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TAMAYA-391 test for system properties that exist in all java versions #28
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Turns out openjdk 12 has changed the default value of "sun.os.patch.level". In java 11 and below, a missing value was replaced with the string "unknown". As of java 12, a missing value is null. There was a notice released for the equivalent change for "user.timezone" but not for "sun.os.patch.level". https://bugs.openjdk.java.net/browse/JDK-8213629
The change is visible here http://hg.openjdk.java.net/jdk/jdk/rev/b915bd68d907#l7.8