I've downloaded and unpacked Oracle's SQL Developer 19.4 on macOS 10.15 Catalina. During the first start up, the usual warning appears, which I clicked away as I do since a number of years: SQL Developer starts ok. When creating a new connection to an Oracle database, I enter all the detail and it works fine (the 'Test' button says it's ok. Previously, only JDK 8 worked with Oracle SQL Developer. But, per JDK 8 or 11 are required. (there is some misleading documentation that says JDK 8 or higher, but it must be 8 or 11). Also, per Oracle, JDK 11.0.7 is certified for Mac OS Catalina. I’m running SQL Developer 14.1.3.20.78 on Mac OSX El Capitan 10.11.5, Java SDK 1.8.092 installed; The program works, but extreeeeemely slow, as in “not working”. When I click something, the program seems to have problems “drawing” the objects.
After upgrading to macOS Big Sur I couldn’t run Oracle SQL Developer. I got the following error: The application “SQLDeveloper.app” can’t be opened
To resolve this issue I got help from Kris Rice and Niels de Bruijn. The issue is caused by Apple and the Java applet plugin.
Here’s how I got SQL Developer working:
Sql Developer For Macos Catalina
List your Java Versions
Oracle Sql Developer Download Mac
The one that caused the problem is the 'Oracle Corporation' - 'Java' /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home and you’ll need to remove it.
Remove the Applet Plugin
Sql Server Mac Os
If you run SQL Developer now it should work. I’m not sure about the side effects of removing this Java applet plugin. If I find it to be critical to other things I’ll be sure to update this post.