On date July,14 2009 has been release the new release of sql_developer. The old ebuild worked like a charm, you need just a little fix (patch attached). thank you
Created attachment 200245 [details, diff] patch to actual ebuild due to stricter dependency version As specified by Oracle, mysql jdbc have to be < than rev. 5.1 http://download.oracle.com/docs/cd/E12151_01/doc.150/e12153/install.htm#CIHIHDIF
*** This bug has been marked as a duplicate of bug 297775 ***