To transform a Java Preferences node/key pair into an APOC component and path, the first three node path elements (or all node path elements if less than three are present) will be appended to java.prefs to form a component name and the remainder of the node path elements and the key will form the path. Only user preferences are considered.
node /com/sun/star/configuration, key someKey becomes java.prefs.com.sun.star/configuration/someKey,
node /com/acme/widget, key someKey becomes java.prefs.com.acme.widget/someKey,
node /sample.Dir, key someKey becomes java.prefs.sample.Dir/someKey.