I have no personal knowledge of this, but just searching the web I see something you might look over:
Reading toward the bottom of that discussion, you will see mentioned some Java system options:
You can pass such options to SQL Developer by adding AddVMOption lines in your sqldeveloper.conf file.
SQL Developer Team
P.S.: But on the other hand, a recent post on this forum indicates that approach may not work:
but another states the user had success:
Message was edited by: GaryGraham