JDeveloper Versions Explained
By Oliver Steinmeier-Oracle on Feb 06, 2013
Fusion Applications Release 5: JDeveloper 126.96.36.199.3
It is important to note that all these JDeveloper versions belong to the 11gR1 “series” — 11.1.1.x. If you look for JDeveloper on OTN, you will find versions of a newer series, 11gR2: 11.1.2.x. The multi-segment version numbering scheme that Oracle uses may lead people to conclude that the differences between 11.1.1.x and 11.1.2.x should be minor. That is not correct. The 11gR2 versions are not certified with Fusion Applications. One reason is that in 11gR2 the extension/plugin architecture for JDeveloper changed to OSGi, and not all the extensions needed for Fusion Applications work are available yet in an OSGi-compatible implementation.
JDeveloper Download Page on OTN