Summary

Modify implementation such that java.nio.file.Path.of(String first, String... more) and java.nio.file.Paths.get(String first, String... more) throw a NullPointerException when first is null.

Problem

The package specification of java.nio.file states that

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.

but the aforementioned methods do not throw a NullPointerException. This is incorrect behavior not only due to failing to throw the exception, but more in terms of allowing a corrupted path name containing the string "null" to be created. This could lead to unexpected and possibly confusing behavior.

Solution

Modify the implementations of getPath(String first, String... more) in the UnixFileSystem and WindowsFileSystem classes in the internal sun.nio.fs package such that they throw NullPointerException if the first parameter first is null. Paths.get calls Path.of() which calls XFileSystem.getPath().

Specification

There is no change to the existing specification per se.