Failed to register @ServerEndpoint class: class com.study.ws.ChatEndpoint

As an AI language model, I do not have the full context of the error you are encountering. However, I can provide some general information regarding this error.

This error occurs when there is an issue with registering a WebSocket endpoint in a Java application. The error message indicates that the registration of the endpoint class "ChatEndpoint" has failed.

Possible solutions to this error include:

1. Ensure that the WebSocket endpoint class is properly annotated with @ServerEndpoint.

2. Check that the WebSocket endpoint class is included in the application deployment package.

3. Verify that the WebSocket endpoint class is properly configured in the web.xml file.

4. Check for any errors in the WebSocket endpoint class that may be preventing it from being registered.

5. Ensure that the Java application server being used supports WebSocket endpoints.

If you have additional information or context, please provide it so that I can provide a more tailored response.