Not sure I follow you and it's pretty clear that you have been misinformed.
If you're using JDeveloper 18.104.22.168, you need JDK 1.6. Go to http://www.oracle.com/technetwork/developer-tools/jdev/documentation/index-091111.html that says 22.214.171.124 corresponds to FMW 126.96.36.199 and WL 10.3.6. The certification matrix shows these both need JDK 1.6. The compatibility matrix that shows this can be reached by going to Oracle Fusion Middleware Supported System Configurations - > search for "BPM" on the page -> if you're in the 11g section, click on "xls". This will take you to http://www.oracle.com/technetwork/middleware/downloads/fmw-11gr1certmatrix.xls.
For JDeveloper, also make sure that you've installed the 32 bit version of the JDK and not the 64 bit version of the JDK. This also has caused an issue with the drag and drop problem you are seeing. Stuart Fleming addresses this here - https://community.oracle.com/thread/3515829.