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  1. JDK
  2. JDK-8133521

(fs) Paths.get(null); throws NullPointerException

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P4
    • Resolution: Not an Issue
    • Affects Version/s: 8u51, 9
    • Fix Version/s: 9
    • Component/s: core-libs
    • Labels:
    • Subcomponent:
    • CPU:
      x86
    • OS:
      linux

      Description

      FULL PRODUCT VERSION :
      java version "1.8.0_05"
      Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
      Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)


      ADDITIONAL OS VERSION INFORMATION :
      Linux xxx 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u1 x86_64 GNU/Linux

      A DESCRIPTION OF THE PROBLEM :
      java.lang.NullPointerException
      at sun.nio.fs.UnixPath.normalizeAndCheck(UnixPath.java:77)
      at sun.nio.fs.UnixPath.(UnixPath.java:71)
      at sun.nio.fs.UnixFileSystem.getPath(UnixFileSystem.java:281)
      at java.nio.file.Paths.get(Paths.java:84)

      when using Path p = Paths.get(null);

      There is no javadoc indicating the NullPointerException, and according to the javadoc it should throw "InvalidPathException - if the path string cannot be converted to a Path"

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Just use Paths.get(null); on an unix system (which will use UnixPath)

      I just tested other things on windows :
      Paths.get(null) leads to :
      Exception in thread "main" java.lang.NullPointerException
      at java.nio.file.Paths.get(Paths.java:132)
      at atest.test.main(test.java:15)

      and Paths.get((String)null); leads to :
      Exception in thread "main" java.lang.NullPointerException
      at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:98)
      at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77)
      at sun.nio.fs.WindowsPath.parse(WindowsPath.java:94)
      at sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:255)
      at java.nio.file.Paths.get(Paths.java:84)
      at atest.test.main(test.java:16)




      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      I expect some javadocs comments or correct exceptions to be thrown (IllegalArgumentException ?)
      ACTUAL -
      Multiple different errors depending on the platform and the signature of Paths.get used.

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      public static void main(String[] args) {
      try {
      Paths.get(null);
      } catch (Exception e) {
      System.out.println("Path.get(URI) with null arg error");
      e.printStackTrace();
      }
      try {
      Paths.get((String) null);
      } catch (Exception e) {
      System.out.println("Path.get(String...varargs) with null arg error");
      e.printStackTrace();
      }
      }
      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Null check before using Paths.get() with "if"

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            • Assignee:
              bpb Brian Burkhalter
              Reporter:
              webbuggrp Webbug Group
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              Dates

              • Created:
                Updated:
                Resolved: