Why Am I Getting a 'JNI Error' in My Eclipse Java Project on Windows 8.1?

Encountering a JNI Error in Eclipse with Windows 8.1

When working with Java applications in Eclipse on Windows 8.1, you may encounter the following error message:

"A JNI error has occurred. Please check your installation and try again in Eclipse x86 Windows 8.1"

This error typically arises when there is a conflict between different Java versions installed on your system.

Understanding JDK and JRE

In older Java versions, the Java Development Kit (JDK) included both the Java Runtime Environment (JRE) and the necessary tools for development, such as compilers. However, with Java 12 and later, you can install both the JRE and the JDK independently.

The Root Cause of the Error

The error you encounter is because your program is trying to compile with Java 12 (as indicated by "javac -version") while attempting to run with Java 8 (as indicated by "java -version"). This version mismatch causes the JNI error.

Solution: Uninstalling Conflicting Java Versions

To resolve the issue, you need to ensure that your system only has one version of Java installed. Here are the steps to follow:

1. Uninstall Java 8 JRE: Go to Control Panel > Programs > Programs and Features. Look for "Java 8 Runtime Environment" and uninstall it.
2. Confirm Consistent Java Versions: Open a command prompt and type "java -version" and "javac -version." Both commands should return the same version number, which should be Java 12 or later.
3. Recompile and Run: Once you have a consistent Java environment, recompile your program and try running it again. The error should be resolved.

Additional Tips

• Ensure that your Eclipse installation is up-to-date and compatible with the Java version you are using.
• Check the environmental variables JAVA_HOME and PATH to make sure they correctly point to the correct Java installation.
• If you continue to encounter errors, consider creating a new workspace in Eclipse to rule out any potential configuration issues.

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