A DESCRIPTION OF THE PROBLEM :
First argument of java.nio.file.Paths.get(String first, String... more) method allows null parameter and transforms it to "null" string.

Example code:

java.nio.file.Path path = java.nio.file.Paths.get(null, "a");
System.out.println(path);
System.out.println(path.toAbsolutePath());

Output:
null\a
c:\Program Files\Java\jdk-15\bin\null\a

Looks like a bug for me.
Also JavaDoc for java.nio.file package state "Unless otherwise noted, passing a null argument to a constructor or method of any class or interface in this package will cause a NullPointerException to be thrown.".


FREQUENCY : always