How to Resolve the \"UnsupportedClassVersionError: a (Unsupported major.minor version 51.0)\" Exception in Java?

Exception "UnsupportedClassVersionError: a (Unsupported major.minor version 51.0)" in Java

Issue:

A Java program is encountering the "UnsupportedClassVersionError" exception when executed, indicating a discrepancy between the Java versions used for compilation and execution. Despite installing JDK7, the system is using an older version of the JRE.

Possible Resolution:

To resolve this issue, the user should update the system's Java runtime environment (JRE) to match the version used for compilation. Follow these steps:

1. Open a terminal.
2. Run the command sudo update-alternatives --config java to display a list of available Java versions.
3. Select the desired Java version to use, typically the latest installed version.
4. Press Enter to confirm the selection.

This should update the system's JRE and resolve the "UnsupportedClassVersionError" exception. It is also recommended to verify the Java version installed by running java -version in the terminal.

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