Did some further investigations, on other third party drivers ... If indeed the case, what could be done to overcome this?That is the case. Currently browsing and migration support for third-party databases is limited to the following:
oracle.sqldeveloper.thirdparty.browsers.jarthen browse it to see the various class, properties, and xml files necessary for supporting connections to databases like mysql or sybase. You may conclude adding browsing support is not all that complicated. Migration support is an entirely different matter, however. Oracle is the thirdparty.browsers extension owner. Support for more third-party databases would normally be added by the SQL Developer group based on a database's general popularity or a feature request on the SQL Developer Exchange -- obviously a long-term proposition.