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  1. JDK
  2. JDK-8323811

Setting java.io.tmpdir programatically does not work since Java 20

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    • generic
    • generic

    Description

      ADDITIONAL SYSTEM INFORMATION :
      tested on linux and windows

      A DESCRIPTION OF THE PROBLEM :
      java.io.File.createTempFile("xyz", ".tmp") uses default temp-dir event if
      System.setProperty("java.io.tmpdir", ...); was set before.

      It seems that this was changed between java 19 and 20

      One possible change was in java.nio.file.TempFileHelper
      from
      private static final Path tmpdir = Paths.get(doPrivileged(new GetPropertyAction("java.io.tmpdir")));
      to
      private static final Path tmpdir = Path.of(StaticProperty.javaIoTmpDir());

      StaticProperty is loaded very very early and therefore jdk.internal.util.StaticProperty.JAVA_IO_TMPDIR contains the default temp-dir.
      -> I know that java.io.tmpdir has to be set early in application but currently even a simple main-method is not able to change the java.io.tmpdir (see steps to reproduce)

      REGRESSION : Last worked in version 19

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      call System.setProperty("java.io.tmpdir", ...) on application start, create temp-file and check the directory.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      no exception
      ACTUAL -
      exception beginning with java 20

      docker run -it --rm -v $PWD:/test -w /test eclipse-temurin:11-jdk sh -c "javac Test.java && java -cp . Test"
      11.0.21
      /tmpfoobar
      /tmpfoobar/xyz12142257841535750632.tmp

      docker run -it --rm -v $PWD:/test -w /test eclipse-temurin:17-jdk sh -c "javac Test.java && java -cp . Test"
      17.0.9
      /tmpfoobar
      /tmpfoobar/xyz3659998787174078425.tmp

      docker run -it --rm -v $PWD:/test -w /test eclipse-temurin:19-jdk sh -c "javac Test.java && java -cp . Test"
      19.0.2
      /tmpfoobar
      /tmpfoobar/xyz16800814432785594764.tmp

      docker run -it --rm -v $PWD:/test -w /test eclipse-temurin:20-jdk sh -c "javac Test.java && java -cp . Test"
      20.0.2
      /tmpfoobar
      /tmp/xyz7255378145959570555.tmp
      Exception in thread "main" java.lang.IllegalStateException: actual: /tmp, expected: /tmpfoobar
              at Test.main(Test.java:14)

      docker run -it --rm -v $PWD:/test -w /test eclipse-temurin:21-jdk sh -c "javac Test.java && java -cp . Test"
      21.0.1
      /tmpfoobar
      /tmp/xyz1465904699981539377.tmp
      Exception in thread "main" java.lang.IllegalStateException: actual: /tmp, expected: /tmpfoobar
              at Test.main(Test.java:14)


      ---------- BEGIN SOURCE ----------
      public class Test {
        public static void main(String[] args)
         throws Exception
        {
          final java.io.File tmp = new java.io.File("/tmpfoobar");
          tmp.mkdirs();
          System.setProperty("java.io.tmpdir", tmp.getAbsolutePath());
          java.io.File testFile = java.io.File.createTempFile("xyz", ".tmp");
          System.out.println(System.getProperty("java.version"));
          System.out.println(tmp.getAbsolutePath());
          System.out.println(testFile);

          if (!tmp.getAbsolutePath().equals(testFile.getParent()))
            throw new IllegalStateException("actual: " + testFile.getParent() + ", expected: " + tmp.getAbsolutePath());
        }
      }

      ---------- END SOURCE ----------

      FREQUENCY : always


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              webbuggrp Webbug Group
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                Created:
                Updated:
                Resolved: