Why Am I Getting a 'NoClassDefFoundError: wrong name' in Java?

"NoClassDefFoundError: wrong name" Explained

Problem:

A Java program compiled using NetBeans encounters a "NoClassDefFoundError: wrong name" exception when attempting to run the generated .class file. The class name and path appear correct, causing confusion.

Answer:

The exception originates from two key pieces of information:

1. "Exception in thread 'main' java.lang.NoClassDefFoundError: ClientREST" - The exception indicates that the main class ClientREST is not found. This suggests that the program was run with the command "java ClientREST," which assumes the existence of a ClientREST.class file in the root directory.
2. "(wrong name: clientrest/ClientREST)" - This message indicates that the class resides within a package named "clientrest."

Solution:

To resolve the error, it is necessary to run the program from the root directory of the package. Instead of running "java ClientREST," navigate to the parent folder containing the "clientrest" package and run "java clientrest.ClientREST." This command specifies the correct path to the class within the package, eliminating the "wrong name" error.

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