db4o Developer Community

Are the db4o database files compatible across platforms? I saved a database file in .NET Compact Framework 2.0. I move the file over to another computer that has db4o JAVA version, and it won't open it. I know my Java version is working because it can create and open a new database file made in Java fine. Why won't it open the one saved by the CF ...

Hi I am upgrading my db4o db from version 6.3 to 7.2 but seams to get some sort for error. With my db manager I can see my objects and defragment in version 6.3 but after upgrading the Defragmentation fails (I can still browse my objects now in v. 7.2). The defragmentation gives me folloving ...

Hi I am a contributor to the google-guice community and open source java in general. We maintain integration modules between guice and several ORM frameworks. It seemed logical to have a db4objects alternative, and one of our contributors was kind enough to provide one. db4o is one of my long-time favorites, and we've had good success combining ...

Hi, I keep getting from ant output [db4o:enhance] Processing oopex.db4o7.nat.usecases.model.Person[db4o:enhance] enhance oopex.db4o7.nat.usecases.model.Person: skipped when trying to enhance my model classes at build time. What am I doing wrong? My environment is java 5, db4o-7.2, ant-1.7.0

Edwin, Thanks for your reply and suggestions. I will look more closely in the reference documents... I also tried to incorporate your Configuration suggestions. My server code now reads:             Configuration config = Db4o.newConfiguration();           ...

Okay, I finally figured out what the problem was with my NQ in Client/Server.  It basically came down to the anonymous inner class and how DB4O sends the query over the network to the server.  It wasn't able to serialize it correctly, so the query didn't work.  I moved my Predicates out of the dao class and into their own.  ...

*** Java Version 6.1 ***  I am trying to compile the StartServer and StopServer examples but I keep getting the following compilation errors: StartServer.java:19: cannot find symbolsymbol  : method setMessageRecipient(com.db4odoc.clientserver.StartServer)location: interface ...

Hi,  I'm using db4o in a java environment and Apache Avalon/Excalibur as my component framework. Working with the local mode everything works fine for me. But switching to embedded client-server mode a ObjectNotStorableException is throws while performing native queries. I recognized that after the exception is thrown the db4o object manager ...

Hello all, i'm newbie to db4o (and java for this matter). i was trying to work some queries using the ObjectContainer.query method passing a predicate like this: java.util.List <Pilot> pilots = objectContainer.query(new Predicate<Pilot>(){ public boolean match(Pilot pilot) {        return ...