You can migrate the project  but the changes are very huge although you would not get any error or many difficulity around this changes in version but you will not gain many advantages regarding the migrate.
because one of the main power of 11g is its ADF Faces in UI that when you migrate you can not user the new one too and also the UI is not migrate from the 10g  trinidad to 11g rich faces.
I would be appreciated if you informed me where and the scope of the location/project that you are handling in Jdeveloper.
I hope to be helpful.
And also do you have any ADF 11g programmers wanna be hired?