If SQL Developer can't locate your Java installation, you'll see a prompt asking for the JDK path. Enter only the folder path, not the full path to java.exe . For example:
Your connections.json file may be corrupted. download sql developer 21.4.3
When you launch version 21.4.3 for the first time, follow these interactive steps: If SQL Developer can't locate your Java installation,
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: Double-click sqldeveloper.exe (Windows) or run sqldeveloper.sh (Linux/Mac) to start the application. Key Requirements & Fixes in 21.4.3 Oracle SQL Developer Downloads 21.4.3