Why Am I Getting the Error 'Class has been compiled by a more recent version of the Java Environment'?

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

Encountering this error message during script execution can be frustrating. Let's delve into the problem and its solution:

Issue:

The error indicates a mismatch between the Java version used to compile the class and the current Java Runtime Environment (JRE). When running the script, the class file's version (53.0) is newer than what the JRE (version 52.0) can handle.

Details:

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

Solution:

This issue arises because the code was compiled with a Java version higher than the installed JRE. To resolve it, you can either downgrade your compiler or upgrade your JRE.

Since it's not ideal to downgrade your compiler, the recommended solution is to upgrade your JRE to the latest version. Java version 9 corresponds to class file version 53.0, so upgrading to JRE 9 will ensure compatibility.

Class File Version Mapping:

For reference, here's a mapping of Java versions to class file versions:

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

By upgrading your JRE to 9, you'll be able to execute the compiled class without encountering the error "Class has been compiled by a more recent version of the Java Environment."

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