Ah! That's where the SQL Developer pathname for java.exe is!

I keep forgetting where the java.exe located in my Oracle client, so I left myself a note here ;)

When opening a SQL Developer for the first time after the new client installed, you will get a prompt like this below:

The path is pretty simple, but if you have to install the Oracle client every once a while, finding the specific file can be frustrating.

Here it is:

C:\Oracle\client\product\12.1.0\client_1\jdk\bin\java.exe

Note: your Oracle home path may be different from mine above.