how to show exception message to the user?

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how to show exception message to the user? when task because of an error stops I want to show an error message

someone could help me, thanks.

for example this is the implementation of my connector:

        protected void executeBusinessLogic() throws ConnectorException{
                //Get access to the connector input parameters
                //getPath();
       
                //TODO execute your business logic here
       
                //WARNING : Set the output of the connector execution. If outputs are not set, connector fails
                //setStatus(status);
                //setMensaje(mensaje);         
                try {
                        File file = new File(getPath());
                        InputStream is = new FileInputStream("D:\\Doc.docx");
                        OutputStream out = new FileOutputStream(file);
                        IOUtils.copy(is, out);
                        setStatus(true);               
                       
                } catch (final Exception e) {
                        // TODO Auto-generated catch block
                        setMensaje(e.getMessage());
                        e.printStackTrace();   
                }      
         }
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