How to develop plSQL Packages using jDeveloper

Working in one schema with multiple packages and having multiple programmers all working at the same time with in the schema and packages. How do you all work on maybe the same package at the same time and not walk on each other(save code over each other and lose updates)? In other words programmer A opens A_WEBFORMS.WF_HR.SICKVACREQ; then programmer B also opens A_WEBFORMS.WF_HR.NOTARY. Both are in same schema, same package, but different procedures with in package. Both update the package by using ctrl-s. This causes them both to lose code or just get mixed up when programmer A saves and the part that programmer B is working on changes.
Help? Is it the way you setup the Oracle DB?, or is it the total environment?, or is it the way you use Jdeveloper????

If you develop directly against the database into the same schema, you have the risk off bumping into somebody else. The more developers work on the same project the more the need to work with an external tool to develop your code (and tables, views, etc). In the past it would be Oracle Designer, recently JDeveloper is getting more and more suitable for the job.
If you are using JDeveloper you should use offline database objects and put them under version control. During the development process, version control will offer the abillity to merge different versions of a single object the programmers are working on. When generating to the database you synchronize the database with your code in jdeveloper, when an other user generates his version over yours, at least you will not lose your version of the object, since you still have it as an offline database object. Anyway, let users generate to their own database schema, so they will not influence other users code. Certain revisions can then be generated from time to time to the actual database schema from the version controlled offline database objects.
Just my two cents ...

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