Two JDeveloper versions together

Hi all,
may I use a project built under JDeveloper 9.0.5 in the new JDeveloper 10.1.3 and then continue using the project in 9.0.5 ?
I want to use the new features of 10.1.3 but having my production environment in 9.0.5.
Can JDeveloper 10.1.3 compile my classes with JDK 1.4.2 ?
Thanks in advance.
Marcelo.

The project file structure in 10.1.3 is different from the one in 9.0.5 so you won't be able to reopen your project in 9.0.5 once you opened it in 10.1.3.
See this document:
http://www.oracle.com/technology/products/jdev/101/collateral/101/migratingjdeveloperprojectsto1013.pdf
One thing you might be able to do is create a new project in 10.1.3 and point it to the source code and just work on it in 10.1.3.
In any case make a backup of your 9.0.5 version before any of these games.

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