Using the BC4J with JDeveloper

What exactly is the meaning of business logic in BC4J?
It says thatBC4J Entity objects encapsulate the business
logic.
What is this business logic?
Is it the Primary Key/Foreign key relationship between
tables?

There is a thriving JDeveloper forum. ( It is visited by members of the Oracle Java tools teams like Steve Muench and Chris Schalk, and so doesn't depend so much upon self-styled experts like me :P ). You'll find it JDeveloper and ADF.
Business logic are rules regulating the use of the entity. This includes not just integrity constraints but also things like default values, check constraints, etc. In a sense this duplicates stuff that can be defined in the database, but (a) some java heads don't like squirming around in the primordial ooze of SQL and (b) because it's Java we can write stuff programmatically, which gives more flexibility than the CHECK CONSTRAINT syntax permits.
Cheers, APC

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How to use BC4J with JDeveloper 9i in a Team

Hello
I'm not sure if I'm to stupid, but to say the truth I didn't found the clue how to share a BC4J Application between several develeopers. Maybe someone can give me a hint.
That's my situation:
Our team is going to develop a web application using BC4J and BC4J-JSP, nothing special I think.
But my problem is, that BC4J and especially the wizards refer to a lot of different files. Even simple changes often result in multiple files being changed in different parts of the project.
Creating a view link between view objects in two packages for example changes the view objects in both packages. Also the project (.jpr) file or several "BC4J.xcfg" files are changed very often.
So it is not easy to find parts of code from which I can say they are owned by one developer and others which are owned by another. Most often, if you have to merge the work of different developers, you have to edit the BC4J-XML-Files using an external editor. Or did someone find a better way? Please tell me!
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Should I partition the application by packages?
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it allows a fine partitioning
- disadvantages:
it has the great danger that BC4J makes changes in other packages which will be overseen when merging.
Should I create a projects for each developer and distribute code between the projects using libraries?
- advantage: no unseen changes will happen, as the libraries are readonly.
- disadvantages: no view links between view objects in different projects (Libraries) are possible! Also a lot of "load errors" can occure when updating a library, which have to be manually corrected in the dependent projects.
Are source code management systems a real help in this problem or do they just "manage" the problem? I already tried SCM and PVCS but was not very happy with the way of working. As JDeveloper is not "really easy" to use with theese tools.
So I would like to get any hints how other developers are dealing with this problem. Are you using BC4J with JDeveloper 9i in a team? Please tell me how do it and how you have partitioned your application.
Thanks in advance
Frank Brandstetter

Hi,
I'm not sure whether my answer is good enough for you, but it might help.
First of all, you have to use JDev 9.0.3, because 9.0.2 has big problems with associations/view links between objects in different projects.
Creating a view link between view objects in two packages for example changes the view objects in both packages. Also the project (.jpr) file or several "BC4J.xcfg" files are changed very often.This is not completely true in 9.0.3, as you may choose not to create an accessor in the imported object (and usually you don't need it neither!). As for bc4j.xcfg, there is a trick: define a "standard" database connection name to use all over your project! This will prevent modifying these files all the time!
Should I create a projects for each developer and distribute code between the projects using libraries?
- advantage: no unseen changes will happen, as the libraries are readonly.
- disadvantages: no view links between view objects in different projects (Libraries) are possible! Also a lot of "load errors" can occure when updating a library, which have to be manually corrected in the dependent projects.I would say, projects for each application component, which by chance will be managed by a single developer at a time.
As for the disadvantages, in 9.0.3 you are able to properly create associations and links using read-only objects. Hopefully, the release version will solve some generation inconsistencies...
Concerning the errors that occur when modifying a library, this might be balanced by the relative independence of the components... If you are able to develop following the dependency tree, you will not meet the problem very often.
Are source code management systems a real help in this problem or do they just "manage" the problem? I already tried SCM and PVCS but was not very happy with the way of working. As JDeveloper is not "really easy" to use with theese tools.Indeed, I do not have a SCMS really able to manage merges in the BC4J XML files... We rather try not to arrive there!
So I would like to get any hints how other developers are dealing with this problem. Are you using BC4J with JDeveloper 9i in a team? Please tell me how do it and how you have partitioned your application.I really hope that my hints will help.
Regards,
Adrian

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