How to Fix java.lang Illegal Argument Exception Unsupported Class File Major Version 61

The "Unsupported class file major version 61" error in Java indicates that you are attempting to run a Java program compiled with a newer version of the Java Development Kit (JDK) than your current runtime environment supports, specifically Java SE 17. To resolve this issue, you can either update your Java runtime to version 17 or higher or recompile the program using an older JDK version compatible with your environment. Recompiling might involve adjusting your code to ensure compatibility with the older Java version if it uses features from newer versions. This process includes installing the older JDK, configuring your development environment, adjusting IDE settings, and setting source and target compatibility in build tools like Maven or Gradle. Additionally, tools like Rollbar can help manage and monitor errors in real-time, providing a more confident approach to handling Java exceptions and deploying production code.

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