'Java Class Version Mismatch: How to Fix the 'Compiled by a More Recent Java Environment' Error?'

Java Class Version Mismatch: "Compiled by a More Recent Java Environment"

During script execution, you may encounter an error message in Eclipse: "Class has been compiled by a more recent version of the Java Environment." This indicates a version mismatch between the compiled code and the installed Java Runtime Environment (JRE).

Problem Details

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

Error Explanation

The error message suggests that the code was compiled using a newer version of Java (version 9) than the JRE installed on your system (version 8). Major Java updates increase the class file version number.

Solution

To resolve the issue, update your JRE to version 9 or higher:

• Navigate to the Java download page.
• Select the appropriate Java version (9 or later).
• Download and install the JRE.

Class File Version Numbers

For reference, here is a correspondence between Java versions and class file versions:

• Java 5: Class file version 49
• Java 6: Class file version 50
• Java 7: Class file version 51
• Java 8: Class file version 52
• Java 9: Class file version 53
• Java 10: Class file version 54
• ...
• Java 21: Class file version 65

Ensure that the JRE you install matches the version used to compile the code.

The above is the detailed content of 'Java Class Version Mismatch: How to Fix the 'Compiled by a More Recent Java Environment' Error?'. For more information, please follow other related articles on the PHP Chinese website!