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Class has been compiled by a more recent version of the Java Environment

While running a script, I am getting the following error message in the Eclipse console:

Class has been compiled by a more recent version of the Java Environment (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0.

  • Java Version: 8
  • IDE: Eclipse v4.7 (Oxygen)
  • Firefox version: 46
Solution

  • This is just a version mismatch. You have compiled your code using Java version 9 and your current JRE is version 8. Try upgrading your JRE to 9.

    49 = Java 5
50 = Java 6
51 = Java 7
52 = Java 8
53 = Java 9
54 = Java 10
55 = Java 11
56 = Java 12
57 = Java 13
58 = Java 14
59 = Java 15
60 = Java 16
61 = Java 17
62 = Java 18
63 = Java 19
64 = Java 20
65 = Java 21