package ch03;import javax.servlet.http.HttpServletRequest;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionMapping;import org.apache.struts.action.ActionError;import org.apache.struts.action.ActionErrors;public class LookupForm extends ActionForm {  private String symbol = null;  public String getSymbol() {    return (symbol);  }  public void setSymbol(String symbol) {    this.symbol = symbol;  }  public void reset(ActionMapping mapping,    HttpServletRequest request) {    this.symbol = null;  }  public ActionErrors validate(ActionMapping mapping,    HttpServletRequest request) {    ActionErrors errors = new ActionErrors();    if ( (symbol == null ) || (symbol.length() == 0) ) {      errors.add("symbol",        new ActionError("errors.lookup.symbol.required"));    }    return errors;  }}