db4o Developer Community

I'm using db4o, the latest version as of today (7.4), for C# with the .NET Framework 3.5 SP1 on Visual Studio 2008. Q: How do we enable Transparent Activation? The tutorial that comes with the download, specifies this in section 9.2 Turning On Transparent Activation // configureTransparentActivationDb4oFactory.Configure().Add(new ...

is it safe to use transparent Activation/Persistence with Version 7.2 ? I want to use db4o for educational purposes, and I do not want to get into problems, that do not originate in the students'  code. Ingeborg Liedlbauer    

I don't think the TP examples deal with instrumenting third party libraries. There's mention of the ability to instrument jars but I didn't find anything in detail. Maybe I missed that bit - if so, please tell me where it is, but if it's not there yet, please tell me how it's handled. It would help if I knew where to find the API docs for ...

Most of those who pair programmed with me know that I'm not very fond of debugging code by stepping through breakpoints inside an IDE. I'd much rather construct hypotheses on why the code is failing and systematically test them with carefully placed assertions and print statements. One reason for that is the observer effect of debugging: ...

As the popular saying  tell us, there's no such thing as free lunch. It is no different for work related subjects. When we introduced Transparent Activation (TA) concept we knew that it could make developer's life easier (by presenting a simpler model for object life cycle): developers would not be required to think about activation depths ...

I'm testing enhacement tool Db4oTool including a call in the post-buld event (Including Db4oTool in the Build)If I add the param -debug then I can debug the code, setting breakpoints. However, it seems that all the symbols have been eliminated: I can't watch any variable, nor query in the inmediate window. Visual Studio IDE says that ''variable'' ...

I'm having some problems integrating the TP/TA framework to work on my .NET 1.1 data model. My data model contains very complex deep graphs objects and relations. I enhance the DLL using Db4oTool, added the TransparentActivationSupport to the object container as well, but nothing seems to be persisting/activating properly. When adding a listener ...

Hi- I have a problem and it seems it arises from transparent activation. (JDK 1.5.0_15, Db4o 7.2.31.10304)  I'd like to store objects like this: public class MainObject {    private ArrayList4 myObject1;    private ArrayMap4 myObject2;        public MainObject() ...

Thanks for the report, we are tracking this issue here. http://tracker.db4o.com/browse/COR-1219

I wrote a unit test that includes a Linq query against a db40 IObjectContainer. This passed. I wrote a unit test that traverses a deep object graph and so tests for transparent activation (TA). This failed I enabled my test assembly for TA by adding the post-build command : $(ProjectDir)/Library/Db4oTool.exe -ta -nq ...