How to get Oracle SQL Developer display Asia language correctly for US7ASCII database?

Hi:

Somebody asked me this question few days ago, but I don't know how to get it resolved.

The database use US7ASCII character set, and they decide to use Oracle SQL Developer as the client development tool, want to save the license cost of PL/SQL Developer. But found that the Asia language cannot be displayed correctly.

I did some test (see the following link), but it work only for console program, not for GUI program.

http://www.dbatools.net/experience/java_jdbc_aisa_language.html

Thanks.

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