I unlocked the apex super badge, but In its very first step, I got stuck. I am not able to complete the very first step. I have created a trigger and helper and I have tested the flow by myself all works well. But still, I am getting below error in trailhead.

I have created a trigger on the case.

trigger GenerateMaintenanceCase on Case (before update) {
        ITriggerManager trgrManager = new CaseTriggerHandler();
        TriggerHandler.InvoceHandler(trgrManager);
}

below is the Case trigger handler


public class CaseTriggerHandler implements ITriggerManager{
    
    
    public void onBeforeInsert(List<sObject> newObjLst,Map<Id,sObject> newObjMap){ }
    
    public void onBeforeUpdate(List<sObject> newObj,List<sObject> oldObj,Map<Id,sObject> newMap, Map<Id,sObject> oldMap){
        List<Case> lstOfNewCase = (List<Case>) newObj;
        
        
        List<Case> lstOfCaseToProcess = new List<Case>();
        List<Case> lstOfCaseGetCreated = new List<Case>(); 
        
        for(Case newCase:lstOfNewCase){
            if(''+oldMap.get(newCase.Id).get('Status') != ''+newMap.get(newCase.Id).get('Status') && newMap.get(newCase.Id).get('Status') =='Closed'){
                 lstOfCaseToProcess.add(newCase);
            }
        }
        
        Map<Id,Integer> mapOfLowestWODate = new Map<Id,Integer>();
        if(lstOfCaseToProcess!=null && lstOfCaseToProcess.size()>0 ){
             List<Case> lstOfCase = [SELECT id,Date_Due__c, Vehicle__c,Equipment__c,
                                    (SELECT id,Equipment__r.Maintenance_Cycle__c FROM Work_Parts__r) 
                                     FROM Case 
                                     WHERE Id 
                                     IN :lstOfCaseToProcess];
                                     
             for(Case caseToUpdate: lstOfCase){
                Integer lowest =0;
                for(Work_Part__c workPart: caseToUpdate.Work_Parts__r){
                    if(lowest==0 || lowest>workPart.Equipment__r.Maintenance_Cycle__c){
                       lowest = Integer.valueOf(workPart.Equipment__r.Maintenance_Cycle__c!=null?workPart.Equipment__r.Maintenance_Cycle__c:0);  
                    }
                }
                mapOfLowestWODate.put(caseToUpdate.Id,lowest); 
                Case myCase = new Case();
                //myCase.recordTypeId = mapOfRecordTypeNameToId.get('Routine Maintenance');
                myCase.Type ='Routine Maintenance';
                myCase.subject='As a part of maintenance request';
                myCase.Vehicle__c = caseToUpdate.Vehicle__c;
                myCase.Equipment__c = caseToUpdate.Equipment__c;
                myCase.Date_Reported__c = System.today();
                myCase.Date_Due__c= System.Today()+lowest;
                lstOfCaseGetCreated.add(myCase);
             }
         }
        if(lstOfCaseGetCreated!=null && lstOfCaseGetCreated.size()>0 ){
            insert lstOfCaseGetCreated;
        }
        
    }
    
    public void onAfterInsert(List<sObject> newObj,Map<Id,sObject> newObjMap){}
    
    public void onAfterUpdate(List<sObject> newObj,List<sObject> oldObj,Map<Id,sObject> newMap, Map<Id,sObject> oldMap){}

}

below is the trigger handler

Public class TriggerHandler{

    public static void InvoceHandler(ITriggerManager TriggerMng){
        
        if(Trigger.isBefore){
            
            if(Trigger.isInsert){
                TriggerMng.onBeforeInsert(Trigger.new,Trigger.newMap);
            }
            
            if(Trigger.isUpdate){
               TriggerMng.onBeforeUpdate(Trigger.new,Trigger.old,Trigger.newMap,Trigger.oldMap);                
            }
        }
        if(Trigger.isAfter){
            if(Trigger.isInsert){
                TriggerMng.onAfterInsert(Trigger.new,Trigger.newMap);
            }
            
            if(Trigger.isUpdate){
               TriggerMng.onAfterUpdate(Trigger.new,Trigger.old,Trigger.newMap,Trigger.oldMap);                
            }
        }
    }
}

ITriggerManager  is my interface:

public interface ITriggerManager{
    void onBeforeInsert(List<sObject> newObjLst,Map<Id,sObject> newObjMap);
    void onBeforeUpdate(List<sObject> newObj,List<sObject> oldObj,Map<Id,sObject> newMap, Map<Id,sObject> oldMap);
    void onAfterInsert(List<sObject> newObj,Map<Id,sObject> newObjMap);
    void onAfterUpdate(List<sObject> newObj,List<sObject> oldObj,Map<Id,sObject> newMap, Map<Id,sObject> oldMap);
}


Please help to understand this error and plz let me know if there is an issue with my code.

Thanks,
 

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Hi,

My requirement is to create ApexTrigger in Salesforce dynamically after taking the required inputs from the user.

Is it possible using the SOAP API "create" operation since ApexClass and ApexTrigger are standard objects in Salesforce, 

Regards
Shalindra Singh