Why am I getting the \"Unable to access JAR file\" error when running my program?

Unable to Access JARFile Error: Investigating its Causes

When attempting to run a program outside of an IDE, encountering the "Unable to access jarfile" error can be frustrating. This issue arises when double-clicking an executable JAR file fails to launch the program, leaving you with a cryptic error message in the command prompt.

Root Cause:

The error originates from an incorrect command format when using the java -jar command. Typically, when creating an executable JAR file using an IDE, it involves specifying the Main class and creating an Export Destination. However, missing the JAR file extension in the java -jar command is often the culprit.

Solution:

To resolve this issue, ensure you are specifying the complete path to your JAR file, including the .jar extension in the java -jar command. For instance, instead of using java -jar TestJar as in the example given, you should modify it to java -jar TestJar.jar.

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