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  1. JDK
  2. JDK-8177809

File.lastModified() is losing milliseconds (always ends in 000)

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    • Subcomponent:
    • Resolved In Build:
      b09
    • CPU:
      x86_64
    • OS:
      linux
    • Verification:
      Verified

      Backports

        Description

        FULL PRODUCT VERSION :
        openjdk version "1.8.0_121"
        OpenJDK Runtime Environment (build 1.8.0_121-b14)
        OpenJDK 64-Bit Server VM (build 25.121-b14, mixed mode)


        ADDITIONAL OS VERSION INFORMATION :
        Linux ess-hwvj 4.10.5-200.fc25.x86_64 #1 SMP Wed Mar 22 20:37:08 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux


        A DESCRIPTION OF THE PROBLEM :
        File.getLastModified() always returns with second precision, loosing the milliseconds (i.e. a number ending in 000). I tried using Files.getLastModifiedTime and it seems to work correctly.

        STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
        Create and run the following the FileTest class added to the source-code for test case


        EXPECTED VERSUS ACTUAL BEHAVIOR :
        EXPECTED -
        Test f.lastModified [1490606336718]: true
        Test Files.getLastModifiedTime [1490606336718]: true

        ACTUAL -
        Test f.lastModified [1490606336000]: false
        Test Files.getLastModifiedTime [1490606336718]: true


        REPRODUCIBILITY :
        This bug can be reproduced always.

        ---------- BEGIN SOURCE ----------
        import java.io.File;
        import java.io.IOException;
        import java.nio.file.Files;

        public class FileTest {
            private static final long LM = 1490606336718L;

            public static void main(String[] args) throws IOException {
                File f = new File("test.txt");
                f.createNewFile();

                f.setLastModified(LM);

                System.out.printf("Test f.lastModified [%s]: %b\n",
        f.lastModified(), f.lastModified() == LM);
                System.out.printf("Test Files.getLastModifiedTime [%s]: %b\n",
        Files.getLastModifiedTime(f.toPath()).toMillis(),
        (Files.getLastModifiedTime(f.toPath()).toMillis() == LM));

                f.delete();
            }
        }
        ---------- END SOURCE ----------

        CUSTOMER SUBMITTED WORKAROUND :
        Call Files.getLastModifiedTime(f.toPath()).toMillis() instead of f.lastModified()

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                Assignee:
                bpb Brian Burkhalter
                Reporter:
                webbuggrp Webbug Group
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                  Dates

                  Created:
                  Updated:
                  Resolved: