Why Does My Java Program Fail with a JNI Error Due to JDK and JRE Version Mismatch?

Unable to Run Java Program Due to Conflicting JDK and JRE

The error message "A JNI error has occurred. Please check your installation and try again in Eclipse x86 Windows 8.1" can occur when there is a mismatch between the Java Development Kit (JDK) and Java Runtime Environment (JRE) versions used to compile and run a program.

In the code provided, the issue could be due to the presence of both JDK 12 and JRE 8 on the system. When the program is compiled, the JDK's Java compiler is used, but when it is run, the JRE's Java Virtual Machine (JVM) is employed. This version mismatch can cause JNI (Java Native Interface) errors.

To resolve this issue, ensure that the same version of the JDK is used for both compiling and running the program. Following these steps may help:

1. Uninstall Conflicting JRE: Uninstall the Java 8 JRE from your computer.

2. Verify JDK Version: Open a command prompt and run the commands:

   • java -version: This should return the version of the Java Runtime Environment used by the system.
   • javac -version: This should return the version of the Java compiler used to compile Java source code.

   Both commands should return the same version of JDK 12.

3. Recompile and Run Program: Recompile the program using the javac command and run it using the java command. The program should run without any version mismatch errors.

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