Upon further review appears to be a known issue. I am hoping the developer has the time to make the change.
Anyone have a link to the SQL Developer extention developer process?
Does not appear to lanch in SQLD 4.0 anymore?
None of the pre-4.0 extensions will work with the new OSGI framework that JDeveloper/SqlDeveloper use. The extensions have to be modified.
As yet the developer has not modified that extension to work with the new version.
See the note on the sql developer extensions exchange:
Special Note Regarding Extensions Developed Prior to SQL Developer v4.0:
With the new release of SQL Developer 4.0, an extension that was written for a previous version of SQL Developer will no longer work. SQL Developer is built on the JDeveloper Framework. We have updated the framework to be current with the JDeveloper 12c release. With JDeveloper 11gR2, they switched to an OSGI framework. The JDeveloper team has published instructions for updating your extensions to be compatible with the new framework and SQL Developer v4.0.
The Check for Updates interface has been updated to hide any 3rd party extensions to avoid confusion with extensions not loading. Once you have updated your extension for version 4 and beyond, let us know, and we'll update the system to make it available again. For questions regarding the process of going from the old to new framework, we have started a dedicated thread on the Forums. You can also email the Product Manager, Jeff Smith, to setup a call with one of our developers for additional assistance.