now how do i deal with this issue. I want replication to continue otherwise it becomes useless and unrecoverable.  ----- java.lang.NullPointerException: ...