refactor: Moved exceptions into package `exceptions` - Aligned Code

[demos/kafka/chat] / src / main / java / de / juplo / kafka / chat / backend / domain / exceptions / InvalidUsernameException.java

package de.juplo.kafka.chat.backend.domain.exceptions;

import lombok.Getter;


public class InvalidUsernameException extends RuntimeException
{
  @Getter
  private final String username;

  public InvalidUsernameException(String username)
  {
    super("Invalid username: " + username);
    this.username = username;
  }
}