Why am I getting a 'NoClassDefFoundError: wrong name' in my Java Program?

NoClassDefFoundError: Wrong Class Name Resolution

When compiling Java programs, encountering a "NoClassDefFoundError: wrong name" exception can be frustrating. This error occurs when the Java Virtual Machine (JVM) cannot find the specified class definition during runtime.

The error message provides a hint: "wrong name: clientrest/ClientREST". This indicates that the JVM is expecting the class to be in a specific package, but it's being invoked incorrectly.

To resolve this issue, consider the following recommendations:

1. Verify Package Name: Ensure that the package name provided in the exception message matches the actual package of the class. Pay attention to casing and directory structure.
2. Execute from Package Root: When executing the .class file, navigate to the package root directory where the package folder containing the class resides. Run the class from there using the fully qualified name: "java packagename.classname".
3. Avoid Subdirectory Invocation: Instead of executing the class within the package subdirectory, move up one level to the package root directory and run the class from there.

By following these steps, you can correct the class resolution and avoid the "wrong name" error.

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