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  1. JDK
  2. JDK-8078672

Print and allow setting by Java property seeds used to initialize Random instances in java.lang numerics tests

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: core-libs
    • Subcomponent:
    • Resolved In Build:
      b63

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        Description

        The tests listed below use an instance of Random initialized as

        Random prng = new Random();

        and do not print the seed as this is in any case impossible to obtain from an instance so created. The suggested fix is create the Random instance in a manner which allows the seed to be printed. A second part of the fix is to allow setting the seed via a Java property such as

        -Dseed=42

         which would be useful in debugging a failure should one occur.

        The affected tests are

        test/java/lang/Double/ParseHexFloatingPoint.java
        test/java/lang/Integer/BitTwiddle.java
        test/java/lang/Long/BitTwiddle.java test/java/lang/RandomSeedFactory.java
        test/java/lang/Math/CubeRootTests.java
        test/java/lang/Math/HypotTests.java
        test/java/lang/Math/IeeeRecommendedTests.java
        test/java/lang/Math/Log1pTests.java

        Note that there are a few other numerics tests under java.lang which use Random with a hard-coded seed of zero and these do not need to be addressed by this issue.

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                • Assignee:
                  bpb Brian Burkhalter
                  Reporter:
                  bpb Brian Burkhalter
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