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Enhancement
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    Resolution: Fixed
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  P4                     
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    None
 
                    Since jtreg 7.x requires Java 11 to we should replacereflective code to access API from Java 11 and former releases.
For example: `pidMethod = Process.class.getDeclaredMethod("pid"); // only available in Java 9+` as discussed in https://github.com/openjdk/jtreg/pull/215#pullrequestreview-2241473245
For example: `pidMethod = Process.class.getDeclaredMethod("pid"); // only available in Java 9+` as discussed in https://github.com/openjdk/jtreg/pull/215#pullrequestreview-2241473245
- links to
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        Commit(master)
        openjdk/jtreg/852a2c25
    
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        Review(master)
        openjdk/jtreg/277