package electric.dbs;import java.io.*;public class SellNotFoundException    extends Exception {  private Throwable nestedThrowable = null;  public SellNotFoundException() {    super();  }  public SellNotFoundException(String msg) {    super(msg);  }  public SellNotFoundException(Throwable nestedThrowable) {    this.nestedThrowable = nestedThrowable;  }  public SellNotFoundException(String msg, Throwable nestedThrowable) {    super(msg);    this.nestedThrowable = nestedThrowable;  }  public void printStackTrace() {    super.printStackTrace();    if (nestedThrowable != null) {      nestedThrowable.printStackTrace();    }  }  public void printStackTrace(PrintStream ps) {    super.printStackTrace(ps);    if (nestedThrowable != null) {      nestedThrowable.printStackTrace(ps);    }  }  public void printStackTrace(PrintWriter pw) {    super.printStackTrace(pw);    if (nestedThrowable != null) {      nestedThrowable.printStackTrace(pw);    }  }}