been compiled by a more recent version of the Java Runtime (class file version 59.0), this version of the Java Runtime only recognizes class file versions up to 52.0 while running jar code example

Example: has been compiled by a more recent version of the Java Runtime (class file version ), this version of the Java Runtime only recognizes class file versions up to

Java version names in error messages:
49 = Java 5
50 = Java 6
51 = Java 7
52 = Java 8		(or 1.8)
53 = Java 9
54 = Java 10
55 = Java 11
56 = Java 12
57 = Java 13
58 = Java 14

Solutions:
1. Update your JRE to the same version as your JDK
If done manually in cmd:
2. javac --release 8 yourClass.java			(of course insert wanted version number here)
3. javac -source 1.8 -target 1.8  *.java	(Shows warning)

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