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Event - User action

Event rule „User action“: interface, context and an example – how to react to this Nuclos event.

REFERENZ DEVELOPER UPDATED: JUL 2026 APPLIES TO NUCLOS 4.2026.X

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When does the rule fire?

This server-side rule runs when a button in the layout is clicked. It can be assigned to a business object.

Structure

Skeleton of the rule class (the rule editor creates it automatically):

package org.nuclet.lager; 

import org.nuclos.api.rule.CustomRule; 
import org.nuclos.api.context.CustomContext; 
import org.nuclos.api.annotation.Rule; 
import org.nuclos.api.exception.BusinessException; 

/** @name        
  * @description 
  * @usage       
  * @change      
*/

@Rule(name="Benutzeraktion Lager", description="Benutzeraktion Lager")
public class BenutzeraktionLager implements CustomRule {
   
    public void custom(CustomContext context) throws BusinessException { 
    }
}

Context: CustomContext

The context CustomContext provides the affected BusinessObject via context.getBusinessObject(...); the RuleContext functions (providers) are also available. A BusinessException aborts the operation.

Assignment

Assign it to the target via drag-and-drop in the server rule manager. Optionally restrict execution to a status or an action; control the order with the arrow buttons.

Example

package org.nuclet.company; 

import org.nuclos.api.rule.CustomRule; 
import org.nuclos.api.context.CustomContext; 
import org.nuclos.api.annotation.Rule; 
import org.nuclos.api.exception.BusinessException; 
import org.nuclos.api.provider.BusinessObjectProvider;
/** @name        
  * @description 
  * @usage       
  * @change      
*/
@Rule(name="Bestellungpuefen", description="Bestellungpuefen")
public class Bestellungpuefen implements CustomRule {
    public void custom(CustomContext context) throws BusinessException { 
    
        Bestellung b = context.getBusinessObject(Bestellung.class);
        
        if (b.getBestellungsposition().size() <= 0) {
            b.setKurzbeschreibung("Nicht vollständig");
        }
        else {
            b.setKurzbeschreibung("Vollständig!");
        }
    }
}