In windows 10, I needed to go to following folder and change following product.conf file and set SetJavaHome directive.
%APPDATA%sqldeveloper<product-version>product.conf
in my machine:
C:Usersati_oAppDataRoamingsqldeveloper17.4.0product.conf
with following line.
SetJavaHome C:Toolsoraclejdk8
Thanks to comment from @thatjeffsmith, in MacOS or Linux/Unix, go to:
$HOME/.sqldeveloper/<product-version>/product.conf
to set same SetJavaHome directive.
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