JDK-8078672 : Print and allow setting by Java property seeds used to initialize Random instances in java.lang numerics tests
- Type: Bug
- Component: core-libs
- Sub-Component: java.lang
- Affected Version: 9
- Priority: P4
- Status: Closed
- Resolution: Fixed
- Submitted: 2015-04-27
- Updated: 2016-06-13
- Resolved: 2015-04-29
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| JDK 9 |
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9 b63Fixed  |
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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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