Handling Errors

Java Platform, Enterprise Edition (Java EE) 8
The Java EE Tutorial

Handling Errors

To designate a method that handles errors in an annotated WebSocket endpoint, decorate it with @OnError:

@ServerEndpoint("/testendpoint")
public class TestEndpoint {
   ...
   @OnError
   public void error(Session session, Throwable t) {
      t.printStackTrace();
      ...
   }
}

This method is invoked when there are connection problems, runtime errors from message handlers, or conversion errors when decoding messages.

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