Are you using the latest and greatest or are you stuck on an older version?
Let us know.
If you are using more than one version pick the most recent one.
Which JDeveloper Version Are You Currently Using
JDeveloper 12.2.1.1: 6
JDeveloper 12.2.1.0: 2
JDeveloper 12.1.3: 3
JDeveloper 12.1.2: 1
JDeveloper 11.1.2.*: 3
JDeveloper 11.1.1.9: 1
JDeveloper 11.1.1.7 or another 11.1.1.*: 7
Older version: 0