public static String getSystemParameter(SystemParameter parameter) throws BusinessException;

package org.nuclet.businessentity; 
 
import org.nuclos.api.annotation.Rule;
import org.nuclos.api.context.UpdateContext;
import org.nuclos.api.exception.BusinessException;
import org.nuclos.api.provider.ParameterProvider;
import org.nuclos.api.rule.UpdateRule;
import org.nuclos.parameter.NuclosSystemParameter;
 
/** @name       
  * @description
  * @usage      
  * @change     
*/
@Rule(name="SendConfirmationEmail", description="SendConfirmationEmail")
public class SendConfirmationEmail implements UpdateRule {
    public void update(UpdateContext context) throws BusinessException {
     
       Auftrag a = context.getBusinessObject(Auftrag.class);
 
       if(a.isApproved()) {
           String useEmail = ParameterProvider.getSystemParameter(NuclosSystemParameter.ConfirmationEmailIsActive);
           
		   // First check, if the value of this parameter is not null
           if (useEmail != null) {
                if (usrEmail.equals("Y")) {
                    // Following method creates a NuclosEmail and sends it to the user mentioned in "Auftrag" a.
                    // For lack of space this method is not implemented in this example. Suppose it does exist.
                    sendConfirmationEmail(a);
                }
           }       
       }
    }
}

public static String getNucletParameter(NucletParameter parameter) throws BusinessException;

package org.nuclet.zahlungsverkehr; 

import org.nuclos.api.annotation.Rule;
import org.nuclos.api.context.UpdateContext;
import org.nuclos.api.exception.BusinessException;
import org.nuclos.api.provider.ParameterProvider;
import org.nuclos.api.rule.UpdateRule;

import org.nuclet.zahlungsverkehr.ZahlungsverkehrNucletParameter;

/** @name        
  * @description 
  * @usage       
  * @change      
*/
@Rule(name="ValidatePayment", description="ValidatePayment")
public class ValidatePayment implements UpdateRule {
    public void update(UpdateContext context) throws BusinessException {
    
		// Dateiverzeichnis für den Eingang von MT940-Dateien
        String dirMT940Files = ParameterProvider.getNucletParameter(ZahlungsverkehrNucletParameter.MT940_DIRECTORY);
        
    }
}