Does not happen for everyone -- Wondering if there is a permissions error.
Invalid JDK C:\Users\maitbell\AppData\Roaming\sqldeveloper\21.4.2\"C:\Program Files\Java\jdk1.8.0_171" set by SetJavaHome in file C:\Users\maitbell\AppData\Roaming\sqldeveloper\21.4.2\product.conf
Added SetJavaHome directive C:\Program Files\Java\jdk1.8.0_171 in file C:\Users\bellz\AppData\Roaming\sqldeveloper\21.4.2\product.conf
Exception in thread "main" java.lang.NoClassDefFoundError: org/openide/util/NbBundle
at oracle.ide.osgi.boot.OracleIdeLauncher.main(OracleIdeLauncher.java:228)
Caused by: java.lang.ClassNotFoundException: org.openide.util.NbBundle
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 1 more