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javademos/java17-features/output/07-strong-encapsulation.txt

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$ javac src/EncapsulationDemo.java && java EncapsulationDemo (11.0.32.1)
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by EncapsulationDemo (file:/…/) to field java.lang.String.value
WARNING: Please consider reporting this to the maintainers of EncapsulationDemo
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
read String.value: byte[]
$ javac src/EncapsulationDemo.java && java EncapsulationDemo (17.0.20.1)
java.lang.reflect.InaccessibleObjectException: Unable to make field private final byte[] java.lang.String.value accessible: module java.base does not "opens java.lang" to unnamed module @<hash>
$ java --add-opens java.base/java.lang=ALL-UNNAMED EncapsulationDemo (17.0.20.1)
read String.value: byte[]